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Texas A&M University
1.
Trimble, Sarah Margaret.
Coupling of Backbarrier Shorelines to Geomorphological Processes.
Degree: MS, Geography, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151310 
► Recent evidence suggests that backbarrier structure may act as an historical record of island development, and that backbarrier shorelines can be used as a proxy…
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▼ Recent evidence suggests that backbarrier structure may act as an historical record of island development, and that backbarrier shorelines can be used as a proxy of an island’s past and future transgressive response to sea-level rise. The structure and stability of back-barrier shorelines are dependent on the geologic framework, defined here as the combination of nearshore topography, underlying geology, and modern geomorphologic forces. This antecedent framework controls and influences the present morphology, nearshore dynamics, and rates of transgression in response to sea-level rise while also acting as a feedback to the estuary ecology on the bayside. It is therefore surprising that our understanding of backbarrier geomorphology is limited. There is a need for an established link between process regimes and an island’s geomorphological history. This thesis bridges the current intellectual gap.
The primary hypothesis of this project is that shorelines and bathymetric isolines share quantitative shape signatures indicative of their shared morphological past. To establish this link, the backbarrier shorelines of four United States National Seashores (Fire Island, NY; Assateague Island, MD; Santa Rosa Island, FL; and North Padre Island, TX) are digitized from aerial imagery using the marshline as the shoreline indicator to ensure the inclusion of (vital, sometimes inundated) ecosystems and sediment storage. The alongshore variation of this backbarrier shoreline, the mainland shoreline, lagoon bathymetry, and nearshore bathymetry are each quantified through wavelet analysis and their shape signatures are examined for spatial correspondence. Large and small scale variations are identified and attributed to the geomorphologic controls operating on the same scale and alongshore variation. The result is an improved understanding of how the geologic framework controls backbarrier shoreline shape, which is essentially an expression of the underlying geology.
Advisors/Committee Members: Houser, Christopher (advisor), Filippi, Anthony (committee member), Giardino, Richard (committee member).
Subjects/Keywords: barrier islands; coast; geomorphology; GIS; aerial photography; shoreline; coastline
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APA (6th Edition):
Trimble, S. M. (2013). Coupling of Backbarrier Shorelines to Geomorphological Processes. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151310
Chicago Manual of Style (16th Edition):
Trimble, Sarah Margaret. “Coupling of Backbarrier Shorelines to Geomorphological Processes.” 2013. Masters Thesis, Texas A&M University. Accessed April 15, 2021.
http://hdl.handle.net/1969.1/151310.
MLA Handbook (7th Edition):
Trimble, Sarah Margaret. “Coupling of Backbarrier Shorelines to Geomorphological Processes.” 2013. Web. 15 Apr 2021.
Vancouver:
Trimble SM. Coupling of Backbarrier Shorelines to Geomorphological Processes. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Apr 15].
Available from: http://hdl.handle.net/1969.1/151310.
Council of Science Editors:
Trimble SM. Coupling of Backbarrier Shorelines to Geomorphological Processes. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151310
Texas A&M University
2.
Swann, Christy Michelle.
Wind-Blown Sand: Threshold of Motion.
Degree: PhD, Geography, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153995
► The fluid threshold for wind-blown sand is the minimum shear velocity required to initiate grain movement by the force of the wind alone, and is…
(more)
▼ The fluid threshold for wind-blown sand is the minimum shear velocity required to initiate grain movement by the force of the wind alone, and is used to predict dust emission and landform change in sandy environments. R.A. Bagnold derived the most commonly cited model of the threshold from a set of wind tunnel experiments. He visually observed the fluid threshold by measuring flow conditions corresponding to the initiation of bedload movement, a mode of transport that occurs prior to saltation. His model was developed using unimodal grain size populations and requires only the average size to predict the threshold. However, field environments often exhibit non-unimodal surface populations. The fluid threshold for mixed size surfaces in fluvial environments corresponds to the coarsest grain size, not the average, resulting in a larger threshold shear velocity to initiate movement. Larger thresholds yield smaller transport rates and could explain the consistent over-prediction of aeolian transport models. Yet, the fluid threshold of mixed size sands has not been tested in an aeolian field environment. This is due to the previous inability to separate the bedload from saltation.
