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University of Hawaii – Manoa
1.
Paczkowski, Krystian Wojciech.
Bore impact upon vertical wall and water-driven, highmass, low-velocity debris impact.
Degree: 2016, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/101484 
► Ph.D. University of Hawaii at Manoa 2011.
This dissertation proposes a method to predict the peak lateral force on a vertical wall from an impacting…
(more)
▼ Ph.D. University of Hawaii at Manoa 2011.
This dissertation proposes a method to predict the peak lateral force on a vertical wall from an impacting bore. The formula has been developed based on the analysis of data from large-scale experimental tests on bore impact. The lateral forces are much larger than traditional lateral loads on vertical walls. It is shown, the data indicate that the formula can be used for prototype scale following Froude scaling. Additionally, a computational tsunami bore generation study utilizing the Reynolds Average Navier-Stokes equations is presented. Three bore generating scenarios are reviewed and results are presented, providing guidance on how best to generate bores for further numerical studies.
In the latter part of the dissertation, the application of a simple one-dimensional model to obtain impact force magnitude and duration, based on acoustic wave propagation in a flexible projectile, is explored. The focus herein is on in-air impact. Based on small-scale experiments, the applicability of the model to predict actual impact forces is investigated. The tests show that the force and duration are reasonably well represented by the simple model, but they also show how actual impact differs from the ideal model. The one-dimensional model is extended to consider water-driven debris as well. When fluid is used to propel the 1-D model, an estimate of the 'added mass' effect is possible. In this extended model the debris impact force depends on the wave propagation in the two media, and the conditions under which the fluid increases the impact force are discussed. The results indicate that the model provides an accurate estimation of the peak impact force and its duration. For the tested scenario, the maximum impact force does not depend on the total mass of the debris.
Subjects/Keywords: debris
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APA (6th Edition):
Paczkowski, K. W. (2016). Bore impact upon vertical wall and water-driven, highmass, low-velocity debris impact. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/101484
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Paczkowski, Krystian Wojciech. “Bore impact upon vertical wall and water-driven, highmass, low-velocity debris impact.” 2016. Thesis, University of Hawaii – Manoa. Accessed March 05, 2021.
http://hdl.handle.net/10125/101484.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Paczkowski, Krystian Wojciech. “Bore impact upon vertical wall and water-driven, highmass, low-velocity debris impact.” 2016. Web. 05 Mar 2021.
Vancouver:
Paczkowski KW. Bore impact upon vertical wall and water-driven, highmass, low-velocity debris impact. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10125/101484.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Paczkowski KW. Bore impact upon vertical wall and water-driven, highmass, low-velocity debris impact. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/101484
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
2.
Parker, Lauren E.
Meteorological conditions associated with rain-related periglacial debris flows on Mount Hood, Oregon and Mount Rainier, Washington.
Degree: MS, Geography, 2009, Oregon State University
URL: http://hdl.handle.net/1957/11967
► In November of 2006 an intense rainstorm of tropical origin, known colloquially as the "Pineapple Express," inundated the Pacific Northwest region of the United States,…
(more)
▼ In November of 2006 an intense rainstorm of tropical origin, known colloquially as the "Pineapple Express," inundated the Pacific Northwest region of the United States, initiating numerous periglacial
debris flows on several of the
stratovolcanoes in the Cascade Range of Oregon and Washington. These
debris flows rapidly aggrade channels, deposit thick sediments in their path, and severely damage infrastructure. Consequently, this work seeks to understand the potential
meteorological triggering mechanisms of these flow events.
Here we focus on Mount Hood, Oregon and Mount Rainier, Washington in the investigation of the meteorological conditions associated with rain-related periglacial
debris flow events and the variability of these conditions over time. The objectives of
this research are to assess the correlation between "Pineapple Express" and "Atmospheric River" events and rain-related
debris flows, and to explore the meteorological conditions associated with
debris flow events based on 5 parameters: storm track based on geostrophic flow patterns, temperature, precipitation and
orographic enhancement, integrated atmospheric moisture transport, and antecedent snow water equivalent (SWE).
Dates for the
debris flow events for each mountain were linked with corresponding Pineapple Express circulation and Atmospheric River events. Analysis from this work suggests that there is not a strong correlation between the occurrence of
debris flows and the occurrence of Pineapple Express or Atmospheric River events
as they are presently defined in the literature. NCEP/NCAR reanalysis data were used to determine geostrophic flow from
500h-Pa heights. Radiosonde data from Salem, Oregon and Quillayute, Washington were used to examine freezing altitudes. Precipitation data from Government Camp and Paradise meteorological stations were used to determine total rainfall amounts for rain events, and these data were compared with precipitation data from coupled lower elevation sites (Three Lynx and Longmire, respectively) to determine orographic
enhancement values for each event. Reanalysis data were again used to determine the strength and direction of atmospheric moisture transport. Snowpack Telemetry (SNOTEL) data were used to examine the antecedent snowpack conditions for each
debris flow event.
Debris flows on both Mount Hood and Mount Rainier were found to be associated with both meridional and zonal flow regimes, variable precipitation, and unimpressive orographic enhancement values. However, the
debris flow events
virtually all experienced significantly high freezing altitudes and little or negligible antecedent SWE. Further, nearly all
debris flow events were coupled with plumes of atmospheric moisture transport with high values relative to the surrounding region, implying Atmospheric River-like conditions. This finding evokes a potential need to re-examine the metrics used to classify or characterize Atmospheric Rivers, particularly through the lens of their relationship to natural hazards.
This research suggests…
Advisors/Committee Members: Nolin, Anne W. (advisor), Daly, Chris (committee member).
