subject:(hydraulic conductivity)

University of Hawaii – Manoa

1. Ripple, James K. A study of the effects of confinement, soil parameters, and testing methods on the hydraulic conductivity of some finegrained soils on Oahu.

Degree: 2016, University of Hawaii – Manoa

URL: http://hdl.handle.net/10125/101434

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M.S. University of Hawaii at Manoa 2011.

The purpose of this study is to measure with research laboratory accuracy, the hydraulic conductivity of soils sampled… (more)

Subjects/Keywords: hydraulic conductivity

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APA (6^th Edition):

Ripple, J. K. (2016). A study of the effects of confinement, soil parameters, and testing methods on the hydraulic conductivity of some finegrained soils on Oahu. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/101434

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ripple, James K. “A study of the effects of confinement, soil parameters, and testing methods on the hydraulic conductivity of some finegrained soils on Oahu.” 2016. Thesis, University of Hawaii – Manoa. Accessed January 27, 2020. http://hdl.handle.net/10125/101434.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ripple, James K. “A study of the effects of confinement, soil parameters, and testing methods on the hydraulic conductivity of some finegrained soils on Oahu.” 2016. Web. 27 Jan 2020.

Vancouver:

Ripple JK. A study of the effects of confinement, soil parameters, and testing methods on the hydraulic conductivity of some finegrained soils on Oahu. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10125/101434.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ripple JK. A study of the effects of confinement, soil parameters, and testing methods on the hydraulic conductivity of some finegrained soils on Oahu. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/101434

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

2. Wubbels, Jane. Tree species distribution in relation to stem hydraulic traits and soil moisture in a mixed hardwood forest in central Pennsylvania.

Degree: MS, Horticulture, 2010, Penn State University

URL: https://etda.libraries.psu.edu/catalog/10712

► The hydraulic architecture of a tree could contribute to its ability to tolerate drier soils by increasing resistance to xylem cavitation and improving the efficiency… (more)

Subjects/Keywords: hydraulic architecture; xylem vulnerability; conductivity

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APA (6^th Edition):

Wubbels, J. (2010). Tree species distribution in relation to stem hydraulic traits and soil moisture in a mixed hardwood forest in central Pennsylvania. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/10712

Chicago Manual of Style (16^th Edition):

Wubbels, Jane. “Tree species distribution in relation to stem hydraulic traits and soil moisture in a mixed hardwood forest in central Pennsylvania.” 2010. Masters Thesis, Penn State University. Accessed January 27, 2020. https://etda.libraries.psu.edu/catalog/10712.

MLA Handbook (7^th Edition):

Wubbels, Jane. “Tree species distribution in relation to stem hydraulic traits and soil moisture in a mixed hardwood forest in central Pennsylvania.” 2010. Web. 27 Jan 2020.

Vancouver:

Wubbels J. Tree species distribution in relation to stem hydraulic traits and soil moisture in a mixed hardwood forest in central Pennsylvania. [Internet] [Masters thesis]. Penn State University; 2010. [cited 2020 Jan 27]. Available from: https://etda.libraries.psu.edu/catalog/10712.

Council of Science Editors:

Wubbels J. Tree species distribution in relation to stem hydraulic traits and soil moisture in a mixed hardwood forest in central Pennsylvania. [Masters Thesis]. Penn State University; 2010. Available from: https://etda.libraries.psu.edu/catalog/10712

Boise State University

3. Johnson, Brady Allen. Evapotranspiration in the Riparian Zone of the Lower Boise River with Implications for Groundwater Flow.

Degree: 2011, Boise State University

URL: https://scholarworks.boisestate.edu/td/168

► Riparian zones in semi-arid regions often exhibit high rates of evapotranspiration (ET) in spite of low soil moisture content due to vegetation that is able… (more)

▼ Riparian zones in semi-arid regions often exhibit high rates of evapotranspiration (ET) in spite of low soil moisture content due to vegetation that is able to withdraw water from shallow aquifers. This work better defines the relationship between ET and the saturated zone by comparing the observed water table drawdown to analytically modeled drawdown in fully penetrating wells of an unconfined aquifer in response to daily ET flux. ET at the Boise Hydrogeophysical Research Site or BHRS (a riparian zone in a temperate, semi arid environment) is calculated following the approach of Batra et al. (2006) but uses site (or near site) measurements for air temperature and net radiation while relying on Landsat 5 data for quantification of vegetation. The resulting ET calculations represent a data set consisting of high resolution (30m x 30m) ET flux values obtained from minimal site measurements. Water table levels in the shallow, unconfined aquifer were monitored over the summer and fall of 2009 to record the timing and magnitude of daily fluctuations in four wells with different vegetation densities and distances from the nearby Boise River at the site. ET derived from the radiation-driven model of Batra et al. (2006) compares favorably with groundwater ET contribution rates calculated from well hydrographs (White, 1932), which further supports the finding of negligible water contribution coming from the unsaturated zone in shallow riparian aquifers in semi-arid regions (Shah et al., 2007). Using an analytical solution to ET induced drawdown (Malama & Johnson, 2010) for a semi-infinite (or river bounded) domain, daily drawdown is modeled in response to daily ET flux applied at the water table. Close agreement between observed and modeled drawdown supports the idea that ET can be estimated from well hydrographs in a wellcharacterized aquifer and conversely, if ET behavior is characterized, aquifer parameters like hydraulic conductivity and specific storage can be estimated from well hydrographs.

Subjects/Keywords: Evapotranspiration; Phreatophytes; Hydraulic Conductivity; Geology

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APA (6^th Edition):

Johnson, B. A. (2011). Evapotranspiration in the Riparian Zone of the Lower Boise River with Implications for Groundwater Flow. (Thesis). Boise State University. Retrieved from https://scholarworks.boisestate.edu/td/168

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Johnson, Brady Allen. “Evapotranspiration in the Riparian Zone of the Lower Boise River with Implications for Groundwater Flow.” 2011. Thesis, Boise State University. Accessed January 27, 2020. https://scholarworks.boisestate.edu/td/168.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Johnson, Brady Allen. “Evapotranspiration in the Riparian Zone of the Lower Boise River with Implications for Groundwater Flow.” 2011. Web. 27 Jan 2020.

Vancouver:

Johnson BA. Evapotranspiration in the Riparian Zone of the Lower Boise River with Implications for Groundwater Flow. [Internet] [Thesis]. Boise State University; 2011. [cited 2020 Jan 27]. Available from: https://scholarworks.boisestate.edu/td/168.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Johnson BA. Evapotranspiration in the Riparian Zone of the Lower Boise River with Implications for Groundwater Flow. [Thesis]. Boise State University; 2011. Available from: https://scholarworks.boisestate.edu/td/168

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cornell University

4. Smith, Maria. Linking Stem And Leaf Traits To Leaf Phenology In Native And Non-Native Woody Plants Of Eastern Deciduous Forests .

Degree: 2014, Cornell University

URL: http://hdl.handle.net/1813/36134

► Non-native woody plants pose significant threats to biodiversity, and thus ecosystem goods and services. Many non-natives exhibit suites of traits such as higher productivity, which… (more)

Subjects/Keywords: phenology; root dynamics; hydraulic conductivity

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APA (6^th Edition):

Smith, M. (2014). Linking Stem And Leaf Traits To Leaf Phenology In Native And Non-Native Woody Plants Of Eastern Deciduous Forests . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/36134

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Smith, Maria. “Linking Stem And Leaf Traits To Leaf Phenology In Native And Non-Native Woody Plants Of Eastern Deciduous Forests .” 2014. Thesis, Cornell University. Accessed January 27, 2020. http://hdl.handle.net/1813/36134.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smith, Maria. “Linking Stem And Leaf Traits To Leaf Phenology In Native And Non-Native Woody Plants Of Eastern Deciduous Forests .” 2014. Web. 27 Jan 2020.

Vancouver:

Smith M. Linking Stem And Leaf Traits To Leaf Phenology In Native And Non-Native Woody Plants Of Eastern Deciduous Forests . [Internet] [Thesis]. Cornell University; 2014. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/1813/36134.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smith M. Linking Stem And Leaf Traits To Leaf Phenology In Native And Non-Native Woody Plants Of Eastern Deciduous Forests . [Thesis]. Cornell University; 2014. Available from: http://hdl.handle.net/1813/36134

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

5. Abdelmohsen, Shahynaz. EQUIVALENT FRESHWATER MODELS FOR COASTAL AQUIFERS.

Degree: MASc (Master of Applied Science/Maîtrise ès sciences appliquées), Civil Engineering/Génie civil, 2014, Royal Military College of Canada

URL: http://hdl.handle.net/11264/143

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The aim of this study was to investigate the impact of saltwater intrusion on the transient hydraulic behavior of coastal aquifers and to develop an… (more)

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The aim of this study was to investigate the impact of saltwater intrusion on the transient hydraulic behavior of coastal aquifers and to develop an Equivalent Freshwater Modeling (EFM) approach. The EFM approach proposed here focuses on the use of an Equivalent Freshwater Hydraulic Conductivity. A two dimensional finite difference saltwater/freshwater model was developed using SEAWAT. An equivalent two dimensional freshwater-only model was also developed using MODFLOW. Both saltwater/freshwater and freshwater-only models were run under different recharge and pumping conditions. A comparison between the two models’ behaviour was held to identify possible relationships between the hydraulic conductivity (Ks) of the saltwater/freshwater model and the hydraulic conductivity (Kf) of the freshwater-only model. For each value of Ks a calibration exercise was performed to choose the equivalent Kf value that gives the minimum Root Mean Square Error between the two models. Plots of the relationship between Ks and the optimal Kf values were generated for a range of Ks values and for a range of pumping conditions represented by the ratio of pumping rate over the freshwater lens thickness, (Q/Bf). The optimal Kf values were then tested with three dimensional models. From the different simulation scenarios we found that the presence of saltwater intrusion does not significantly affect the behavior of fine sand aquifers (Ks < 5 m/d), under the full range of pumping and freshwater lens thicknesses considered in this study. In medium sand aquifers (10 < Ks < 25 m/day), the presence of the intrusion requires an Equivalent Freshwater Hydraulic Conductivity (Kf) that is 20 to 30% higher than the original value, but the required Kf is fairly independent of the pumping over the freshwater lens thickness ratio (Q/Bf) In coarse sand aquifers (Ks > 45 m/day), the saltwater presence does have a significant effect on the aquifer behavior and the ratio of Kf over Ks is significantly affected by the freshwater lens thickness and the pumping rate. The 3-D model verifications, that were performed with Fine Sand and Medium Sand Hydraulic Conductivities only, confirmed the Kf /Ks relationships that were developed with the 2-D models. The performance of the EFM approach was found to depend on the aquifer hydraulic conductivity, the freshwater lens thickness and the intensity of the pumping applied to the models.

Le but de cette étude était d’investiguer l’impact des intrusions salines sur le comportement hydraulique transitoire des aquifères côtiers et de développer une approche de Modélisation Équivalente d’Eaux Douces (MEED). L’approche MEED proposée ici, est axée sur l’utilisation d’une Conductivité Hydraulique d’Eau Douce Équivalente. Un modèle bidimensionnel eaux salines / eaux fraiches en différence finies a été développé à l’aide de SEAWAT. Un modèle bidimensionnel eaux fraiches équivalent a aussi été développé avec MODFLOW. Les deux modèles ont été exécutés sous différentes conditions de recharge et de pompage. Une comparaison…

Advisors/Committee Members: Royal Military College of Canada / Collège militaire royal du Canada, Tetreault, Michel, Hulley, Michael.