The purpose of this research is to test Bagnold’s model of the fluid threshold in a field environment composed of dry, naturally mixed grain sizes in Jericoacoara, Brazil. A bedload trap was designed to separate bedload from saltation, and the initiation of bedload and near surface flow conditions were measured simultaneously. Field observations were compared to Bagnold’s model as well as other models of the fluid threshold.
Observed fluid thresholds did not vary with average grain size for the mixed size population. The thresholds for finer and coarser bedload samples were approximately equal to the Bagnold-predicted threshold for coarser grains. All models tested under predicted the threshold for finer grains. These results suggest the fluid threshold for mixed size sands corresponds to the coarsest grain size fraction, similar to the results found in fluvial
Advisors/Committee Members: Sherman, Douglas (advisor), Houser, Christopher (advisor), Tchakerian, Vatche (committee member), DiMarco, Steven (committee member).
Subjects/Keywords: bed load; aeolian sand transport; surface creep
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APA (6th Edition):
Swann, C. M. (2014). Wind-Blown Sand: Threshold of Motion. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153995
Chicago Manual of Style (16th Edition):
Swann, Christy Michelle. “Wind-Blown Sand: Threshold of Motion.” 2014. Doctoral Dissertation, Texas A&M University. Accessed April 15, 2021.
http://hdl.handle.net/1969.1/153995.
MLA Handbook (7th Edition):
Swann, Christy Michelle. “Wind-Blown Sand: Threshold of Motion.” 2014. Web. 15 Apr 2021.
Vancouver:
Swann CM. Wind-Blown Sand: Threshold of Motion. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Apr 15].
Available from: http://hdl.handle.net/1969.1/153995.
Council of Science Editors:
Swann CM. Wind-Blown Sand: Threshold of Motion. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153995
Texas A&M University
3.
Lyon, Trey Saxon.
Determining the Depositional Environment of the Lower Eagle Ford Group in Lozier Canyon, Antonio Creek, and Osman Canyon: An Out Crop Study of Bedding Features a Study of Bedding Features at Outcrop Scale or in the Outcrop.
Degree: MS, Geology, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155182
► The Eagle Ford Formation is currently the most economically significant unconventional resource play in the state of Texas. There has been much debate as to…
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▼ The Eagle Ford Formation is currently the most economically significant unconventional resource play in the state of
Texas. There has been much debate as to the environment of deposition for the lowermost Facies A of the Eagle Ford in outcrop exposures in Lozier Canyon,
Texas. Two conflicting hypotheses were proposed: 1) Sedimentary structures in Facies A are hummocky cross-stratification (HCS) and swaley cross-stratification (SCS), which indicates a shelfal depositional environment above the storm wave base (SWB). 2) Sedimentary structures in Facies A are a mixture of diagenetically separated contourites, turbidites, and pinch-and-swell beds, which indicate a distal-slope depositional environment below SWB. This research used field work, three-dimensional analysis of sedimentary structures, measurements of ripple height, and laboratory analysis to interpret the environment of deposition. The results of these observations and data suggest that the sedimentary structures in Facies A record a depositional environment above SWB.
Observation of cross-bedded structures in three-dimensions reveals (i) isotropic truncation of laminae; (ii) symmetric rounded ripples; (iii) large variations in laminae geometry, truncation, and dip inclination, attributed to fluctuations in storm intensity, frequency, and duration; and (iv) and bidirectional downlap and reactivation surfaces associated with oscillatory flow above the SWB.
This study interprets cross-bedded sedimentary structures in Facies A as swaley cross-stratification (SCS) and hummocky cross-stratification (HCS) associated with storm events, and thus places Facies A in a depositional environment above storm wave-base (SWB).