Subjects/Keywords: debris flows; Debris avalanches – Oregon – Hood, Mount
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APA (6th Edition):
Parker, L. E. (2009). Meteorological conditions associated with rain-related periglacial debris flows on Mount Hood, Oregon and Mount Rainier, Washington. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11967
Chicago Manual of Style (16th Edition):
Parker, Lauren E. “Meteorological conditions associated with rain-related periglacial debris flows on Mount Hood, Oregon and Mount Rainier, Washington.” 2009. Masters Thesis, Oregon State University. Accessed March 05, 2021.
http://hdl.handle.net/1957/11967.
MLA Handbook (7th Edition):
Parker, Lauren E. “Meteorological conditions associated with rain-related periglacial debris flows on Mount Hood, Oregon and Mount Rainier, Washington.” 2009. Web. 05 Mar 2021.
Vancouver:
Parker LE. Meteorological conditions associated with rain-related periglacial debris flows on Mount Hood, Oregon and Mount Rainier, Washington. [Internet] [Masters thesis]. Oregon State University; 2009. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1957/11967.
Council of Science Editors:
Parker LE. Meteorological conditions associated with rain-related periglacial debris flows on Mount Hood, Oregon and Mount Rainier, Washington. [Masters Thesis]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/11967
Clemson University
3.
Ahsanullah, Md Safwan.
A Stochastic Model for the Aerodynamics of Irregularly Shaped Gravel.
Degree: MS, Civil Engineering, 2020, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/3451
► The flight of compact debris has numerous uncertainties associated and can be highly stochastic in nature. Standard flight equations fail to take a lot…
(more)
▼ The flight of compact
debris has numerous uncertainties associated and can be highly stochastic in nature. Standard flight equations fail to take a lot of these aspects into account because of the assumption of the
debris particle being spherical in shape. This study proposes a stochastic model in an attempt to resolve some key aspects of the said uncertainties originated due to the change in orientation of the
debris particle during its flight, and as a result the alteration of the projected cross-sectional area, the lift and the drag coefficients. The model numerically solves the differential equations of motion for a large number of gravel pieces taken from five different size gradations. The amount by which the drag and lift coefficients (δC_D and δC_L), the orientation (δθ) and the projected area (δα) are varied at each time-step during the flight simulation of a single
debris are the four parameters used to fit the model to the results obtained from gravel drop experiments. An optimization criterion (ε) has been introduced and the model has been optimized individually for each gradation and globally across gradations of different gravel sizes. Upon observing the spread of the landing locations and their radial distances obtained from the model under its optimized conditions, it has been found that while the variation of lift coefficient appears to have a minimal impact on the trajectory of the particle, the change in orientation, drag coefficient and projected area are important factors to be continuously perturbed to be able to correctly track the landing locations for a sufficient number of gravel pieces. The individual optimization technique has also proven to perform better than the global optimization, which is expected as the gravel gradations are geometrically dissimilar.
Advisors/Committee Members: Nigel Kaye, Abdul Khan, William Bridges.
Subjects/Keywords: Compact debris; Debris trajectory; Gravel; Stochastic
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APA (6th Edition):
Ahsanullah, M. S. (2020). A Stochastic Model for the Aerodynamics of Irregularly Shaped Gravel. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3451
Chicago Manual of Style (16th Edition):
Ahsanullah, Md Safwan. “A Stochastic Model for the Aerodynamics of Irregularly Shaped Gravel.” 2020. Masters Thesis, Clemson University. Accessed March 05, 2021.
https://tigerprints.clemson.edu/all_theses/3451.
MLA Handbook (7th Edition):
Ahsanullah, Md Safwan. “A Stochastic Model for the Aerodynamics of Irregularly Shaped Gravel.” 2020. Web. 05 Mar 2021.
Vancouver:
Ahsanullah MS. A Stochastic Model for the Aerodynamics of Irregularly Shaped Gravel. [Internet] [Masters thesis]. Clemson University; 2020. [cited 2021 Mar 05].
Available from: https://tigerprints.clemson.edu/all_theses/3451.
Council of Science Editors:
Ahsanullah MS. A Stochastic Model for the Aerodynamics of Irregularly Shaped Gravel. [Masters Thesis]. Clemson University; 2020. Available from: https://tigerprints.clemson.edu/all_theses/3451
University of Alberta
4.
Brown, Robyn L.
Use of woody debris as an amendment for reclamation after
oil sands mining.
Degree: MS, Department of Renewable Resources, 2010, University of Alberta
URL: https://era.library.ualberta.ca/files/1c18dh19w
► This research determined if woody debris amendments facilitate land reclamation after oil sands mining. Specifically, it assessed if woody debris affects vegetation cover and richness,…
(more)
▼ This research determined if woody debris amendments
facilitate land reclamation after oil sands mining. Specifically,
it assessed if woody debris affects vegetation cover and richness,
woody species survival and abundance, soil nutrients, temperature
and water, microbial biomass carbon and mycorrhizal biomass. A four
year old site and a two year old site were used to compare
treatments with and without woody debris. Woody debris did not
affect initial vegetation emergence, but increased species richness
and decreased introduced species cover. After winter assessments
found woody debris cover positively associated with vegetation
cover. More saplings planted on woody debris treatments survived
and woody debris cover was positively associated with woody plant
abundance. Woody debris treatments had lower soil nitrogen and
higher phosphorus, suggesting nitrogen immobilization and leachate
high in phosphorus. Soil under woody debris had a lower temperature
range and higher soil volumetric water content. No differences were
found in microbial parameters.
Subjects/Keywords: Woody debris; Reclamation
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APA (6th Edition):
Brown, R. L. (2010). Use of woody debris as an amendment for reclamation after
oil sands mining. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/1c18dh19w
Chicago Manual of Style (16th Edition):
Brown, Robyn L. “Use of woody debris as an amendment for reclamation after
oil sands mining.” 2010. Masters Thesis, University of Alberta. Accessed March 05, 2021.
https://era.library.ualberta.ca/files/1c18dh19w.
MLA Handbook (7th Edition):
Brown, Robyn L. “Use of woody debris as an amendment for reclamation after
oil sands mining.” 2010. Web. 05 Mar 2021.