Subjects/Keywords: Coastal aquifer; Saltwater Hydraulic Conductivity; Equivalent Freshwater Hydraulic Conductivity; SEAWAT

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APA (6^th Edition):

Abdelmohsen, S. (2014). EQUIVALENT FRESHWATER MODELS FOR COASTAL AQUIFERS. (Masters Thesis). Royal Military College of Canada. Retrieved from http://hdl.handle.net/11264/143

Chicago Manual of Style (16^th Edition):

Abdelmohsen, Shahynaz. “EQUIVALENT FRESHWATER MODELS FOR COASTAL AQUIFERS.” 2014. Masters Thesis, Royal Military College of Canada. Accessed January 27, 2020. http://hdl.handle.net/11264/143.

MLA Handbook (7^th Edition):

Abdelmohsen, Shahynaz. “EQUIVALENT FRESHWATER MODELS FOR COASTAL AQUIFERS.” 2014. Web. 27 Jan 2020.

Vancouver:

Abdelmohsen S. EQUIVALENT FRESHWATER MODELS FOR COASTAL AQUIFERS. [Internet] [Masters thesis]. Royal Military College of Canada; 2014. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/11264/143.

Council of Science Editors:

Abdelmohsen S. EQUIVALENT FRESHWATER MODELS FOR COASTAL AQUIFERS. [Masters Thesis]. Royal Military College of Canada; 2014. Available from: http://hdl.handle.net/11264/143

University of Georgia

6. Abreu, Maria Eugenia. Permeability estimates for soils in the southern piedmont of Georgia.

Degree: MS, Agronomy, 2005, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/abreu_maria_e_200512_ms

► A combination of different characteristics may affect the permeability behavior of a soil. Saturated hydraulic conductivity or permeability (Ks) was measured in situ at five… (more)

Subjects/Keywords: saturated hydraulic conductivity

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APA (6^th Edition):

Abreu, M. E. (2005). Permeability estimates for soils in the southern piedmont of Georgia. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/abreu_maria_e_200512_ms

Chicago Manual of Style (16^th Edition):

Abreu, Maria Eugenia. “Permeability estimates for soils in the southern piedmont of Georgia.” 2005. Masters Thesis, University of Georgia. Accessed January 27, 2020. http://purl.galileo.usg.edu/uga_etd/abreu_maria_e_200512_ms.

MLA Handbook (7^th Edition):

Abreu, Maria Eugenia. “Permeability estimates for soils in the southern piedmont of Georgia.” 2005. Web. 27 Jan 2020.

Vancouver:

Abreu ME. Permeability estimates for soils in the southern piedmont of Georgia. [Internet] [Masters thesis]. University of Georgia; 2005. [cited 2020 Jan 27]. Available from: http://purl.galileo.usg.edu/uga_etd/abreu_maria_e_200512_ms.

Council of Science Editors:

Abreu ME. Permeability estimates for soils in the southern piedmont of Georgia. [Masters Thesis]. University of Georgia; 2005. Available from: http://purl.galileo.usg.edu/uga_etd/abreu_maria_e_200512_ms

Texas A&M University

7. Jansen, Timothy A. The Effect of Rock Properties on Hydraulic Fracture Conductivity in the Eagle Ford and Fayetteville Shales.

Degree: 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/153882

► Hydraulic fracture treatments are used in low permeability shale reservoirs in order to provide highly conductive pathways from the reservoir to the wellbore. The success… (more)

▼ Hydraulic fracture treatments are used in low permeability shale reservoirs in order to provide highly conductive pathways from the reservoir to the wellbore. The success of these treatments is highly reliant on the created fracture conductivity. Optimizing fracture designs to improve well performance requires knowledge of how fracture conductivity is affected by rock and proppant characteristics. This study investigates the relationship between rock characteristics and laboratory measurements of propped and unpropped fracture conductivity of outcrop samples. These samples are from the Eagle Ford shale and the Fayetteville shale. Triaxial compression tests were performed on core specimens in order to determine the Young?s Modulus and Poisson?s Ratio of the outcrop samples. A combination of X-ray diffraction and Fourier transform infrared spectroscopy was used to determine the mineralogy. Profilometer surface scans were also performed to characterize the fracture topography. The results from this study show that the main factors affecting fracture conductivity are closure stress and proppant characteristics (concentration, size, and strength). For unpropped fractures, the fracture topography is the main factor in determining fracture conductivity. The topography interaction of the two surfaces determines the fracture width. A higher Young?s Modulus helps maintain this fracture width by resisting deformation as closure stress increases. For propped fractures, the most influential factor in determining fracture conductivity is proppant characteristics (concentration, size, and strength). At a proppant monolayer placement, the major mechanism for conductivity loss is proppant embedment, leading to decreased fracture width. A higher Young?s Modulus reduces the proppant embedment and better maintains fracture conductivity as closure stress increases. For a multilayer proppant pack concentration, the effect of rock characteristics is negligible compared to the effect of proppant pack characteristics. Advisors/Committee Members: Zhu, Ding (advisor), Hill, A. Daniel (committee member), Chester, Fredrick M (committee member).

Subjects/Keywords: Fracture Conductivity; Eagle Ford; Fayetteville; Hydraulic Fracturing

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APA (6^th Edition):

Jansen, T. A. (2014). The Effect of Rock Properties on Hydraulic Fracture Conductivity in the Eagle Ford and Fayetteville Shales. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153882

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jansen, Timothy A. “The Effect of Rock Properties on Hydraulic Fracture Conductivity in the Eagle Ford and Fayetteville Shales.” 2014. Thesis, Texas A&M University. Accessed January 27, 2020. http://hdl.handle.net/1969.1/153882.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jansen, Timothy A. “The Effect of Rock Properties on Hydraulic Fracture Conductivity in the Eagle Ford and Fayetteville Shales.” 2014. Web. 27 Jan 2020.

Vancouver:

Jansen TA. The Effect of Rock Properties on Hydraulic Fracture Conductivity in the Eagle Ford and Fayetteville Shales. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/1969.1/153882.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jansen TA. The Effect of Rock Properties on Hydraulic Fracture Conductivity in the Eagle Ford and Fayetteville Shales. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153882

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

California State University – Sacramento

8. Leikam, Dennis E. Variability of hydraulic conductivity in a complex aquifer system, California Coast Range foothills, San Joaquin County, California.

Degree: MS, Geology, 2010, California State University – Sacramento

URL: http://hdl.handle.net/10211.9/148

► Single well slug tests measured hydraulic conductivity of twenty two wells at an industrial food processing facility, covering approximately 300-acres. Boring logs were studied to… (more)

Subjects/Keywords: Hydraulic conductivity; Coast ranges; Complex aquifer

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APA (6^th Edition):

Leikam, D. E. (2010). Variability of hydraulic conductivity in a complex aquifer system, California Coast Range foothills, San Joaquin County, California. (Masters Thesis). California State University – Sacramento. Retrieved from http://hdl.handle.net/10211.9/148

Chicago Manual of Style (16^th Edition):

Leikam, Dennis E. “Variability of hydraulic conductivity in a complex aquifer system, California Coast Range foothills, San Joaquin County, California.” 2010. Masters Thesis, California State University – Sacramento. Accessed January 27, 2020. http://hdl.handle.net/10211.9/148.

MLA Handbook (7^th Edition):

Leikam, Dennis E. “Variability of hydraulic conductivity in a complex aquifer system, California Coast Range foothills, San Joaquin County, California.” 2010. Web. 27 Jan 2020.

Vancouver:

Leikam DE. Variability of hydraulic conductivity in a complex aquifer system, California Coast Range foothills, San Joaquin County, California. [Internet] [Masters thesis]. California State University – Sacramento; 2010. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10211.9/148.

Council of Science Editors:

Leikam DE. Variability of hydraulic conductivity in a complex aquifer system, California Coast Range foothills, San Joaquin County, California. [Masters Thesis]. California State University – Sacramento; 2010. Available from: http://hdl.handle.net/10211.9/148

Penn State University

9. Fitzgerald, Michael Robert. Influence of drainage state on direct-push permeability profiling methods.

Degree: PhD, Energy and Geo-Environmental Engineering, 2009, Penn State University

URL: https://etda.libraries.psu.edu/catalog/9355

► This dissertation is composed of three articles that examine the influence of drainage condition on the measured magnitudes of mechanical and fluid transport properties of… (more)

▼ This dissertation is composed of three articles that examine the influence of drainage condition on the measured magnitudes of mechanical and fluid transport properties of soils obtained using direct-push tools. The two tools that were used within this work are the Hydraulic Profiling Tool (HPT) and the Cone Penetration Test (CPT). The influence of drainage state originates from the coupled soil strain rate, which is prescribed by the penetrometer radius and advance rate along with diffusivity, which controls the induced fluid pressure dissipation rate through the soil, was examined for both instruments through a combination of field and laboratory experiments with numerical and analytical models developed to assist in understanding the resulting data trends. Through out, the analyses were conducted to first evaluate the role of drainage state on the magnitudes of induced fluid pressures and strength magnitudes; then advanced to utilize this information to develop methods for recovering depth-continuous magnitudes of permeability from the data. Detailed abstracts for each article are provided below. Depth-continuous permeability profiling using an active source permeameter: A method is developed to recover a depth-continuous hydraulic conductivity (K) profile of an unconsolidated saturated aquifer using an active source penetrometer, the Hydraulic Profiling Tool (HPT). The tool yields estimates of through continuous injection of fluid in the subsurface from a small port on the probe shaft while controlled measurements of net applied fluid pressure (∆P) required to maintain a specified flow rate (Q) (typically 350 mL/min) are recorded. The tool gathers these data of flow rate and measured applied pressure during halted and constant-rate penetration (typically 2cm/sec) of the probe. The analysis is developed in two parts: first to explore the interplay between advective effects controlled by penetration rate, and second to examine flow volume effects controlled by the targeted flow rate. These two effects are analyzed through their respective influence on the measured applied pressure response in space, which shows a linear relationship for the flow rate to applied pressure response when and when the response tends towards an asymptotic limit representing soil failure limits as ∆P/effective stress. The analysis shows that penetration rate does not significantly influence the applied pressure response at the tested penetration rates (U = 0, 2, 4 cm/s ). The targeted applied flow rate does however influence the applied pressure response as flow rates less than ~300 mL/min show a scattering of the data in space, where above 300 mL/min the data begin to form a linear response. A targeted flow rate of is suggested as a suitable flow rate based on this analysis. Measurements of hydraulic conductivity are then obtained for the HPT data through the derivation of an equation based on a recast form of Darcy’s law where considerations of the flow geometry as . profiles obtained for the HPT system are then compared…

Subjects/Keywords: soils; hydraulic conductivity; permeability; direct-push

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APA (6^th Edition):

Fitzgerald, M. R. (2009). Influence of drainage state on direct-push permeability profiling methods. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/9355

Chicago Manual of Style (16^th Edition):

Fitzgerald, Michael Robert. “Influence of drainage state on direct-push permeability profiling methods.” 2009. Doctoral Dissertation, Penn State University. Accessed January 27, 2020. https://etda.libraries.psu.edu/catalog/9355.

MLA Handbook (7^th Edition):

Fitzgerald, Michael Robert. “Influence of drainage state on direct-push permeability profiling methods.” 2009. Web. 27 Jan 2020.

Vancouver:

Fitzgerald MR. Influence of drainage state on direct-push permeability profiling methods. [Internet] [Doctoral dissertation]. Penn State University; 2009. [cited 2020 Jan 27]. Available from: https://etda.libraries.psu.edu/catalog/9355.