Advisors/Committee Members: Giardino, John R (advisor), Laya, Juan Carlos (committee member), Pope, Mike (committee member), Houser, Christopher (committee member).
Subjects/Keywords: Eagle Ford; Boquillas; sedimentology; hummocky cross stratification; tempestite; depositional environment; outcrop; Lozier Canyon; Osman Canyon; cross bedding; cross; HCS; swaley; turbidite; contourite; West Texas
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APA (6th Edition):
Lyon, T. S. (2015). Determining the Depositional Environment of the Lower Eagle Ford Group in Lozier Canyon, Antonio Creek, and Osman Canyon: An Out Crop Study of Bedding Features a Study of Bedding Features at Outcrop Scale or in the Outcrop. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155182
Chicago Manual of Style (16th Edition):
Lyon, Trey Saxon. “Determining the Depositional Environment of the Lower Eagle Ford Group in Lozier Canyon, Antonio Creek, and Osman Canyon: An Out Crop Study of Bedding Features a Study of Bedding Features at Outcrop Scale or in the Outcrop.” 2015. Masters Thesis, Texas A&M University. Accessed April 15, 2021.
http://hdl.handle.net/1969.1/155182.
MLA Handbook (7th Edition):
Lyon, Trey Saxon. “Determining the Depositional Environment of the Lower Eagle Ford Group in Lozier Canyon, Antonio Creek, and Osman Canyon: An Out Crop Study of Bedding Features a Study of Bedding Features at Outcrop Scale or in the Outcrop.” 2015. Web. 15 Apr 2021.
Vancouver:
Lyon TS. Determining the Depositional Environment of the Lower Eagle Ford Group in Lozier Canyon, Antonio Creek, and Osman Canyon: An Out Crop Study of Bedding Features a Study of Bedding Features at Outcrop Scale or in the Outcrop. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 15].
Available from: http://hdl.handle.net/1969.1/155182.
Council of Science Editors:
Lyon TS. Determining the Depositional Environment of the Lower Eagle Ford Group in Lozier Canyon, Antonio Creek, and Osman Canyon: An Out Crop Study of Bedding Features a Study of Bedding Features at Outcrop Scale or in the Outcrop. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155182
Texas A&M University
4.
Mendez-Jimenez, Adriana.
Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize.
Degree: MS, Geography, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876
► Most large reef fish use a migratory reproductive strategy and tend to spawn in aggregations that occur at predictable locations and times. Though numerous hypotheses…
(more)
▼ Most large reef fish use a migratory reproductive strategy and tend to spawn in aggregations that occur at predictable locations and times. Though numerous hypotheses have been formulated to explain the reasons behind this phenomenon, there remain few data to evaluate the relative merits of various hypotheses. Oceanographic variables and lunar cycles are believed to drive the timing and location of this reproductive strategy. However, the dynamics of the interaction between coastal currents, water temperature, biomass concentrations, spawning site selection and gamete transport are still unclear. This study aimed to examine the influence that currents exert on gametes released at spawning aggregations of Cubera snapper Lutjanus cyanopterus (Cuvier, 1828) at Gladden Spit, Belize. It was hypothesized that surface currents flowed offshore at the time and location of spawning. However, observations from this study, using Lagrangian and Eulerian methods, indicated that eggs most likely travel westerly towards the reef and into the reef channel. The dispersal rate of eggs appeared to be explained by a power relationship, with buoyant fertilized eggs dispersing horizontally such that the area of the spawning cloud increased with time. Egg density within the spawning cloud generally decreased over time as it dispersed with the predominant surface currents. Most importantly low-cost surface drifters area an appropriate, highly replicable way to monitor surface ocean currents at spawning sides in areas where more sophisticated methods are not available. Understanding how abiotic factors influence the occurrence of multispecies spawning aggregations will lead to better conservation and management strategies in the Western Caribbean.
Advisors/Committee Members: Heyman, William D. (advisor), DiMarco, Steven F. (committee member), Houser, Christopher (committee member).