Vancouver:
Brown RL. Use of woody debris as an amendment for reclamation after
oil sands mining. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2021 Mar 05].
Available from: https://era.library.ualberta.ca/files/1c18dh19w.
Council of Science Editors:
Brown RL. Use of woody debris as an amendment for reclamation after
oil sands mining. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/1c18dh19w
Universiteit Utrecht
5.
Kalliantasi, I.
Estimating the total oceanic plastic content at the end of 2010.
Degree: 2015, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/318589
► The existence of regions in the ocean with a high plastic concentration is considered to be a substantial environmental problem. Although there are already initiatives…
(more)
▼ The existence of regions in the ocean with a high plastic concentration is considered to be a substantial environmental problem. Although there are already initiatives for an ocean cleanup, adequate estimates of the total surface plastic content are lacking. The main goal of this study is to determine an estimate of the total quantity of the plastic
debris in the surface ocean at the end of 2010. We combine results from waste data, an emission model and ocean tracer motion computations with the available observations to estimate parameters in the emission model. We also investigate whether representations of sinks of plastics, such as through biofouling, can improve the quality of the correlations between modeled and measured plastic concentrations. Our best estimate is that at the end of 2010, the total quantity of plastic that was present in the surface ocean was 7.4 ± 4.9 million tons.
Advisors/Committee Members: Anna S. von der Heydt, Henk A. Dijkstra.
Subjects/Keywords: plastic debris; biofouling
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APA (6th Edition):
Kalliantasi, I. (2015). Estimating the total oceanic plastic content at the end of 2010. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/318589
Chicago Manual of Style (16th Edition):
Kalliantasi, I. “Estimating the total oceanic plastic content at the end of 2010.” 2015. Masters Thesis, Universiteit Utrecht. Accessed March 05, 2021.
http://dspace.library.uu.nl:8080/handle/1874/318589.
MLA Handbook (7th Edition):
Kalliantasi, I. “Estimating the total oceanic plastic content at the end of 2010.” 2015. Web. 05 Mar 2021.
Vancouver:
Kalliantasi I. Estimating the total oceanic plastic content at the end of 2010. [Internet] [Masters thesis]. Universiteit Utrecht; 2015. [cited 2021 Mar 05].
Available from: http://dspace.library.uu.nl:8080/handle/1874/318589.
Council of Science Editors:
Kalliantasi I. Estimating the total oceanic plastic content at the end of 2010. [Masters Thesis]. Universiteit Utrecht; 2015. Available from: http://dspace.library.uu.nl:8080/handle/1874/318589
Delft University of Technology
6.
Ong, Kwee Siang (author).
Feasibility Study and Design of Soft-Catcher for Damaged Concrete Debris.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3d8be1b2-1af6-4b14-be3d-16808c2fd199
► In an accidental explosion of ammunition magazine, concrete debris throw hazard is a major safety concern. The current approach to collect explosively-damaged debris after test…
(more)
▼ In an accidental explosion of ammunition magazine, concrete
debris throw hazard is a major safety concern. The current approach to collect explosively-damaged
debris after test does not yield representative test data on
debris launch condition. This research is initiated to study the possibilities of using polymeric foam material to soft-catch concrete
debris, without inducing additional damage. Preliminary design of the soft-catcher are first performed using a modified analytical shock wave model. Numerical analyses using LS-DYNA are subsequently carried out to verify the analytical model assumptions and account the effect of rigid end backing of the soft-catcher. Following then, the
debris penetration problem is escalated into 2-D space domain, in order to include the influence of tearing resistances within the soft-catcher. The observed phenomena are eventually translated into design parameters for the soft-catcher.
Advisors/Committee Members: Sluijs, Lambertus J. (mentor), Weerheijm, Jaap (graduation committee), Bakker, Matthijs (graduation committee), Houben, Lambert (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Foam; Debris; Penetration
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APA (6th Edition):
Ong, K. S. (. (2017). Feasibility Study and Design of Soft-Catcher for Damaged Concrete Debris. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3d8be1b2-1af6-4b14-be3d-16808c2fd199
Chicago Manual of Style (16th Edition):
Ong, Kwee Siang (author). “Feasibility Study and Design of Soft-Catcher for Damaged Concrete Debris.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:3d8be1b2-1af6-4b14-be3d-16808c2fd199.
MLA Handbook (7th Edition):
Ong, Kwee Siang (author). “Feasibility Study and Design of Soft-Catcher for Damaged Concrete Debris.” 2017. Web. 05 Mar 2021.
Vancouver:
Ong KS(. Feasibility Study and Design of Soft-Catcher for Damaged Concrete Debris. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:3d8be1b2-1af6-4b14-be3d-16808c2fd199.
Council of Science Editors:
Ong KS(. Feasibility Study and Design of Soft-Catcher for Damaged Concrete Debris. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:3d8be1b2-1af6-4b14-be3d-16808c2fd199
University of Canterbury
7.
Kailey, Patrick.
Debris flows in New Zealand Alpine Catchments.