Council of Science Editors:

Fitzgerald MR. Influence of drainage state on direct-push permeability profiling methods. [Doctoral Dissertation]. Penn State University; 2009. Available from: https://etda.libraries.psu.edu/catalog/9355

University of Saskatchewan

10. Li, Gang. Effect of cracks on the transport characteristics of cracked concrete.

Degree: 2014, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2014-04-1525

► Cracks in reinforced concrete structures can occur as a result of many phenomena such as fresh concrete bleeding, restrained shrinkage, thermal gradients, freeze-thaw cycles, alkali-aggregate… (more)

▼ Cracks in reinforced concrete structures can occur as a result of many phenomena such as fresh concrete bleeding, restrained shrinkage, thermal gradients, freeze-thaw cycles, alkali-aggregate reactions, and can also be induced by external loading. Thus, concrete becomes more vulnerable to the processes of deterioration by corrosion of reinforcement. The corrosion rate of cracked reinforced concrete in different exposure conditions has been studied by some researchers. However, it is not clear how the presence of cracks affects the corrosion-determining factors, which control the corrosion pattern at the crack. The objective of this project was to develop an understanding of the effects of cracking on the transport characteristics under wetting and drying cycles. In this project, flexural loading induced natural cracks, and parallel-wall artificial cracks were studied. The infiltration properties of those cracks were evaluated by the tension infiltrometry technique. The saturation conditions around the crack were monitored with the Time Domain Reflectometry (TDR) technique. A numerical simulation was carried out to model the evolution of saturation in the cracked beams; in the model two crack modeling approaches were employed and compared. The infiltration test showed that the presence of both artificial and natural cracks (0.3 mm and 1.0 mm) dramatically increased the permeability of concrete. The value of hydraulic conductivity was increased by up to 5 orders of magnitude at the location of the crack. The evolution of water saturation of the cracked concrete under wetting and drying conditions was analyzed as colour-scaled images and the water saturation contours were compared for different crack openings. For the artificial crack samples, a deviation from the expected “perfectly symmetric” flow regime around a straight crack was observed. This was probably caused by the micro cracks induced during the shim pull-out process or a non-uniform compaction around the shim insertion. For the natural cracks, in the drying phase, smaller cracks seemed to have better water storage. Hence, the water saturation decreased at a slightly slower rate. The crack behaved like an open surface that was exposed to the environment. Application of the same material properties to the open surface and the crack surface did not bring a large error for the water flow simulations. A hysteresis phenomenon has been found during the identification of the Van Genuchten material parameters using an inverse modelling approach, with Ks=5×10-10 m/s, α =4.33×10-4, for the wetting phase, n=1.32 and for the drying phase, n=2.0. The simulation results suggest that for the simple flexural crack, the 1D crack line averaged from the front and back crack lines is capable of representing the crack in the wetting and drying scenario. The crack could be modelled as “free surface” or “equivalent porous medium”. Advisors/Committee Members: Boulfiza, Moh, Wegner, Leon, Feldman, Lisa, Park, Peter.

Subjects/Keywords: Hydraulic conductivity Permeability Cracked concrete TDR

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APA (6^th Edition):

Li, G. (2014). Effect of cracks on the transport characteristics of cracked concrete. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2014-04-1525

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Gang. “Effect of cracks on the transport characteristics of cracked concrete.” 2014. Thesis, University of Saskatchewan. Accessed January 27, 2020. http://hdl.handle.net/10388/ETD-2014-04-1525.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Gang. “Effect of cracks on the transport characteristics of cracked concrete.” 2014. Web. 27 Jan 2020.

Vancouver:

Li G. Effect of cracks on the transport characteristics of cracked concrete. [Internet] [Thesis]. University of Saskatchewan; 2014. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10388/ETD-2014-04-1525.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li G. Effect of cracks on the transport characteristics of cracked concrete. [Thesis]. University of Saskatchewan; 2014. Available from: http://hdl.handle.net/10388/ETD-2014-04-1525

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

11. Cranmer, Elizabeth Nadine. Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont.

Degree: MS, Environmental Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/43872

► As the worldâ s population shifts toward living in cities, urbanization and its deleterious effects on the environment are a cause of increasing concern. The… (more)

Subjects/Keywords: sediment; hydraulic conductivity; hyporheic; stream; urbanization

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APA (6^th Edition):

Cranmer, E. N. (2011). Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/43872

Chicago Manual of Style (16^th Edition):

Cranmer, Elizabeth Nadine. “Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont.” 2011. Masters Thesis, Virginia Tech. Accessed January 27, 2020. http://hdl.handle.net/10919/43872.

MLA Handbook (7^th Edition):

Cranmer, Elizabeth Nadine. “Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont.” 2011. Web. 27 Jan 2020.

Vancouver:

Cranmer EN. Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10919/43872.

Council of Science Editors:

Cranmer EN. Effect of Urbanization on the Hyporheic Zone: Lessons from the Virginia Piedmont. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/43872

University of Wollongong

12. Nguyen, Vo Trong. Flow through filters in embankment dams.

Degree: PhD, 2012, University of Wollongong

URL: 090501 Civil Geotechnical Engineering, 090502 Construction Engineering, 090507 Transport Engineering, 090509 Water Resources Engineering ; https://ro.uow.edu.au/theses/3646

► This thesis presents studies relating to filter and filtration problems, namely time-dependent filtration process of a given combination of base and filter soils, suffusion… (more)

Subjects/Keywords: filtration; suffusion; granular filters; hydraulic conductivity

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APA (6^th Edition):

Nguyen, V. T. (2012). Flow through filters in embankment dams. (Doctoral Dissertation). University of Wollongong. Retrieved from 090501 Civil Geotechnical Engineering, 090502 Construction Engineering, 090507 Transport Engineering, 090509 Water Resources Engineering ; https://ro.uow.edu.au/theses/3646

Chicago Manual of Style (16^th Edition):

Nguyen, Vo Trong. “Flow through filters in embankment dams.” 2012. Doctoral Dissertation, University of Wollongong. Accessed January 27, 2020. 090501 Civil Geotechnical Engineering, 090502 Construction Engineering, 090507 Transport Engineering, 090509 Water Resources Engineering ; https://ro.uow.edu.au/theses/3646.

MLA Handbook (7^th Edition):

Nguyen, Vo Trong. “Flow through filters in embankment dams.” 2012. Web. 27 Jan 2020.

Vancouver:

Nguyen VT. Flow through filters in embankment dams. [Internet] [Doctoral dissertation]. University of Wollongong; 2012. [cited 2020 Jan 27]. Available from: 090501 Civil Geotechnical Engineering, 090502 Construction Engineering, 090507 Transport Engineering, 090509 Water Resources Engineering ; https://ro.uow.edu.au/theses/3646.

Council of Science Editors:

Nguyen VT. Flow through filters in embankment dams. [Doctoral Dissertation]. University of Wollongong; 2012. Available from: 090501 Civil Geotechnical Engineering, 090502 Construction Engineering, 090507 Transport Engineering, 090509 Water Resources Engineering ; https://ro.uow.edu.au/theses/3646

University of Waterloo

13. Ketcheson, Scott James. An evaluation of the water balance and moisture dynamics within Sphagnum mosses following the restoration (rewetting) of an abandoned block-cut bog.

Degree: 2011, University of Waterloo

URL: http://hdl.handle.net/10012/6328

► Artificial drainage networks established throughout peatlands during the peat extraction process often remain active following abandonment, maintaining a water table relatively far from the surface… (more)

▼ Artificial drainage networks established throughout peatlands during the peat extraction process often remain active following abandonment, maintaining a water table relatively far from the surface of the peat and hindering the survival and reestablishment of Sphagnum mosses. Since cutover peatlands are characterized by low (negative) soil water pressures, sufficient internal water storage and balanced water fluxes are critical for the physiological function of spontaneously regenerated Sphagnum mosses. The relative importance of water exchanges between spontaneously regenerated Sphagnum moss cushions and their surroundings are addressed through investigation of the sensitivity of moss moisture dynamics to a range of environmental variables. Precipitation waters are poorly retained within the cushions, which indicated that rain event water can only be relied upon by the mosses for a short period of time. An imbalance between water inputs and losses from moss cushions identified that additional (small) sources of water, such as dewfall and distillation, are potentially important for physiological processes under dry conditions, common in disturbed peatland ecosystems. As an initial restoration effort, rewetting of the peatland by blocking drainage ditches consequently reduced the runoff efficiency and caused the site-average water table to rise by 32 cm. Higher water tables and a blocked drainage network created conditions more favourable for Sphagnum survival through increasing the moisture content and soil-water pressures within the remnant peat deposit. The hydrologic connectivity between moss cushions and the remnant peat was strong when conditions were wet and the water table was within 30 cm of the surface of the cutover peat but weakened as conditions became drier, as reflected by weakened upward hydraulic gradients in the unsaturated zone below the moss cushions. Runoff variability increased following rewetting, and displayed a greater dependence upon antecedent conditions (capacity to retain additional water on-site) and event-based precipitation dynamics. Evapotranspiration rates were 25% higher following rewetting (3.6 mm day-1) compared to pre-restoration ET rates of 2.7 mm day-1. Total storage changes were restricted following rewetting, as a factor of the reduced runoff losses limiting water table drawdown, thereby constraining peat compression and preventing undue drying of the unsaturated zone. Changes to the system hydrology following rewetting of the peatland by blocking drainage ditches created conditions more favourable for Sphagnum survival through increasing the moisture content and soil-water pressures within the remnant peat deposit; although restoration efforts should aim to constrain water table fluctuations to within the upper 30 cm.

Subjects/Keywords: peatland; hydrology; Sphagnum; restoration; hydraulic conductivity

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APA (6^th Edition):

Ketcheson, S. J. (2011). An evaluation of the water balance and moisture dynamics within Sphagnum mosses following the restoration (rewetting) of an abandoned block-cut bog. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6328

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ketcheson, Scott James. “An evaluation of the water balance and moisture dynamics within Sphagnum mosses following the restoration (rewetting) of an abandoned block-cut bog.” 2011. Thesis, University of Waterloo. Accessed January 27, 2020. http://hdl.handle.net/10012/6328.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ketcheson, Scott James. “An evaluation of the water balance and moisture dynamics within Sphagnum mosses following the restoration (rewetting) of an abandoned block-cut bog.” 2011. Web. 27 Jan 2020.