Subjects/Keywords: Spawning aggregations; Cubera snapper; Gladden Spit; surface currents; drogued surface drifters
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APA (6th Edition):
Mendez-Jimenez, A. (2012). Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876
Chicago Manual of Style (16th Edition):
Mendez-Jimenez, Adriana. “Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize.” 2012. Masters Thesis, Texas A&M University. Accessed April 15, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876.
MLA Handbook (7th Edition):
Mendez-Jimenez, Adriana. “Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize.” 2012. Web. 15 Apr 2021.
Vancouver:
Mendez-Jimenez A. Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 15].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876.
Council of Science Editors:
Mendez-Jimenez A. Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876
Texas A&M University
5.
Faloon, Anna Elizabeth.
Adapting to Hydrologic Nonstationarity in Engineering Design.
Degree: PhD, Civil Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/156295
► The engineering design discipline of hydrology and hydraulics has, for the past several decades, been largely based on probabilistic design techniques involving recurrence interval storm…
(more)
▼ The engineering design discipline of hydrology and hydraulics has, for the past several decades, been largely based on probabilistic design techniques involving recurrence interval storm and flood events. The engineering design storm and design flood have been enduring concepts; however, recently the concept of hydrologic nonstationarity has gained a foothold in engineering theory.
An analysis of the annual maxima based method of predicting engineering design storms was conducted using multiple techniques to determine whether trends were detectable or prevalent. Analyses from over 300 rain gauge stations throughout the southeastern United States showed that over 40% had experienced some form of trending behavior over time. An analysis of tropical storm contributions to station annual maxima found that such events were not overly influential with regard to extreme event prediction. Furthermore, spatial trends were not detected. These findings showed that the engineering design storm is affected by hydrologic nonstationarity.
This research also investigated several other sources of hydrologic nonstationarity – specifically, contributions from rapid urbanization, topographic subsidence, and engineering design decisions. Changes in engineering design flows from urbanization result in designs that are quickly obsolete and prone to inundation. The decisions of a design engineer can result in design flows vastly different from those predicted by hydrologic models, even when taking into account effects of suburban development. Additionally, the impacts of urban development, precipitation increase, and topographic subsidence were examined in concert in an attempt to quantify the individual impacts of each on potential flooded area. It was found that the three contributions of nonstationarity were individually quantifiable, and that the contributions from precipitation changes and topographic subsidence were the most significant sources. Land development was the least influential
contributor, though still significant.
Engineering design under changing hydrologic conditions will be one of the major challenges for the industry in the coming decades. This research examined several design techniques available in the literature and subjected them to quantitative and qualitative assessment measures to determine their performance under prevailing design assumptions. The assessment measures tentatively indicated that modular designs and designs based on the theory of ecosystem services may be most suitable under potential future hydrologic conditions.
Advisors/Committee Members: Brumbelow, Kelly (advisor), Cahill, Anthony (advisor), Wurbs, Ralph (committee member), Houser, Christopher (committee member).
Subjects/Keywords: civil engineering; hydrology; hydrologic design; nonstationarity
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APA (6th Edition):
Faloon, A. E. (2015). Adapting to Hydrologic Nonstationarity in Engineering Design. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156295
Chicago Manual of Style (16th Edition):
Faloon, Anna Elizabeth. “Adapting to Hydrologic Nonstationarity in Engineering Design.” 2015. Doctoral Dissertation, Texas A&M University. Accessed April 15, 2021.
http://hdl.handle.net/1969.1/156295.
MLA Handbook (7th Edition):
Faloon, Anna Elizabeth. “Adapting to Hydrologic Nonstationarity in Engineering Design.” 2015. Web. 15 Apr 2021.
Vancouver:
Faloon AE. Adapting to Hydrologic Nonstationarity in Engineering Design. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Apr 15].
Available from: http://hdl.handle.net/1969.1/156295.
Council of Science Editors:
Faloon AE. Adapting to Hydrologic Nonstationarity in Engineering Design. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156295
. 
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