Degree: PhD, Civil Engineering, 2013, University of Canterbury
URL: http://dx.doi.org/10.26021/3427
► This research aims to improve our knowledge of debris flow occurrence and behaviour in New Zealand. Detailed field data collected in four debris flow prone…
(more)
▼ This research aims to improve our knowledge of debris flow occurrence and behaviour in New Zealand. Detailed field data collected in four debris flow prone areas in New Zealand are presented and compared. The travel distance of these events is then modelled with an empiricalstatistical model, UBCDflow, and an analytical, “equivalent fluid” continuum model DAN-W. While field studies are useful, they are often not linked to the underlying mechanics of debris flow motion or compared with the behavior of small scale flows due to the inherent complexity and unknown boundary conditions in field scale flows. Physical modelling simplifies the situation and allows boundary conditions to be controlled. The second part of this research uses physical modelling, including a series of novel debris flow tests in a geotechnical centrifuge, to compare and contrast flow behaviour and mechanics of laboratory and field scale flows. The debris flows events investigated in the field were categorized into hillslope, torrent, or intermediate-type events. Hillslope events were less channelized and progressively deposited on high slope angles. Consequently, high friction coefficients were needed to model their mobility. Torrent flows entrained more material than hillslope flows and deposited on lower angle slopes in response to unconfinement on the debris flow fan. Friction coefficients back-calculated for torrent events were lower than for the hillslope flows, but still larger than most of the friction coefficients given for large, channelized, debris flow events in the literature. Intermediate events were similar to hillslope events in terms of deposition angle and best-fit friction coefficients, but were very confined. Both UBCDflow and DAN-W were found to be useful decision support tools, but the capability of each model was limited. Greater modelling capability was gained by using the volume change behaviour predicted by UBCDflow in DAN-W, as DAN-W simulates flow heights and velocities, but does not predict the depth of erosion. In the second part of the research, a geotechnical centrifuge is used to model debris flow processes in a larger acceleration field than earth’s gravity. While centrifuges have been used to model a variety of processes in other geotechnical problems, debris flows are a relatively new phenomenon to be tested on a centrifuge. The centrifuge was successful in increasing the frictional properties of flow, but viscous forces were still the dominant form of shear stress with the materials used. Markedly different flow behaviour of tests using different pore-fluid rheologies suggested that the dominant mechanism of shear resistance may have changed between confined, downslope movement and unconfined runout. The results also showed that in geotechnical centrifuge testing, the viscosity of the pore fluid scales with the g-level, N. This research is an important step in developing centrifuge testing as an accepted method of modelling debris flow processes. Finally, a brief comparison of friction slopes between small-scale…
Subjects/Keywords: debris flow; alpine
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APA (6th Edition):
Kailey, P. (2013). Debris flows in New Zealand Alpine Catchments. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/3427
Chicago Manual of Style (16th Edition):
Kailey, Patrick. “Debris flows in New Zealand Alpine Catchments.” 2013. Doctoral Dissertation, University of Canterbury. Accessed March 05, 2021.
http://dx.doi.org/10.26021/3427.
MLA Handbook (7th Edition):
Kailey, Patrick. “Debris flows in New Zealand Alpine Catchments.” 2013. Web. 05 Mar 2021.
Vancouver:
Kailey P. Debris flows in New Zealand Alpine Catchments. [Internet] [Doctoral dissertation]. University of Canterbury; 2013. [cited 2021 Mar 05].
Available from: http://dx.doi.org/10.26021/3427.
Council of Science Editors:
Kailey P. Debris flows in New Zealand Alpine Catchments. [Doctoral Dissertation]. University of Canterbury; 2013. Available from: http://dx.doi.org/10.26021/3427
Colorado School of Mines
8.
McLain, Michael Cameron.
Estimating debris-fan compensation index and avulsion tendency using borehole-type data.
Degree: MS(M.S.), Geology and Geological Engineering, 2015, Colorado School of Mines
URL: http://hdl.handle.net/11124/20120
► Debris fans are an important landform to human development in mountainous regions. While much debris-flow research has focused on recurrence intervals and volume predictions, little…
(more)
▼ Debris fans are an important landform to human development in mountainous regions. While much
debris-flow research has focused on recurrence intervals and volume predictions, little research has focused on predicting their paths. Understanding the paths of
debris flows is important to reduce hazards to life and property. This research uses the compensation index to evaluate the likelihood of
debris path alteration by avulsion. The compensation index is a quantitative measure of the strength of compensational stacking, which is the tendency of flow events to preferentially fill topographic lows. A constraint on the use of the compensation index for
debris-flow hazard analysis is the need for large natural exposures of fan stratigraphy and the time and difficulty to map the unit boundaries. Therefore a more readily available proxy for estimating the compensation index of
debris fans was sought after in this study. Borehole data was chosen, which would also be similar to trenching data or naturally exposed small cross sections from stream erosion. The data from four previous compensation index studies was used to correlate trends in unit thickness to the compensation index based on data generated from simulated boreholes along the measured cross-sections. It was found that the central tendency and coefficient of variation of unit thickness had moderate correlation to the compensation index in both submarine and subaerial
debris fans. However, fluvial channelized floodplain data revealed no correlation to compensation index. A limited number of vertical stratigraphic sections could possibly estimate the compensation index for thousands of meters across a
debris-flow outcrop within about 0.2 of the actual compensation index. Further research is needed to corroborate these findings
Advisors/Committee Members: Santi, Paul M. (Paul Michael), 1964- (advisor), Pyles, David R. (committee member), Zhou, Wendy (committee member).
Subjects/Keywords: debris fan; debris flow hazards; compensation index; geological hazards; debris flow
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APA (6th Edition):
McLain, M. C. (2015). Estimating debris-fan compensation index and avulsion tendency using borehole-type data. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/20120
Chicago Manual of Style (16th Edition):
McLain, Michael Cameron. “Estimating debris-fan compensation index and avulsion tendency using borehole-type data.” 2015. Masters Thesis, Colorado School of Mines. Accessed March 05, 2021.
http://hdl.handle.net/11124/20120.
MLA Handbook (7th Edition):
McLain, Michael Cameron. “Estimating debris-fan compensation index and avulsion tendency using borehole-type data.” 2015. Web. 05 Mar 2021.
Vancouver:
McLain MC. Estimating debris-fan compensation index and avulsion tendency using borehole-type data. [Internet] [Masters thesis]. Colorado School of Mines; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11124/20120.
Council of Science Editors:
McLain MC. Estimating debris-fan compensation index and avulsion tendency using borehole-type data. [Masters Thesis]. Colorado School of Mines; 2015. Available from: http://hdl.handle.net/11124/20120
University of Manchester
9.
Johnson, Christopher Gurney.