Vancouver:

Ketcheson SJ. An evaluation of the water balance and moisture dynamics within Sphagnum mosses following the restoration (rewetting) of an abandoned block-cut bog. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10012/6328.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ketcheson SJ. An evaluation of the water balance and moisture dynamics within Sphagnum mosses following the restoration (rewetting) of an abandoned block-cut bog. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/6328

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Arizona

14. Vera, Mauricio Alfredo. What Defines the Effective Hydraulic Conductivity of a Heterogeneous Medium? .

Degree: 2018, University of Arizona

URL: http://hdl.handle.net/10150/628584

► Geologic processes produce heterogeneous porous materials that are complex systems to analyze. This research is focused on the bulk behavior of these heterogeneous media, specifically,… (more)

▼ Geologic processes produce heterogeneous porous materials that are complex systems to analyze. This research is focused on the bulk behavior of these heterogeneous media, specifically, the effective hydraulic conductivity (Keff). Specifically, I studied media comprised of two block materials with different K values to understand how the percent composition of the materials and their spatial distribution affect Keff. Two approaches are taken. First, I examine an exponential mixing law, that describes Keff as falling between two end members when the materials are distributed parallel to (arithmetic) and perpendicular to (harmonic) the flow direction. The results, based on examining steady state flow through 990,000 grids with MODFLOW linked with MATLAB, indicate a linear increase in the exponent describing K mixing as a function of the fraction of the high K material included, leading to an expression that estimates Keff with an R2 of 0.982. Second, I show that an approach based on energy dissipation weighting, while difficult to infer visually, returns a perfect explanation of K weighting.; Procesos geológicos producen materiales porosos heterogéneos que son complejos sistemas de análisis. Esta investigación se enfoca en el comportamiento aparente de estos medios heterogéneos, específicamente, la conductividad hidráulica efectiva (Keff). Específicamente, estudio un medio compuesto de bloques de materiales con diferentes valores de K (conductividad hidráulica) con el fin de entender como el porcentaje de la composición de los materiales y su distribución afecta a la Keff. Dos aproximaciones son consideradas. En primer lugar, examine una ley de mezcla exponencial, que describa los límites de Keff cuando los materiales son distribuidos paralelamente (aritmética) y perpendiculares (armoníca) a la dirección del flujo. Los resultados examinados, basados en flujos constantes por medio de 990,000 grillas en MODFLOW enlazado con MATLAB, indica un incremento lineal en el exponente que describe K mezclado como función de la fracción de material K alto incluido, liderando una expresión que estima Keff con un R2 de 0.982. Segundo, muestro que una aproximación basada en la ponderación de la disipación de energía, aunque es difícil de inferir visualmente, arroja una explicación perfecta de la ponderación de K. Advisors/Committee Members: Ferré, Ty P.A (advisor), Meixner, Thomas (committeemember), Maddock, Thomas (committeemember), Dickinson, Jesse (committeemember).

Subjects/Keywords: Effective Hydraulic Conductivity; Heterogeneous Media; MODFLOW

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APA (6^th Edition):

Vera, M. A. (2018). What Defines the Effective Hydraulic Conductivity of a Heterogeneous Medium? . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/628584

Chicago Manual of Style (16^th Edition):

Vera, Mauricio Alfredo. “What Defines the Effective Hydraulic Conductivity of a Heterogeneous Medium? .” 2018. Masters Thesis, University of Arizona. Accessed January 27, 2020. http://hdl.handle.net/10150/628584.

MLA Handbook (7^th Edition):

Vera, Mauricio Alfredo. “What Defines the Effective Hydraulic Conductivity of a Heterogeneous Medium? .” 2018. Web. 27 Jan 2020.

Vancouver:

Vera MA. What Defines the Effective Hydraulic Conductivity of a Heterogeneous Medium? . [Internet] [Masters thesis]. University of Arizona; 2018. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10150/628584.

Council of Science Editors:

Vera MA. What Defines the Effective Hydraulic Conductivity of a Heterogeneous Medium? . [Masters Thesis]. University of Arizona; 2018. Available from: http://hdl.handle.net/10150/628584

University of Texas – Austin

15. Schulz, Eric Clinton. Conductivity of proppant mixtures.

Degree: MSin Engineering, Petroleum Engineering, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/26439

► Hydraulic fracturing is a physically complex phenomenon, and there are many variables, both environmental and operational, that affect the overall success of a fracture treatment.… (more)

▼ Hydraulic fracturing is a physically complex phenomenon, and there are many variables, both environmental and operational, that affect the overall success of a fracture treatment. Amongst the operational variables, the process of proppant selection is key to ensuring that the induced fractures remain open and permeable. A variety of physical mechanisms act to degrade the permeability of a given proppant packing after deposition in a fracture, the most important of which is the magnitude of the confining stress. The goal of this work is to understand how mixtures of unlike proppants behave under various stress conditions. Specifically, the permeability and conductivity of various mixtures of unlike proppants are measured as a function of confining stress. A secondary investigation is also made into the dependence of permeability on the areal concentration of proppant. Choices of proppants are restricted to those which are currently most common in industry, in terms of both material and size. To that end, mixtures consisted of primarily ceramics and sands with appropriate grain size distributions. Additionally, a light-weight plastic proppant was included in the study. Simple laboratory methods are employed to measure the permeability of the various proppant packings. Values obtained from direct experimentation are compared with values obtained from an independent analytical model. Given the assumptions which are inherent in the analytical model, the experimental and analytical results are in satisfactory agreement. Also, a correlation is developed for single proppants and binary mixtures which predicts permeability as a function of stress, grain size, material, and weight fraction. One key conclusion is that for a binary mixture of proppants, the mixture permeability will not generally be a weighted linear combination of the pure proppant permeabilities. In other words, the permeability of a mixture comprised of 50% (by weight) of one component and 50% of the second component will generally not be halfway between the permeabilities of the single components. A hypothesis is presented which posits that there are threshold weight fractions for each proppant pair that control the permeability of the mixture. Advisors/Committee Members: Mohanty, Kishore Kumar (advisor).

Subjects/Keywords: Hydraulic fracturing; Proppant mixtures; Conductivity testing; Correlation

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APA (6^th Edition):

Schulz, E. C. (2014). Conductivity of proppant mixtures. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26439

Chicago Manual of Style (16^th Edition):

Schulz, Eric Clinton. “Conductivity of proppant mixtures.” 2014. Masters Thesis, University of Texas – Austin. Accessed January 27, 2020. http://hdl.handle.net/2152/26439.

MLA Handbook (7^th Edition):

Schulz, Eric Clinton. “Conductivity of proppant mixtures.” 2014. Web. 27 Jan 2020.

Vancouver:

Schulz EC. Conductivity of proppant mixtures. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/2152/26439.

Council of Science Editors:

Schulz EC. Conductivity of proppant mixtures. [Masters Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26439

Luleå University of Technology

16. Abitew, Aymiro. Hydro-Geotechnical Study of Tailings at Aitik Mine : Emphasis on Hydraulic Conductivity of the Deposit.

Degree: 2012, Luleå University of Technology

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44287

►

The main objective of this study is to characterize the tailings deposit at Aitik Mine in terms of its hydro geotechnical properties with more… (more)

▼

The main objective of this study is to characterize the tailings deposit at Aitik Mine in terms of its hydro geotechnical properties with more emphasis on hydraulic conductivity and present their vertical and horizontal distribution. In this study, relationship between each parameter has also been identified. The investigation has been done in three sections which cover approximately 3km2 of area and 4-5meters vertically. 3-5 test pits have been excavated in each section and disturbed and undisturbed samples are collected from various levels. Apart from in situ tests like balloon density, laboratory investigations have been done on the collected samples. These tests includes: Proctor compaction, particle density termination, grain size analysis, and permeability. Evaluation of existing empirical relations between grain size analysis and hydraulic conductivity were also one of the aims of this thesis work.The horizontal hydraulic conductivity has been found to have a good correlation to fine fraction and void ratio. Similar to the results of Jantzer et al (2008), the increased void ratio did not correspond to vertical hydraulic conductivity. Based on evaluation of Hazen (1911) and Chapuis et al (2003) formulas using the samples collected, conclusions have been made. Therefore, Hazen formula (1911) has given 25 and 45 times the measured values of vertical and horizontal hydraulic conductivity respectively. On the other hand, Chapuis et al (2003) has not been succeeded for prediction of hydraulic conductivity of undisturbed samples. However, it has given comparatively good prediction of hydraulic conductivity for disturbed samples which are compacted to their field dry density. Particle density, porosity and void ratio results are in agreement with the range determined by Yunxin (2001), Shamsai (2007), and Jantzer et al (2008) on different tailings deposit. Ice layers are encountered exactly above layers with higher silt and clay contents. Silty SAND is discovered to be the predominant soil type in the investigated area.Because the study was able to cover only part of the whole deposit, further detailed investigation covering the whole area and depth of the deposit is recommended to be done in the future. Additionally, monitoring and continuous measurements are important to minimize uncertainty that could be caused by seasonal tailings property changes.

Validerat; 20120622 (anonymous)

Subjects/Keywords: Technology; Hydraulic conductivity; Tailings; void ratio; Teknik

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APA (6^th Edition):

Abitew, A. (2012). Hydro-Geotechnical Study of Tailings at Aitik Mine : Emphasis on Hydraulic Conductivity of the Deposit. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Abitew, Aymiro. “Hydro-Geotechnical Study of Tailings at Aitik Mine : Emphasis on Hydraulic Conductivity of the Deposit.” 2012. Thesis, Luleå University of Technology. Accessed January 27, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Abitew, Aymiro. “Hydro-Geotechnical Study of Tailings at Aitik Mine : Emphasis on Hydraulic Conductivity of the Deposit.” 2012. Web. 27 Jan 2020.

Vancouver:

Abitew A. Hydro-Geotechnical Study of Tailings at Aitik Mine : Emphasis on Hydraulic Conductivity of the Deposit. [Internet] [Thesis]. Luleå University of Technology; 2012. [cited 2020 Jan 27]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Abitew A. Hydro-Geotechnical Study of Tailings at Aitik Mine : Emphasis on Hydraulic Conductivity of the Deposit. [Thesis]. Luleå University of Technology; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

National University of Ireland – Galway

17. O'Connell, Yvonne. Hydrogeophysics of coastal aquifers - geophysical applications to the assessment of groundwater properties in coastal gravel and karst aquifers .

Degree: 2017, National University of Ireland – Galway

URL: http://hdl.handle.net/10379/6528

► Airborne, terrestrial and marine geophysics have been employed to examine coastal zone hydrogeology in two very different aquifer types in Ireland. Modelling of regional airborne… (more)

▼ Airborne, terrestrial and marine geophysics have been employed to examine coastal zone hydrogeology in two very different aquifer types in Ireland. Modelling of regional airborne electromagnetic data informed by ground-based ERT allowed the determination of the aquifer electrical resistivity/conductivity distribution within a locally important coastal sand and gravel aquifer on the east coast. The effective electrical conductivity as a function of porosity for the groundwater body was estimated with salinity and clay mass fraction constraints from supplementary drilling. The hydraulic conductivity depth function was estimated after calibration with a hydraulic conductivity measurement in the field allowing a determination of lateral variations in groundwater hydraulic conductivity across the sand and gravel aquifer, showing potential for upscaling to catchment scale water resource management. On the west coast of Ireland, groundwater movement in two catchments of a regionally important coastal karst aquifer was examined with terrestrial and marine geophysics. This hydrogeophysical examination confirmed the extension of faulting offshore and groundwater egress/saltwater ingress along fault. The examination of subterranean conduit and epikarstic flow paths and intertidal and submarine groundwater discharge provided new evidence for previously predicted terrestrial and submarine pathways confirming the existence of active SGD. Discrete conduit network modelling, informed by the terrestrial geophysics coupled with ancillary hydrogeological observations characterised the hydrogeology of one of the catchments by determining flow pathways and their likely hydraulic mechanisms indicating a complex conduit network of constrictions and bypass channels with multiple inlets and outlets. This work augments our understanding of groundwater movement in the coastal zone for the management of coastal aquifer systems and provides transferrable practices to assist in catchment-scale assessments of coastal aquifers. Advisors/Committee Members: Daly, Eve (advisor).

Subjects/Keywords: Hydrogeophysics; Aquifer porosity; Electrical conductivity; Hydraulic conductivity; Submarine groundwater discharge

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APA (6^th Edition):

O'Connell, Y. (2017). Hydrogeophysics of coastal aquifers - geophysical applications to the assessment of groundwater properties in coastal gravel and karst aquifers . (Thesis). National University of Ireland – Galway. Retrieved from http://hdl.handle.net/10379/6528

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

O'Connell, Yvonne. “Hydrogeophysics of coastal aquifers - geophysical applications to the assessment of groundwater properties in coastal gravel and karst aquifers .” 2017. Thesis, National University of Ireland – Galway. Accessed January 27, 2020. http://hdl.handle.net/10379/6528.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

O'Connell, Yvonne. “Hydrogeophysics of coastal aquifers - geophysical applications to the assessment of groundwater properties in coastal gravel and karst aquifers .” 2017. Web. 27 Jan 2020.