Granular shocks, particle size segregation and levee
formation in avalanches and debris flows.
Degree: 2011, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122476
► Debris flows, avalanches and other geophysical mass flows pose a significant hazard to settlements in or near mountainous regions. Understanding the physical processes that govern…
(more)
▼ Debris flows, avalanches and other geophysical mass
flows pose a significant hazard to settlements in or near
mountainous regions. Understanding the physical processes that
govern these flows is an essential part of hazard assessment and
mitigation strategies. This thesis addresses two aspects of
geophysical mass flows: flow self-channelisation due to the
formation of lateral levees, and granular shocks, which occur when
a rapidly-moving
debris flow or avalanche collides with an
obstacle. We present the results of large-scale
debris flow
experiments in which the flow is channelised by coarse-particle
levees that form at the flow margins. The flow surface velocities
are measured with high speed overhead photography, and the deposits
both sampled to obtain the grain size distribution and excavated to
recover the deposited locations of tracer pebbles that were
introduced in to the flow. We propose a model, supported by
evidence from the large-scale experiments, that describes in detail
the size segregation and kinematic transport processes responsible
for the deposition of lateral levees. The second problem addressed
in the thesis concerns granular shocks, or jumps, which are rapid
changes in the depth and velocity of granular avalanches. We
investigate these through experiments in which a falling jet of
granular material impacts on an inclined plane, generating a steady
granular jump, which is either teardrop-shaped or 'blunted'.
Numerical solutions of a depth-averaged flow model agree
quantitatively with many of the observed flow features. We use this
model show that the transition between the teardrop-shaped and
blunted jump regimes corresponds to a transition between two shock
reflection structures, known as a regular and a Mach shock
reflection. On planes inclined at a shallow angle, we demonstrate a
wide variety of unsteady and channelised flows, which occur due to
the complex interaction between flowing and stationary regions of
granular material.
Advisors/Committee Members: Gray, Nico.
Subjects/Keywords: granular flow; debris flows
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APA (6th Edition):
Johnson, C. G. (2011). Granular shocks, particle size segregation and levee
formation in avalanches and debris flows. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122476
Chicago Manual of Style (16th Edition):
Johnson, Christopher Gurney. “Granular shocks, particle size segregation and levee
formation in avalanches and debris flows.” 2011. Doctoral Dissertation, University of Manchester. Accessed March 05, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122476.
MLA Handbook (7th Edition):
Johnson, Christopher Gurney. “Granular shocks, particle size segregation and levee
formation in avalanches and debris flows.” 2011. Web. 05 Mar 2021.
Vancouver:
Johnson CG. Granular shocks, particle size segregation and levee
formation in avalanches and debris flows. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Mar 05].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122476.
Council of Science Editors:
Johnson CG. Granular shocks, particle size segregation and levee
formation in avalanches and debris flows. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122476
University of Exeter
10.
Blades, L.
An exploration of debris types and their influence on wear rates in fretting.
Degree: PhD, 2020, University of Exeter
URL: http://hdl.handle.net/10871/120967
► This thesis reports on the design and subsequent use of several experiments, to explore the role of debris particles in fretting wear. In these experiments,…
(more)
▼ This thesis reports on the design and subsequent use of several experiments, to explore the role of debris particles in fretting wear. In these experiments, crossed-cylinder and annulus contacts were employed to study both the production criteria of debris particles, and their effects on subsequent wear mechanisms. These parameters are of importance in the development of the most promising modelling techniques. The experimental work consists primarily of two key studies. The first of these sought to explore how the measurable properties of debris particles (size, shape, elemental composition etc.), influenced the rate of wear. This was achieved through the variation of oxygen availability in the contact. The results indicated that the effect of oxide debris is strongly dependent on the material of the substrate, and that particle size, not hardness was the key debris parameter in determination of wear rates. The second key study investigated the effects of external loading of components on the rate of fretting wear. Crossed-cylinder specimens were held within clamps which applied large external stresses during wear experiments. This revealed that the wear rate was independent of axial tension, compression and torsion, indicating that only tractions should be used in the stress criterion for debris production modelling. Finally, work is described on a second apparatus designed to exploit the valuable intrinsic properties of annulus contacts, in the study of wear. This contact allows for precise control of the key variables (contact pressure and slip displacement), and is ideal for fundamental studies. A study on the effect of contact pressure on wear rate was performed which indicated a clear non-linearity in response.
Subjects/Keywords: Wear; Fretting; Experimental; Debris
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APA (6th Edition):
Blades, L. (2020). An exploration of debris types and their influence on wear rates in fretting. (Doctoral Dissertation). University of Exeter. Retrieved from http://hdl.handle.net/10871/120967
Chicago Manual of Style (16th Edition):
Blades, L. “An exploration of debris types and their influence on wear rates in fretting.” 2020. Doctoral Dissertation, University of Exeter. Accessed March 05, 2021.
http://hdl.handle.net/10871/120967.
MLA Handbook (7th Edition):
Blades, L. “An exploration of debris types and their influence on wear rates in fretting.” 2020. Web. 05 Mar 2021.
Vancouver:
Blades L. An exploration of debris types and their influence on wear rates in fretting. [Internet] [Doctoral dissertation]. University of Exeter; 2020. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10871/120967.
Council of Science Editors:
Blades L. An exploration of debris types and their influence on wear rates in fretting. [Doctoral Dissertation]. University of Exeter; 2020. Available from: http://hdl.handle.net/10871/120967
Texas A&M University
11.
Williams, Todd Andrew.
The Effect of DC Voltage on Fibrous Debris Bypass Through a Containment Sump Strainer.
Degree: MS, Nuclear Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158962
► Public safety has long been one of the chief design concerns for Nuclear Power Plants (NPPs). For this reason, the design of a NPP must…
(more)
▼ Public safety has long been one of the chief design concerns for Nuclear Power Plants
(NPPs). For this reason, the design of a NPP must include plans for different accident scenarios called Design Basis Accidents (DBAs). One such DBA is called a Loss of Coolant Accident (LOCA); Pressurized Water Reactors (PWRs) are particularly prone to them.