Vancouver:

O'Connell Y. Hydrogeophysics of coastal aquifers - geophysical applications to the assessment of groundwater properties in coastal gravel and karst aquifers . [Internet] [Thesis]. National University of Ireland – Galway; 2017. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10379/6528.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

O'Connell Y. Hydrogeophysics of coastal aquifers - geophysical applications to the assessment of groundwater properties in coastal gravel and karst aquifers . [Thesis]. National University of Ireland – Galway; 2017. Available from: http://hdl.handle.net/10379/6528

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

18. Ozotta, Ogochukwu. Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen.

Degree: MS, Geological Engineering, 2018, University of North Dakota

URL: https://commons.und.edu/theses/2424

► Groundwater flow and its dissolved mineral transport plays a fundamental role in the ecology of many wetlands. Installation of equipment to map groundwater seepage,… (more)

▼ Groundwater flow and its dissolved mineral transport plays a fundamental role in the ecology of many wetlands. Installation of equipment to map groundwater seepage, however, is invasive and may damage vegetation and potentially affect biodiversity. By mapping surface temperature remotely in the late summer, when the differential between warm soil and cold groundwater is the greatest, the temperature patterns may reveal areas of greatest upward gradient and flow. To test the hypothesis, the effect that hydraulic gradient has on surface temperature in a fen located at the north end of the Cherry Lake Aquifer, Eddy County, ND (47.73, -98.66) was monitored and measured. Thermal imaging was used to characterize groundwater seepage, the results were compared to conventional method of installing shallow ceramic cup tensiometers to measure hydraulic gradient, and estimate flux using Darcy’s law. Shallow temperature loggers were installed to characterize soil temperature at the same sites. The approach was applied at contrasting two locations: a sedge-cattail covered site (Sedge) and a nearby site with cordgrass and closed-canopy shrubs and trees (Willow). Both sites showed variable hydraulic gradients between the shallow and deep tensiometer, perhaps related to variation in transpiration. The temperature trend determined from the thermal imaging showed a closer relationship to hydraulic gradients measured at the Sedge site more than at the Willow site. The hydraulic conductivity, K ranged from 6 × 10-6 to 2 × 10-4 m/s for both sites, which falls within values typical for fen sediments. The flux calculated for the Willow site ranged from 1.4 × 10-5 to 1.1 × 10-4 m/s and that of the Sedge site ranged from 4.5 × 10-6 to 1.1 × 10-5 m/s. Willow site thermal imaging did not show similar trend with the hydraulic gradient, suggesting tree cover can affect thermal signature at the surface. Temperature profile observations from the thermal aerial imagery and the FLIR C2 camera showed a similar trend. Both forward and inverse modeling of temperature profiles, which is based on a one-dimensional solution to the advection-conduction equation (Kurylyk et al. 2017), were used to more thoroughly characterize the shallow variation of flux compared to thermal imaging, coupled with additional field data on temperature distribution, thermal conductivity, depth, and layer thickness. Accounting for soil layer properties plays a role in characterizing groundwater seepage direction and rate. The gradients are affected at some depth because of the varying soil stratigraphy, which explains the reason why the seepage faces cannot be mapped completely using thermal imaging at these sites. Advisors/Committee Members: Philip J. Gerla.

Subjects/Keywords: Fen; Groundwater-surface water; Hydraulic conductivity; Hydraulic gradient; Seepage; Thermal imaging

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APA (6^th Edition):

Ozotta, O. (2018). Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/2424

Chicago Manual of Style (16^th Edition):

Ozotta, Ogochukwu. “Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen.” 2018. Masters Thesis, University of North Dakota. Accessed January 27, 2020. https://commons.und.edu/theses/2424.

MLA Handbook (7^th Edition):

Ozotta, Ogochukwu. “Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen.” 2018. Web. 27 Jan 2020.

Vancouver:

Ozotta O. Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen. [Internet] [Masters thesis]. University of North Dakota; 2018. [cited 2020 Jan 27]. Available from: https://commons.und.edu/theses/2424.

Council of Science Editors:

Ozotta O. Using Thermal Imaging To Characterize Groundwater Seepage In A North Dakota Fen. [Masters Thesis]. University of North Dakota; 2018. Available from: https://commons.und.edu/theses/2424

19. Zapata Coacalla, Tania. Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar.

Degree: Mestrado, Geotecnia, 2012, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-08112012-113750/ ;

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O presente trabalho teve por objetivo avaliar o potencial do ensaio de ascensão capilar e de uma técnica de otimização de parâmetros para estimar os… (more)

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O presente trabalho teve por objetivo avaliar o potencial do ensaio de ascensão capilar e de uma técnica de otimização de parâmetros para estimar os parâmetros hidráulicos dos solos. O ensaio de ascensão capilar é de execução simples e rápida e reflete um fenômeno condicionado pelas propriedades hidráulicas do solo. Na representação matemática da ascensão capilar, utilizou-se o modelo de Terzaghi (1943) que considerou tratar-se de uma condição de fluxo governada pela condutividade hidráulica saturada (ks), e o modelo de Lu & Likos (2004b), que utilizaram a equação de Gardner (1958) para representar a função condutividade hidráulica, considerando que o fluxo se dá em meio não saturado. O processo de otimização utilizou a rotina SOLVER componente do programa EXCEL, e foi testado utilizando-se os dados experimentais de Lane & Washburn (1946) e de Zhang & Fredlund (2009). Em seguida, resultados de ascensão capilar de oito amostras de solos típicos do Estado do São Paulo, Brasil, foram modelados com os parâmetros derivados da técnica. Observou-se que tanto o modelo de Terzaghi (1943) quanto o de Lu & Likos (2004b) conseguiram reproduzir os resultados experimentais de ascensão capilar, com melhores resultados associados ao modelo de Lu & Likos (2004b) para a maior parte dos solos analisados. A previsão da condutividade hidráulica saturada, de forma geral, diferiu menos de uma ordem de grandeza dos valores medidos experimentalmente, embora maiores discrepâncias tenham sido notadas para determinados tipos de solos. O parâmetro de Gardner da função condutividade hidráulica resultou em valores da mesma ordem de grandeza dos valores reportados na literatura para solos similares. Os resultados sobre a aplicação do ensaio de ascensão capilar e da técnica de otimização mostraram-se promissores para a determinação de parâmetros hidráulicos dos solos analisados, com a vantagem de ter-se um procedimento simples e rápido para a finalidade descrita.

This study evaluates the potential of capillary rise test and a parameter optimization technique to estimate soil hydraulic parameters. The capillary rise is a simple and expedite test that is conditioned by soil hydraulic properties. In the mathematical representation of the capillary rise we used the model of Terzaghi (1943), who considered that saturated hydraulic conductivity commands the phenomeno and the model of Lu & Likos (2004b) who used the Gardner equation (1958) to represent the hydraulic conductivity function, considering that the flow takes place in a non-saturated condition. The optimization process used the SOLVER routine, component of the EXCEL program, that was firstly tested using experimental data of Lane & Washburn (1946) and Zhang & Fredlund (2009). Then, results of capillary rise of eight samples of typical soils of the State of São Paulo, Brazil, were modeled with the parameters derived from the technique. It was observed that both the Terzaghi (1943) and Lu & Likos (2004b) models were able to reproduce the experimental results of capillarity, although the best…

Advisors/Committee Members: Vilar, Orencio Monje.

Subjects/Keywords: Ascensão capilar; Capillary rise; Condutividade hidráulica saturada; Função condutividade hidráulica; Hydraulic conductivity function; Optimization; Otimização; Saturated hydraulic conductivity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zapata Coacalla, T. (2012). Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18132/tde-08112012-113750/ ;

Chicago Manual of Style (16^th Edition):

Zapata Coacalla, Tania. “Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar.” 2012. Masters Thesis, University of São Paulo. Accessed January 27, 2020. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-08112012-113750/ ;.

MLA Handbook (7^th Edition):

Zapata Coacalla, Tania. “Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar.” 2012. Web. 27 Jan 2020.

Vancouver:

Zapata Coacalla T. Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar. [Internet] [Masters thesis]. University of São Paulo; 2012. [cited 2020 Jan 27]. Available from: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-08112012-113750/ ;.

Council of Science Editors:

Zapata Coacalla T. Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar. [Masters Thesis]. University of São Paulo; 2012. Available from: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-08112012-113750/ ;

Delft University of Technology

20. Shirasagi, S. Hybrid Rowe cell for measurement of complex conductivity:.

Degree: 2009, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:43e5dd6e-39d8-4710-8042-8e4620f8baa1

► Peat is sediment consisting of incompletely decomposed organic matter deposited in swamp and marsh. It has served for a long time as benefits for human… (more)

▼ Peat is sediment consisting of incompletely decomposed organic matter deposited in swamp and marsh. It has served for a long time as benefits for human beings. Meanwhile, it has posed huge challenges to geotechnical engineers because of its unique characteristics such as anisotropy, low stiffness, high compressibility and strong creep susceptibility. In order to realise more effective and efficient site investigations, it is highly expected to apply geophysical techniques as well as core-boring, CPTs, sampling and laboratory tests because the techniques promise to be great contributions not only for two- or three-dimensional mapping but also for accurate interpretation of its physical, chemical and engineering properties in non-destructive way. Then, a new apparatus has been developed, called hybrid Rowe cell. It combines the functions of a traditional hydraulic cell and an electrical capacitor. This can simultaneously measure electrical properties and physical, mechanical and hydrological properties of soil samples, allowing to investigate their correlation accurately. This work focuses on the study of the applicability and calibration of the new hybrid cell, and the relationship between electrical conductivities of bulk peat and pore water which saturates the sample. The applicability of the hybrid cell was examined by using water as calibration. The results were then compared with values reported earlier and the experimental set-up was also compared with similar one found in literature. As a result, it was proven that the new cell successfully prevented electrode polarization and was applicable for this type of measurements. The electrical measurements on peat showed a relationship between the electrical conductivities of bulk peat and pore water which could be well predicted by a model previously developed for peat as well as the modified Archie’s law. In addition, the modified Archie’s law could be considered to be a persuasive model for the electrical behaviours observed in this study. For the future research, it is highly expected that the frequency of input currents is extended to lower range (< 20 Hz), input electric currents are properly controlled to avoid non-linear effects, and also hydraulic consolidation tests are performed in parallel with electrical measurements. Advisors/Committee Members: Ngan-Tillard, D., Ponziani, M..

Subjects/Keywords: Rowe cell; electrical conductivity; electrical double layer; induced polarisation; Archie’s law; peat; hydraulic conductivity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shirasagi, S. (2009). Hybrid Rowe cell for measurement of complex conductivity:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:43e5dd6e-39d8-4710-8042-8e4620f8baa1

Chicago Manual of Style (16^th Edition):

Shirasagi, S. “Hybrid Rowe cell for measurement of complex conductivity:.” 2009. Masters Thesis, Delft University of Technology. Accessed January 27, 2020. http://resolver.tudelft.nl/uuid:43e5dd6e-39d8-4710-8042-8e4620f8baa1.

MLA Handbook (7^th Edition):

Shirasagi, S. “Hybrid Rowe cell for measurement of complex conductivity:.” 2009. Web. 27 Jan 2020.