In order to better understand the phenomena associated with a LOCA, a great deal of research has been undertaken. In particular, many studies have been done under the designation Generic Safety Issue-191 (GSI-191). GSI-191 seeks to better understand the secondary effects of a LOCA such as the pressure drop and
debris bypass of the containment sump strainer and the impact that both can have on the Emergency Core Cooling System (ECCS).
The present study was undertaken to build upon previous work that sought to determine whether or not a voltage applied to the sump strainer would affect the amount of fibrous
debris bypass. To this end, a vertical strainer made from a perforated steel plate was installed in a horizontal flow loop. A filter bag was installed downstream from the strainer to collect the
debris bypass. The fibrous
debris was made from one-side baked NUKON fiberglass insulation. Measurements were also taken of the pressure drop across the
debris beds. A total of 19 tests were carried out across five different voltages.
No significant difference was observed in either the bypass or the pressure drop between the different voltages. The test results may have been affected by the fact that the present study involved water that was cooler than previous studies. The results may have also been affected by leaks in the test section. Furthermore, the use of multiple NUKON mats may also have affected the results. A study on the sensitivity of the
debris bypass to kinematic viscosity could help shed some light on the former problem.
Advisors/Committee Members: Hassan, Yassin A (advisor), Marlow, William H (committee member), King, Maria D (committee member), Ugaz, Victor M (committee member).
Subjects/Keywords: debris; bypass; GSI-191; NUKON
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APA (6th Edition):
Williams, T. A. (2016). The Effect of DC Voltage on Fibrous Debris Bypass Through a Containment Sump Strainer. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158962
Chicago Manual of Style (16th Edition):
Williams, Todd Andrew. “The Effect of DC Voltage on Fibrous Debris Bypass Through a Containment Sump Strainer.” 2016. Masters Thesis, Texas A&M University. Accessed March 05, 2021.
http://hdl.handle.net/1969.1/158962.
MLA Handbook (7th Edition):
Williams, Todd Andrew. “The Effect of DC Voltage on Fibrous Debris Bypass Through a Containment Sump Strainer.” 2016. Web. 05 Mar 2021.
Vancouver:
Williams TA. The Effect of DC Voltage on Fibrous Debris Bypass Through a Containment Sump Strainer. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1969.1/158962.
Council of Science Editors:
Williams TA. The Effect of DC Voltage on Fibrous Debris Bypass Through a Containment Sump Strainer. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158962
Texas A&M University
12.
Johnston, Travis Wayne 1987-.
Integrated Analysis and Application of Reservoir Models to Early Permian Detrital Carbonate Deposits, Midland Basin, Texas.
Degree: MS, Geology, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148147
► A 3-D seismic volume, wireline logs and core data were integrated to determine the spatial distribution of porous reservoirs within the Wolfcampian-Leonardian detrital carbonate slope…
(more)
▼ A 3-D seismic volume, wireline logs and core data were integrated to determine the spatial distribution of porous reservoirs within the Wolfcampian-Leonardian detrital carbonate slope and basin strata in Glasscock County, Texas. A 3-D seismic amplitude volume was used to construct a seismic facies analysis of the detrital carbonate section, and generated attribute volumes helped identify detrital carbonate depositional trends, as well as establish a potential correlation between thick detrital carbonate intervals and associated amplitude response.
Eight lithofacies were identified in core and were subsequently classified into three main facies:
debris flow, grain flow/turbidite, and basinal shale. A facies type log was then created, which was used to supervise the creation of facies logs within other wells to ultimately use in the creation of a 3-D facies model. Cross sections through the study area show an increase in bathymetric relief beginning in Wolfcampian time and continuing through the Leonardian. Detrital carbonate deposition increases dramatically during the Leonardian, consisting of large gravity flows deposited basinward in a northwest-southeast linear trend, rapidly thinning basinward. Individual flows are discontinuous and bounded by basinal shale facies.
Four seismic facies were identified within the interval of interest using a structurally smoothed attribute volume, while an RMS amplitude attribute volume provided a correlation between high RMS amplitude values and detrital carbonate thickness. A high RMS amplitude value corresponding to the
debris flow facies was extracted from the RMS attribute volume in the form of a seismic geobody.
Two facies models and one porosity model were generated by using upscaled values from the gamma ray, total porosity, and lithofacies logs, which were applied over areas with the densest well control. Although the facies model populated from upscaled GR values was useful in stratigraphic interpretation, it is determined that the models should be applied over areas with denser well spacing in order to provide a more accurate and geologically viable subsurface model.
Advisors/Committee Members: Pope, Michael C (advisor), Mancini, Ernest A (committee member), Schechter, David S (committee member), Sun, Yuefeng (committee member).
Subjects/Keywords: Midland Basin; debris flow; Wolfcampian
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APA (6th Edition):
Johnston, T. W. 1. (2012). Integrated Analysis and Application of Reservoir Models to Early Permian Detrital Carbonate Deposits, Midland Basin, Texas. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148147
Chicago Manual of Style (16th Edition):
Johnston, Travis Wayne 1987-. “Integrated Analysis and Application of Reservoir Models to Early Permian Detrital Carbonate Deposits, Midland Basin, Texas.” 2012. Masters Thesis, Texas A&M University. Accessed March 05, 2021.
http://hdl.handle.net/1969.1/148147.
MLA Handbook (7th Edition):
Johnston, Travis Wayne 1987-. “Integrated Analysis and Application of Reservoir Models to Early Permian Detrital Carbonate Deposits, Midland Basin, Texas.” 2012. Web. 05 Mar 2021.
Vancouver:
Johnston TW1. Integrated Analysis and Application of Reservoir Models to Early Permian Detrital Carbonate Deposits, Midland Basin, Texas. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1969.1/148147.