Vancouver:

Shirasagi S. Hybrid Rowe cell for measurement of complex conductivity:. [Internet] [Masters thesis]. Delft University of Technology; 2009. [cited 2020 Jan 27]. Available from: http://resolver.tudelft.nl/uuid:43e5dd6e-39d8-4710-8042-8e4620f8baa1.

Council of Science Editors:

Shirasagi S. Hybrid Rowe cell for measurement of complex conductivity:. [Masters Thesis]. Delft University of Technology; 2009. Available from: http://resolver.tudelft.nl/uuid:43e5dd6e-39d8-4710-8042-8e4620f8baa1

University of Arizona

21. Wang, Yu-Li Eric. Characterizing Subsurface Hydraulic Characteristics at Zhuoshui River Alluvial Fan, Taiwan .

Degree: 2016, University of Arizona

URL: http://hdl.handle.net/10150/623152

► The objective of this study is to estimate 2-D spatial distribution of hydraulic conductivity (Ks) of Zhuoshui River alluvial fan, Taiwan, using groundwater level data… (more)

Subjects/Keywords: Hydraulic Conductivity (Ks); Hydraulic Tomography (HT); River Stage Tomography; Subsurface Heterogeneity; Groundwater

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, Y. E. (2016). Characterizing Subsurface Hydraulic Characteristics at Zhuoshui River Alluvial Fan, Taiwan . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/623152

Chicago Manual of Style (16^th Edition):

Wang, Yu-Li Eric. “Characterizing Subsurface Hydraulic Characteristics at Zhuoshui River Alluvial Fan, Taiwan .” 2016. Masters Thesis, University of Arizona. Accessed January 27, 2020. http://hdl.handle.net/10150/623152.

MLA Handbook (7^th Edition):

Wang, Yu-Li Eric. “Characterizing Subsurface Hydraulic Characteristics at Zhuoshui River Alluvial Fan, Taiwan .” 2016. Web. 27 Jan 2020.

Vancouver:

Wang YE. Characterizing Subsurface Hydraulic Characteristics at Zhuoshui River Alluvial Fan, Taiwan . [Internet] [Masters thesis]. University of Arizona; 2016. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10150/623152.

Council of Science Editors:

Wang YE. Characterizing Subsurface Hydraulic Characteristics at Zhuoshui River Alluvial Fan, Taiwan . [Masters Thesis]. University of Arizona; 2016. Available from: http://hdl.handle.net/10150/623152

22. Jauhiainen, Mikko. Relationships of Particle Size Distribution Curve, Soil Water Retention Curve and Unsaturated Hydraulic Conductivity and Their Implications on Water Balance of Forested and Agricultural Hillslopes.

Degree: 2004, Helsinki University of Technology

URL: http://lib.tkk.fi/Diss/2004/isbn9512271958/

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The primary objectives of this study were to determine selected soil water retention curves for Finnish forest sites and to develop a methodology that predicts… (more)

Subjects/Keywords: hydrology; soil water flow; water retention; hydraulic conductivity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jauhiainen, M. (2004). Relationships of Particle Size Distribution Curve, Soil Water Retention Curve and Unsaturated Hydraulic Conductivity and Their Implications on Water Balance of Forested and Agricultural Hillslopes. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2004/isbn9512271958/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jauhiainen, Mikko. “Relationships of Particle Size Distribution Curve, Soil Water Retention Curve and Unsaturated Hydraulic Conductivity and Their Implications on Water Balance of Forested and Agricultural Hillslopes.” 2004. Thesis, Helsinki University of Technology. Accessed January 27, 2020. http://lib.tkk.fi/Diss/2004/isbn9512271958/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jauhiainen, Mikko. “Relationships of Particle Size Distribution Curve, Soil Water Retention Curve and Unsaturated Hydraulic Conductivity and Their Implications on Water Balance of Forested and Agricultural Hillslopes.” 2004. Web. 27 Jan 2020.

Vancouver:

Jauhiainen M. Relationships of Particle Size Distribution Curve, Soil Water Retention Curve and Unsaturated Hydraulic Conductivity and Their Implications on Water Balance of Forested and Agricultural Hillslopes. [Internet] [Thesis]. Helsinki University of Technology; 2004. [cited 2020 Jan 27]. Available from: http://lib.tkk.fi/Diss/2004/isbn9512271958/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jauhiainen M. Relationships of Particle Size Distribution Curve, Soil Water Retention Curve and Unsaturated Hydraulic Conductivity and Their Implications on Water Balance of Forested and Agricultural Hillslopes. [Thesis]. Helsinki University of Technology; 2004. Available from: http://lib.tkk.fi/Diss/2004/isbn9512271958/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

23. Cañabi Quispe, Luis Miguel. Consolidação de um rejeito de mineração de areia e modelação do enchimento de um reservatório para sua disposição.

Degree: Mestrado, Geotecnia, 2011, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-06122011-113547/ ;

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Rejeitos de mineração com muita freqüência são dispostos na forma de lama. A capacidade de estocagem das lagoas onde são depositados depende de suas dimensões… (more)

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Rejeitos de mineração com muita freqüência são dispostos na forma de lama. A capacidade de estocagem das lagoas onde são depositados depende de suas dimensões e formas de operação, mas também das características físicas, compressibilidade e condutividade hidráulica da lama. No presente trabalho estudam-se as características de consolidação de uma lama argilosa resultante da mineração de areia, por meio do ensaio de consolidação hidráulica (HCT) e modela-se o enchimento de uma lagoa de disposição desse rejeito, empregando a teoria de grandes deformações e mediante o software CONDES. Realizaram-se ensaios de caracterização e HCT com amostras coletadas das lagoas 2, 11 e vertedouro da Mineração Jundu Ltda. em Descalvado, São Paulo. Estes parâmetros foram necessários para as análises de simulação numérica do processo de enchimento da Lagoa 11. Os resultados dos ensaios HCT mostraram um conjunto consistente de propriedades constitutivas do material, também se verificou a importância de alcançar a condição estável nas leituras da diferença de pressão entre o topo e a base do corpo de prova, assim obter uma menor variabilidade dos resultados. A simulação de enchimento se mostrou consistente, onde se obteve a evolução do processo de consolidação em diferentes etapas do lançamento da lama. Observou-se uma concordância dos resultados obtidos na simulação de enchimento. Segundo as análises observou-se que a altura dos rejeitos após um período de dois anos é da ordem de 1.57 m.

Mining waste is frequently disposed of in the form of mud. The storage capacity of a collection reservoir of mining waste depends on its dimensions and on its operational processes, which are based on the physical characteristics of the mud and its compressibility and hydraulic conductivity. This research focuses on the study of the consolidation characteristics of a clayey mud resultant from the process of sand mining. Such characteristics were studied through Hydraulic Consolidation Tests (HCT) and by modeling the waste reservoir filling process using large deformation theory and the CONDES software. Characterization and hydraulic consolidation tests were performed on samples obtained from Reservoirs 2 and 11 and from the Jundu Mine spillway at Descalvado City in the state of São Paulo, Brazil. The characterization parameters obtained were employed in performing numerical analysis of the filling process of waste reservoir 11. HCT test results show the acceptable set of constitutive properties of the analyzed material. During the testing procedures, variability of test results were minimized by obtaining stabilized pressure difference readings between the top and bottom leads of the specimen. Modeling was conducted for instantaneous and progressive filling and both methods yielded the same results. It was observed a predictable parity between the results obtained from instantaneous and progressive filling simulations. The final height after consolidation was measured at approximately two years for both instantaneous and progressive methods of filling.…

Advisors/Committee Members: Esquivel, Edmundo Rogerio.

Subjects/Keywords: Compressibilidade; Compressibility; Condutividade hidráulica; Consolidação; Consolidation; HCT; HCT; Hydraulic conductivity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cañabi Quispe, L. M. (2011). Consolidação de um rejeito de mineração de areia e modelação do enchimento de um reservatório para sua disposição. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18132/tde-06122011-113547/ ;

Chicago Manual of Style (16^th Edition):

Cañabi Quispe, Luis Miguel. “Consolidação de um rejeito de mineração de areia e modelação do enchimento de um reservatório para sua disposição.” 2011. Masters Thesis, University of São Paulo. Accessed January 27, 2020. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-06122011-113547/ ;.

MLA Handbook (7^th Edition):

Cañabi Quispe, Luis Miguel. “Consolidação de um rejeito de mineração de areia e modelação do enchimento de um reservatório para sua disposição.” 2011. Web. 27 Jan 2020.

Vancouver:

Cañabi Quispe LM. Consolidação de um rejeito de mineração de areia e modelação do enchimento de um reservatório para sua disposição. [Internet] [Masters thesis]. University of São Paulo; 2011. [cited 2020 Jan 27]. Available from: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-06122011-113547/ ;.

Council of Science Editors:

Cañabi Quispe LM. Consolidação de um rejeito de mineração de areia e modelação do enchimento de um reservatório para sua disposição. [Masters Thesis]. University of São Paulo; 2011. Available from: http://www.teses.usp.br/teses/disponiveis/18/18132/tde-06122011-113547/ ;

24. Sousa, Helon Hébano de Freítas. Fluxo preferencial de água no solo pela aplicação da equação de Darcy-Buckingham e do método do balanço de água no solo.

Degree: PhD, Solos e Nutrição de Plantas, 2014, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/11/11140/tde-12082014-144858/ ;

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O conhecimento dos processos que envolvem o movimento da água no solo e de fundamental importância para o manejo e a conservação do solo e… (more)

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O conhecimento dos processos que envolvem o movimento da água no solo e de fundamental importância para o manejo e a conservação do solo e da água. Ha situações em que, durante um evento de chuva intensa, a água se move mais rapidamente no perfil através de canais, sem que haja interação com a matriz do solo; esse movimento e chamado de fluxo preferencial. Atualmente e aceita em estudos de campo a existência deste fluxo preferencial em uma ampla variedade de solos. No entanto, muitos métodos utilizados para determiná-lo diretamente alteram o fluxo da água através da matriz do solo, processo de drenagem de relevância indiscutível nos solos. Em trabalho recente realizado no Japão, esse problema foi superado com sucesso pela aplicação concomitante, durante e um pouco após os eventos de chuva, da equação de Darcy-Buckingham e do método do balanço de água no solo: a equação de Darcy-Buckingham infere sobre a presença de fluxo preferencial da água, definido, nessa abordagem, como o resíduo da equação do balanço de água no solo durante os eventos de chuva. Este método apresenta, portanto, a grande vantagem de tornar possível a determinação experimental do fluxo preferencial a uma dada profundidade do solo, em condições de campo, sem interromper significativamente o fluxo mátrico de água. O objetivo deste trabalho foi a determinação e caracterização do fluxo preferencial da água nas profundidades correspondentes aos horizontes B textural e B latossólico de um Nitossolo Vermelho eutrófico em condições de campo, aplicando a equação de Darcy-Buckingham e o método do balanço de água no solo, durante e um pouco após os eventos de chuva. Devido ao baixo volume de chuva durante a última estação chuvosa, em apenas duas situações foi possível reconhecer uma alteração significativa na umidade do solo em profundidades superiores a 0,5m e nas duas situações foi verificada fluxo preferencial no horizonte Bt, não foi verificado fluxo preferencial no horizonte Bw durante os eventos chuvosos avaliados. A metodologia utilizada foi eficiente na observação de fluxos de água no solo que não são influenciados pela matriz.

The understanding of the processes involving soil water movement is essential to soil and water management and conservation. There are situations in which the water moves faster in the soil profile through channels, during an event of intense rain, without interacting with soil matrix; this movement is known as preferential flow. Currently, it is accepted in field studies the existence of preferential flow in a wide range of soils. Nevertheless, many methods used to directly determine it change the water flow through the soil matrix, a drainage process of unquestionable relevance in soils. In a recent study carried out in Japan, this problem has been successfully overcome by simultaneously applying Darcy-Buckingham\'s equation and the soil water balance method during and shortly after rain events; the Darcy-Buckingham\'s equation infers on the presence of preferential water flow, defined in this approach as the residue of…

Advisors/Committee Members: Libardi, Paulo Leonel.

Subjects/Keywords: Condutividade hidráulica; FDR; Fluxo mátrico; hydraulic conductivity; Matric flow; Nitosol; Nitossolo

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sousa, H. H. d. F. (2014). Fluxo preferencial de água no solo pela aplicação da equação de Darcy-Buckingham e do método do balanço de água no solo. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/11/11140/tde-12082014-144858/ ;

Chicago Manual of Style (16^th Edition):

Sousa, Helon Hébano de Freítas. “Fluxo preferencial de água no solo pela aplicação da equação de Darcy-Buckingham e do método do balanço de água no solo.” 2014. Doctoral Dissertation, University of São Paulo. Accessed January 27, 2020. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-12082014-144858/ ;.

MLA Handbook (7^th Edition):

Sousa, Helon Hébano de Freítas. “Fluxo preferencial de água no solo pela aplicação da equação de Darcy-Buckingham e do método do balanço de água no solo.” 2014. Web. 27 Jan 2020.

Vancouver:

Sousa HHdF. Fluxo preferencial de água no solo pela aplicação da equação de Darcy-Buckingham e do método do balanço de água no solo. [Internet] [Doctoral dissertation]. University of São Paulo; 2014. [cited 2020 Jan 27]. Available from: http://www.teses.usp.br/teses/disponiveis/11/11140/tde-12082014-144858/ ;.

Council of Science Editors:

Sousa HHdF. Fluxo preferencial de água no solo pela aplicação da equação de Darcy-Buckingham e do método do balanço de água no solo. [Doctoral Dissertation]. University of São Paulo; 2014. Available from: http://www.teses.usp.br/teses/disponiveis/11/11140/tde-12082014-144858/ ;

Dalhousie University

25. Jolous Jamshidi, Reza. EVALUATION OF CEMENT-TREATED SOILS SUBJECTED TO CYCLES OF FREEZING AND THAWING.

Degree: PhD, Department of Civil Engineering, 2014, Dalhousie University

URL: http://hdl.handle.net/10222/54065

► An extensive experimental study was performed to provide an insight on design and evaluation of cement-treated materials subjected to freeze/thaw (f/t) cycles. Poorly designed stabilized… (more)

▼ An extensive experimental study was performed to provide an insight on design and evaluation of cement-treated materials subjected to freeze/thaw (f/t) cycles. Poorly designed stabilized materials showed increases of up to three orders of magnitude in hydraulic conductivity and decreases of up to 95 percent in unconfined compressive strength values. Decrease in water to cement ratio was shown to partially improve f/t resistance for some of the scenarios investigated. A factorial experiment was designed to investigate the influence of curing time (immature vs. mature), freezing temperature (-2C vs -10C), and number of f/t cycles (4 vs. 12) during laboratory evaluation of a cement-treated silty sand. Results showed all the factors were significant in the observed changes in mechanical and hydraulic performance of the specimens. Observations emphasized the need for developing site-specific exposure scenarios in assessment of soil-cement under f/t exposure. An investigation on the influence of freezing dimensionality also showed a more practical three-dimensional f/t exposure can adequately represent a realistic one-dimensional f/t exposure scenario in terms of mechanical and hydraulic performance degradation. Monitoring percent mass loss (an indicator commonly used in industry) and compressive strength after f/t exposure under various scenarios showed they are not reliable indicators for predicting changes in hydraulic conductivity values under exposure to cycles of f/t. Resonant frequency measurements performed using the impact resonance method was suggested as a non-destructive technique in evaluation of hydraulic performance of cement-treated materials after f/t exposure. Microstructural evaluation of specimens using transmitted light microscopy showed matrix disruption and aggregate-paste interface cracking to be the main damage mechanisms for highly affected specimens. However, this technique was found unsuitable in detecting early stages of damage. Advisors/Committee Members: Dr. Paul Simms (external-examiner), Dr. Hany El Naggar (graduate-coordinator), Dr. Chris Holt (thesis-reader), Dr. Nouman Ali (thesis-reader), Dr. Craig B. Lake (thesis-supervisor), Not Applicable (ethics-approval), Yes (manuscripts), Not Applicable (copyright-release).

Subjects/Keywords: Soil; Stabilization; Hydraulic conductivity; Compressive strength; Resonant frequency; Freeze; Thaw; Cement

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jolous Jamshidi, R. (2014). EVALUATION OF CEMENT-TREATED SOILS SUBJECTED TO CYCLES OF FREEZING AND THAWING. (Doctoral Dissertation). Dalhousie University. Retrieved from http://hdl.handle.net/10222/54065

Chicago Manual of Style (16^th Edition):

Jolous Jamshidi, Reza. “EVALUATION OF CEMENT-TREATED SOILS SUBJECTED TO CYCLES OF FREEZING AND THAWING.” 2014. Doctoral Dissertation, Dalhousie University. Accessed January 27, 2020. http://hdl.handle.net/10222/54065.

MLA Handbook (7^th Edition):

Jolous Jamshidi, Reza. “EVALUATION OF CEMENT-TREATED SOILS SUBJECTED TO CYCLES OF FREEZING AND THAWING.” 2014. Web. 27 Jan 2020.

Vancouver:

Jolous Jamshidi R. EVALUATION OF CEMENT-TREATED SOILS SUBJECTED TO CYCLES OF FREEZING AND THAWING. [Internet] [Doctoral dissertation]. Dalhousie University; 2014. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/10222/54065.

Council of Science Editors:

Jolous Jamshidi R. EVALUATION OF CEMENT-TREATED SOILS SUBJECTED TO CYCLES OF FREEZING AND THAWING. [Doctoral Dissertation]. Dalhousie University; 2014. Available from: http://hdl.handle.net/10222/54065

University of Alberta

26. Hebb, Christina C. Persistence of subsoiling effects on the soil physical and hydraulic properties in a reconstructed soil.

Degree: MS, Department of Renewable Resources, 2015, University of Alberta

URL: https://era.library.ualberta.ca/files/ctd96k2545

► Surface mining is one of the most significant forms of anthropogenic disturbance to natural and managed ecosystems. In Alberta, mining disturbs large areas in the… (more)

▼ Surface mining is one of the most significant forms of anthropogenic disturbance to natural and managed ecosystems. In Alberta, mining disturbs large areas in the Mixedwood Boreal natural region and recovery is often slow because of poor soil quality, specifically the high degree of compaction. Soil compaction, caused by repeated traffic of heavy machinery during soil reconstruction of surface mined lands, hinders the re-establishment of vegetation. Compaction causes changes to soil physical properties such as increased bulk density and reduced macroporosity which reduce soil infiltration capacity, drainage and water holding capacity. The disruption of the soil water balance as a result of these compaction-induced changes to the soil further negatively effects the chemical and biological functioning in the soil because of poor aeration. In compacted forest soils, subsoiling with heavy-duty rip ploughs has been shown to be an effective method at ameliorating compaction by breaking up large compacted layers, into smaller aggregates and peds which significantly increases macroporosity, infiltration, drainage and aeration. The main objective of this research is to quantify any medium-term (~ 4 yrs) benefits of subsoiling with a heavy-duty rip plough on reconstructed soil at a coal mine. In 2010, an experimental research site was established at the Genesee Prairie Mine, 70 km west of Edmonton to investigate the potential for compaction amelioration using a McNabb winged subsoiler D7R XR to a 60 cm depth. Results showed that medium-term effects of ripping are variable with depth. Ripping effects on pore size distribution, saturated hydraulic conductivity, and bulk density were most pronounced in the 15-20 cm depth. Infiltration rates were increased by ripping which is expected to reduce hydraulic barriers at the soil surface. Evidence suggests non-ripped surface layers (5-10 cm depth) showed improvements in soil properties (bulk density, saturated hydraulic conductivity) as a result of natural processes (i.e., plant root expansion and drying-shrinkage). Over time, it appears that the effects of ripping have decreased, with a simultaneous improvement in non-ripped soils.

Subjects/Keywords: Subsoiling; Reclamation; Fractal Dimension; Moisture Retention Curve; Hydraulic Conductivity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hebb, C. C. (2015). Persistence of subsoiling effects on the soil physical and hydraulic properties in a reconstructed soil. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/ctd96k2545

Chicago Manual of Style (16^th Edition):

Hebb, Christina C. “Persistence of subsoiling effects on the soil physical and hydraulic properties in a reconstructed soil.” 2015. Masters Thesis, University of Alberta. Accessed January 27, 2020. https://era.library.ualberta.ca/files/ctd96k2545.

MLA Handbook (7^th Edition):

Hebb, Christina C. “Persistence of subsoiling effects on the soil physical and hydraulic properties in a reconstructed soil.” 2015. Web. 27 Jan 2020.

Vancouver:

Hebb CC. Persistence of subsoiling effects on the soil physical and hydraulic properties in a reconstructed soil. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2020 Jan 27]. Available from: https://era.library.ualberta.ca/files/ctd96k2545.

Council of Science Editors:

Hebb CC. Persistence of subsoiling effects on the soil physical and hydraulic properties in a reconstructed soil. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/ctd96k2545

Texas A&M University

27. Correa Castro, Juan. Evaluation and Effect of Fracturing Fluids on Fracture Conductivity in Tight Gas Reservoirs Using Dynamic Fracture Conductivity Test.

Degree: 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9106

► Unconventional gas has become an important resource to help meet our future energy demands. Although plentiful, it is difficult to produce this resource, when locked… (more)

▼ Unconventional gas has become an important resource to help meet our future energy demands. Although plentiful, it is difficult to produce this resource, when locked in a massive sedimentary formation. Among all unconventional gas resources, tight gas sands represent a big fraction and are often characterized by very low porosity and permeability associated with their producing formations, resulting in extremely low production rate. The low flow properties and the recovery factors of these sands make necessary continuous efforts to reduce costs and improve efficiency in all aspects of drilling, completion and production techniques. Many of the recent improvements have been in well completions and hydraulic fracturing. Thus, the main goal of a hydraulic fracture is to create a long, highly conductive fracture to facilitate the gas flow from the reservoir to the wellbore to obtain commercial production rates. Fracture conductivity depends on several factors, such as like the damage created by the gel during the treatment and the gel clean-up after the treatment. This research is focused on predicting more accurately the fracture conductivity, the gel damage created in fractures, and the fracture cleanup after a hydraulic fracture treatment under certain pressure and temperature conditions. Parameters that alter fracture conductivity, such as polymer concentration, breaker concentration and gas flow rate, are also examined in this study. A series of experiments, using a procedure of ?dynamical fracture conductivity test?, were carried out. This procedure simulates the proppant/frac fluid slurries flow into the fractures in a low-permeability rock, as it occurs in the field, using different combinations of polymer and breaker concentrations under reservoirs conditions. The result of this study provides the basis to optimize the fracturing fluids and the polymer loading at different reservoir conditions, which may result in a clean and conductive fracture. Success in improving this process will help to decrease capital expenditures and increase the production in unconventional tight gas reservoirs. Advisors/Committee Members: Zhu, Ding (advisor), Hill, Alfred D. (advisor), Sun, Yuefeng (committee member).