Council of Science Editors:
Johnston TW1. Integrated Analysis and Application of Reservoir Models to Early Permian Detrital Carbonate Deposits, Midland Basin, Texas. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148147
Texas A&M University
13.
Plumlee, Kevin Grant.
An Investigation into the Wear Behavior and Debris Particle Formation of Ultra-High Molecular Weight Polyethylene.
Degree: PhD, Mechanical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/173558
► Ultra-high molecular weight polyethylene (UHMWPE) is a popular choice for bearing material due to its low wear and low friction coefficient. It remains the primary…
(more)
▼ Ultra-high molecular weight polyethylene (UHMWPE) is a popular choice for bearing material due to its low wear and low friction coefficient. It remains the primary material for use in artificial joints, which has led to an extensive history of tribologic study, and has resulted in a variety of techniques for reducing total wear volume. However, very little is known regarding the actual mechanisms that lead to individual
debris particle formation. Applying well-established wear testing techniques specifically to explore UHWMPE wear mechanisms may open new insights and new possibilities for engineering long lasting joints
.
First, wear
debris image analysis was applied to
debris collected after UHMWPE pins were worn against counterfaces of three different roughnesses, and then imaged in a scanning electron microscope. The
debris was characterized using standard analysis techniques: equivalent circle diameter (ECD), roundness factor, and Richardson fractal dimension. Results revealed evidence of abrasion, adhesion and fatigue processes, but a large percentage of particles were small and smooth, and were not easily classified. It is hypothesized that these particles are the result of plastic deformation at the wear interface.
Analysis of the resultant wear surface of UHMWPE samples is also suggestive of plastic deformation, including an often observed but never explained ripple pattern. Computer modeling supports the notion that deformation takes place at the surface, which led to the conclusion that a thin layer of strained polymer can buckle during relaxation, resulting in a rippled geometry. In this case, the final ripple wavelength would be determined by the thickness of the deformed layer.
To test this hypothesis, computer models were used to predict the effects of contact pressure, temperature, and counterface roughness on the rippled surface geometry. Corresponding experimental tests did reveal high levels of plastic deformation, but in much thinner sections than anticipated. Additionally, the experimental effects of pressure and temperature did not match the simulations and suggested that the ripple formations are more dynamic than previously thought, and are the result of a thin, self-adhering transfer film rather than straining of the bulk polymer itself.
Advisors/Committee Members: Hogan, Harry (advisor), Liang, Hong (committee member), Sue, H.J. (committee member), Grunlan, Melissa (committee member).
Subjects/Keywords: Wear; UHMWPE; Wear Debris Analysis
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Export
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APA (6th Edition):
Plumlee, K. G. (2018). An Investigation into the Wear Behavior and Debris Particle Formation of Ultra-High Molecular Weight Polyethylene. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173558
Chicago Manual of Style (16th Edition):
Plumlee, Kevin Grant. “An Investigation into the Wear Behavior and Debris Particle Formation of Ultra-High Molecular Weight Polyethylene.” 2018. Doctoral Dissertation, Texas A&M University. Accessed March 05, 2021.
http://hdl.handle.net/1969.1/173558.
MLA Handbook (7th Edition):
Plumlee, Kevin Grant. “An Investigation into the Wear Behavior and Debris Particle Formation of Ultra-High Molecular Weight Polyethylene.” 2018. Web. 05 Mar 2021.
Vancouver:
Plumlee KG. An Investigation into the Wear Behavior and Debris Particle Formation of Ultra-High Molecular Weight Polyethylene. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1969.1/173558.
Council of Science Editors:
Plumlee KG. An Investigation into the Wear Behavior and Debris Particle Formation of Ultra-High Molecular Weight Polyethylene. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173558
University of Manchester
14.
Johnson, Christopher Gurney.
Granular shocks, particle size segregation and levee formation in avalanches and debris flows.
Degree: PhD, 2011, University of Manchester
URL: https://www.research.manchester.ac.uk/portal/en/theses/granular-shocks-particle-size-segregation-and-levee-formation-in-avalanches-and-debris-flows(a90bcaa3-a056-4691-bc8d-de7b484e2590).html
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542698
► Debris flows, avalanches and other geophysical mass flows pose a significant hazard to settlements in or near mountainous regions. Understanding the physical processes that govern…
(more)
▼ Debris flows, avalanches and other geophysical mass flows pose a significant hazard to settlements in or near mountainous regions. Understanding the physical processes that govern these flows is an essential part of hazard assessment and mitigation strategies. This thesis addresses two aspects of geophysical mass flows: flow self-channelisation due to the formation of lateral levees, and granular shocks, which occur when a rapidly-moving debris flow or avalanche collides with an obstacle. We present the results of large-scale debris flow experiments in which the flow is channelised by coarse-particle levees that form at the flow margins. The flow surface velocities are measured with high speed overhead photography, and the deposits both sampled to obtain the grain size distribution and excavated to recover the deposited locations of tracer pebbles that were introduced in to the flow. We propose a model, supported by evidence from the large-scale experiments, that describes in detail the size segregation and kinematic transport processes responsible for the deposition of lateral levees. The second problem addressed in the thesis concerns granular shocks, or jumps, which are rapid changes in the depth and velocity of granular avalanches. We investigate these through experiments in which a falling jet of granular material impacts on an inclined plane, generating a steady granular jump, which is either teardrop-shaped or 'blunted'. Numerical solutions of a depth-averaged flow model agree quantitatively with many of the observed flow features. We use this model show that the transition between the teardrop-shaped and blunted jump regimes corresponds to a transition between two shock reflection structures, known as a regular and a Mach shock reflection. On planes inclined at a shallow angle, we demonstrate a wide variety of unsteady and channelised flows, which occur due to the complex interaction between flowing and stationary regions of granular material.