Subjects/Keywords: Dynamic fracture conductivity; hydraulic fracture; tight gas reservoirs

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Correa Castro, J. (2011). Evaluation and Effect of Fracturing Fluids on Fracture Conductivity in Tight Gas Reservoirs Using Dynamic Fracture Conductivity Test. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9106

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Correa Castro, Juan. “Evaluation and Effect of Fracturing Fluids on Fracture Conductivity in Tight Gas Reservoirs Using Dynamic Fracture Conductivity Test.” 2011. Thesis, Texas A&M University. Accessed January 27, 2020. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9106.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Correa Castro, Juan. “Evaluation and Effect of Fracturing Fluids on Fracture Conductivity in Tight Gas Reservoirs Using Dynamic Fracture Conductivity Test.” 2011. Web. 27 Jan 2020.

Vancouver:

Correa Castro J. Evaluation and Effect of Fracturing Fluids on Fracture Conductivity in Tight Gas Reservoirs Using Dynamic Fracture Conductivity Test. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9106.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Correa Castro J. Evaluation and Effect of Fracturing Fluids on Fracture Conductivity in Tight Gas Reservoirs Using Dynamic Fracture Conductivity Test. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9106

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Romero Lugo, Jose 1985-. Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using The Dynamic Conductivity Test.

Degree: 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148364

► Hydraulic Fracturing stimulation technology is used to increase the amount of oil and gas produced from low permeability reservoirs. The primary objective of the process… (more)

▼ Hydraulic Fracturing stimulation technology is used to increase the amount of oil and gas produced from low permeability reservoirs. The primary objective of the process is to increase the conductivity of the reservoir by the creation of fractures deep into the formation, changing the flow pattern from radial to linear flow. The dynamic conductivity test was used for this research to evaluate the effect of closure stress, temperature, proppant concentration, and flow back rates on fracture conductivity. The objective of performing a dynamic conductivity test is to be able to mimic actual field conditions by pumping fracturing fluid/proppant slurry fluid into a conductivity cell, and applying closure stress afterwards. In addition, a factorial design was implemented in order to determine the main effect of each of the investigated factors and to minimize the number of experimental runs. Due to the stochastic nature of the dynamic conductivity test, each experiment was repeated several times to evaluate the consistency of the results. Experimental results indicate that the increase in closure stress has a detrimental effect on fracture conductivity. This effect can be attributed to the reduction in fracture width as closure stress was increased. Moreover, the formation of channels at low proppant concentration plays a significant role in determining the final conductivity of a fracture. The presence of these channels created an additional flow path for nitrogen, resulting in a significant increase in the conductivity of the fracture. In addition, experiments performed at high temperatures and stresses exhibited a reduction in fracture conductivity. The formation of a polymer cake due to unbroken gel dried up at high temperatures further impeded the propped conductivity. The effect of nitrogen rate was observed to be inversely proportional to fracture conductivity. The significant reduction in fracture conductivity could possibly be due to the effect of polymer dehydration at higher flow rates and temperatures. However, there is no certainty from experimental results that this conductivity reduction is an effect that occurs in real fractures or whether it is an effect that is only significant in laboratory conditions. Advisors/Committee Members: Zhu, Ding (advisor), Hill, Alfred D (committee member), Sun, Yuefeng (committee member).

Subjects/Keywords: Hydraulic Fracturing; Fracture; Conductivity

…the conductivity of a proppant pack. 2 1.2 Literature Review Hydraulic Fracturing… …conductivity tests are commonly used to investigate the effects of different parameters in hydraulic… …of the fracture conductivity cell with help of hydraulic press.  Insert the bottom… …sample into the top opening of the fracture conductivity cell with help of hydraulic press… …LIST OF FIGURES Page Fig 2.1: Pumping Procedure of Dynamic Conductivity Test…

10 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Romero Lugo, J. 1. (2012). Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using The Dynamic Conductivity Test. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148364

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Romero Lugo, Jose 1985-. “Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using The Dynamic Conductivity Test.” 2012. Thesis, Texas A&M University. Accessed January 27, 2020. http://hdl.handle.net/1969.1/148364.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Romero Lugo, Jose 1985-. “Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using The Dynamic Conductivity Test.” 2012. Web. 27 Jan 2020.

Vancouver:

Romero Lugo J1. Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using The Dynamic Conductivity Test. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/1969.1/148364.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Romero Lugo J1. Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using The Dynamic Conductivity Test. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148364

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

29. Awoleke, Obadare O. Dynamic Fracture Conductivity?An Experimental Investigation Based on Factorial Analysis.

Degree: 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/149287

► This work is about fracture conductivity; how to measure and model it based on experimental data. It is also about how to determine the relative… (more)

▼ This work is about fracture conductivity; how to measure and model it based on experimental data. It is also about how to determine the relative importance of the factors that affect its magnitude and how to predict its magnitude based on these factors. We dynamically placed the slurry hereby simulating the slurry placement procedure in a field-scale fracture. We also used factorial and fractional factorial designs as the basis of our experimental investigation. The analysis and interpretation of experimental results take into account the stochastic nature of the process. We found that the relative importance of the investigated factors is dependent on the presence of outliers and how they are handled. Based on our investigation we concluded that the investigated factors arranged in order of decreasing impact on conductivity are: closure stress, polymer loading, flow back rate, presence of breaker, temperature and proppant concentration. In particular, we find that at high temperatures, fracture conductivity was severely reduced due to the formation of a dense proppant-polymer cake. Also, dehydration of the residual gel in the fracture at high flow back rates appears to cause severe damage to conductivity at higher temperatures. This represents a new way of thinking about the fracture cleanup process; not only as a displacement process, but also as a displacement and evaporative process. In engineering practice, this implies that aggressive flow back schemes are not necessarily beneficial for conductivity development. Also, we find that at low proppant concentrations, there is the increased likelihood of the formation of channels and high porosity fractures resulting in high fracture conductivities. The uniqueness of this work is a focus on the development of a conductivity model using regression analysis and also the illustration of a procedure that can be used to develop a conductivity model using dimensional analysis. We reviewed both methodologies and applied them to the challenge of modeling fracture conductivity from experimental studies. Advisors/Committee Members: Hill, A Daniel (advisor), Zhu, Ding (committee member), Lane, Robert H (committee member), Ding, Yu (committee member).

Subjects/Keywords: Dynamic fracture conductivity; fracture fluids; hydraulic fracturing; factorial analysis; regression analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Awoleke, O. O. (2013). Dynamic Fracture Conductivity?An Experimental Investigation Based on Factorial Analysis. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Awoleke, Obadare O. “Dynamic Fracture Conductivity?An Experimental Investigation Based on Factorial Analysis.” 2013. Thesis, Texas A&M University. Accessed January 27, 2020. http://hdl.handle.net/1969.1/149287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Awoleke, Obadare O. “Dynamic Fracture Conductivity?An Experimental Investigation Based on Factorial Analysis.” 2013. Web. 27 Jan 2020.

Vancouver:

Awoleke OO. Dynamic Fracture Conductivity?An Experimental Investigation Based on Factorial Analysis. [Internet] [Thesis]. Texas A&M University; 2013. [cited 2020 Jan 27]. Available from: http://hdl.handle.net/1969.1/149287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Awoleke OO. Dynamic Fracture Conductivity?An Experimental Investigation Based on Factorial Analysis. [Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Southern Illinois University

30. Lamkey, Nick C. DELINEATING CAPTURE ZONES USING A SYSTEMATIC SENSITIVITY ANALYSIS THAT VARIES RECHARGE, HYDRAULIC CONDUCTIVITY AND CONDUCTANCE.

Degree: MS, Geology, 2018, Southern Illinois University

URL: https://opensiuc.lib.siu.edu/theses/2386

► The Saline Valley Conservancy District (SVCD) formed in 1980 to provide groundwater to communities in Saline and Gallatin, Counties, Illinois. Sulfate contamination from a… (more)

▼ The Saline Valley Conservancy District (SVCD) formed in 1980 to provide groundwater to communities in Saline and Gallatin, Counties, Illinois. Sulfate contamination from a nearby coal mine threatens the SVCD’s current well field. Three of the wells are reaching the end of their service and have elevated levels of sulfate. This study investigated multiple well configurations on three different parcels of land to find possible new well locations that do not recharge water directly from the mine site over a 50-year period. A steady-state finite difference groundwater flow model was created using Graphic Groundwater GIS (Krienert and Esling, 2016), a pre and post-processor for MODFLOW (Harbaugh, 2005) and MODPATH (Pollock, 2012). The calibration and sensitivity analysis followed methods from Esling et al. (2008). Hydraulic heads were calibrated to the land surface and a systematic sensitivity analysis varied recharge, hydraulic conductivity, and drain and river conductance to produce composite capture zones. Well locations must also meet SVCD requirements that would minimize distance from current water lines and consider properties they already owned. New wells also needed to be located in areas where the aquifer exceeds 25 m thick and be separated by 305 meters to minimize drawdown. This study also considered the effects of irrigation on the aquifer. Varying recharge, hydraulic conductivity and conductance within reasonable ranges created six capture zones for the proposed wells, each with different geometries. The capture zones were superimposed onto a map to make a composite capture zone which should contain the actual capture zone for the wells. Varying conductance caused subtle changes in capture zone geometry. Low values of conductance caused particle tracks to elongate. Irrigation wells and some proposed well locations caused substantial dewatering in one area of the aquifer. The study discovered several well configurations on each of the parcels that do not source water from the mine site over 50 years. Advisors/Committee Members: Esling, Steven.

Subjects/Keywords: Capture Zones; Conductance; Hydraulic Conductivity; Recharge; Sensitivity Analsysis; Southern Illinois

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lamkey, N. C. (2018). DELINEATING CAPTURE ZONES USING A SYSTEMATIC SENSITIVITY ANALYSIS THAT VARIES RECHARGE, HYDRAULIC CONDUCTIVITY AND CONDUCTANCE. (Masters Thesis). Southern Illinois University. Retrieved from https://opensiuc.lib.siu.edu/theses/2386

Chicago Manual of Style (16^th Edition):

Lamkey, Nick C. “DELINEATING CAPTURE ZONES USING A SYSTEMATIC SENSITIVITY ANALYSIS THAT VARIES RECHARGE, HYDRAULIC CONDUCTIVITY AND CONDUCTANCE.” 2018. Masters Thesis, Southern Illinois University. Accessed January 27, 2020. https://opensiuc.lib.siu.edu/theses/2386.

MLA Handbook (7^th Edition):

Lamkey, Nick C. “DELINEATING CAPTURE ZONES USING A SYSTEMATIC SENSITIVITY ANALYSIS THAT VARIES RECHARGE, HYDRAULIC CONDUCTIVITY AND CONDUCTANCE.” 2018. Web. 27 Jan 2020.

Vancouver:

Lamkey NC. DELINEATING CAPTURE ZONES USING A SYSTEMATIC SENSITIVITY ANALYSIS THAT VARIES RECHARGE, HYDRAULIC CONDUCTIVITY AND CONDUCTANCE. [Internet] [Masters thesis]. Southern Illinois University; 2018. [cited 2020 Jan 27]. Available from: https://opensiuc.lib.siu.edu/theses/2386.

Council of Science Editors:

Lamkey NC. DELINEATING CAPTURE ZONES USING A SYSTEMATIC SENSITIVITY ANALYSIS THAT VARIES RECHARGE, HYDRAULIC CONDUCTIVITY AND CONDUCTANCE. [Masters Thesis]. Southern Illinois University; 2018. Available from: https://opensiuc.lib.siu.edu/theses/2386

Open Access Theses and Dissertations