Subjects/Keywords: 624.15; granular flow; debris flows
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APA (6th Edition):
Johnson, C. G. (2011). Granular shocks, particle size segregation and levee formation in avalanches and debris flows. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/granular-shocks-particle-size-segregation-and-levee-formation-in-avalanches-and-debris-flows(a90bcaa3-a056-4691-bc8d-de7b484e2590).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542698
Chicago Manual of Style (16th Edition):
Johnson, Christopher Gurney. “Granular shocks, particle size segregation and levee formation in avalanches and debris flows.” 2011. Doctoral Dissertation, University of Manchester. Accessed March 05, 2021.
https://www.research.manchester.ac.uk/portal/en/theses/granular-shocks-particle-size-segregation-and-levee-formation-in-avalanches-and-debris-flows(a90bcaa3-a056-4691-bc8d-de7b484e2590).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542698.
MLA Handbook (7th Edition):
Johnson, Christopher Gurney. “Granular shocks, particle size segregation and levee formation in avalanches and debris flows.” 2011. Web. 05 Mar 2021.
Vancouver:
Johnson CG. Granular shocks, particle size segregation and levee formation in avalanches and debris flows. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Mar 05].
Available from: https://www.research.manchester.ac.uk/portal/en/theses/granular-shocks-particle-size-segregation-and-levee-formation-in-avalanches-and-debris-flows(a90bcaa3-a056-4691-bc8d-de7b484e2590).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542698.
Council of Science Editors:
Johnson CG. Granular shocks, particle size segregation and levee formation in avalanches and debris flows. [Doctoral Dissertation]. University of Manchester; 2011. Available from: https://www.research.manchester.ac.uk/portal/en/theses/granular-shocks-particle-size-segregation-and-levee-formation-in-avalanches-and-debris-flows(a90bcaa3-a056-4691-bc8d-de7b484e2590).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542698
Delft University of Technology
15.
Engwerda, H.J.A. (author).
Remote Sensing for Spatial Electrostatic Characterization using the Multi-Sphere Method.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:37ee82df-d533-41fb-b6b8-a803c939cc4f
► Focusing on the rapidly increasing debris population around Earth as well as the scientific and corporate interest in Asteroids, multiple missions for interaction with non-cooperative…
(more)
▼ Focusing on the rapidly increasing debris population around Earth as well as the scientific and corporate interest in Asteroids, multiple missions for interaction with non-cooperative bodies have been proposed over the last years. Applications such as the Electrostatic Tractor (ET) aiming to reduce the debris populations and missions introducing close proximity or even berthing with bodies in space all require knowledge about the electrostatic characteristics of the target. In order to infer this information in a real-time manner, the Remote Sensing for Electrostatic Characterization (RSEC) method can be applied. By measuring the ambient potential with probes extended from a dedicated spacecraft, an optimization can be performed as to find a best-fit Multi-Sphere Method (MSM) model. onsisting of a set of spheres with a point charge in their middle, this model approximates both the charge and potential of the rotating target. Comparing the in-situ measured potential with the potential obtained from the MSM model, the accuracy of the MSM model can be found and with it the model can be optimized. This thesis provides an extension of the RSEC method to three-dimensional space allowing for multi-axis tumbling motions of the target. Furthermore, simplifications of the model allowing for greater computational speed and simpler application are discussed. In order to validate the model, a Finite Element Analysis (FEA) is performed allowing the RSEC method to be tested for a representative missions scenario where the ET is applied. Based on the results of the FEA simulation, a Surface-MSM (SMSM) is constructed, allowing for multi-axis rotations of the debris, where this would be too computationally expensive with a FEA. The accuracy of force prediction within the ET method is assessed for a representative debris model. Furthermore, insights are offered in the effect of varying model parameters, and the influence of force mis-prediction on reorbiting time and fuel cost is evaluated.
Aerospace Engineering
Space Engineering
Space Flight
Advisors/Committee Members: Sundaramoorthy, P.P. (mentor).
Subjects/Keywords: electrostatic; space debris; sensing
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APA (6th Edition):
Engwerda, H. J. A. (. (2017). Remote Sensing for Spatial Electrostatic Characterization using the Multi-Sphere Method. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:37ee82df-d533-41fb-b6b8-a803c939cc4f
Chicago Manual of Style (16th Edition):
Engwerda, H J A (author). “Remote Sensing for Spatial Electrostatic Characterization using the Multi-Sphere Method.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:37ee82df-d533-41fb-b6b8-a803c939cc4f.
MLA Handbook (7th Edition):
Engwerda, H J A (author). “Remote Sensing for Spatial Electrostatic Characterization using the Multi-Sphere Method.” 2017. Web. 05 Mar 2021.
Vancouver:
Engwerda HJA(. Remote Sensing for Spatial Electrostatic Characterization using the Multi-Sphere Method. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:37ee82df-d533-41fb-b6b8-a803c939cc4f.
Council of Science Editors:
Engwerda HJA(. Remote Sensing for Spatial Electrostatic Characterization using the Multi-Sphere Method. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:37ee82df-d533-41fb-b6b8-a803c939cc4f
University of Florida
16.
Scruggs, Thomas A.
Average Cross-sectional Area Calculation of DebriSat Fragments.
Degree: MS, Aerospace Engineering - Mechanical and Aerospace Engineering, 2017, University of Florida
URL: https://ufdc.ufl.edu/UFE0051111
► DebriSat is an ongoing effort at the University of Florida whose goal is to update the satellite standard breakup model used by the DOD and…
(more)
▼ DebriSat is an ongoing effort at the University of Florida whose goal is to update the satellite standard breakup model used by the DOD and NASA. In 2014 a representative 50 kg class satellite was subjected to a hypervelocity impact and the
debris from the impact is currently being characterized by the University of Florida. One of the key parameters in the standard breakup model is average cross-sectional area due to its use in determining the orbit lifetime of
debris fragments. Average cross-sectional area is defined as the average projected surface area of an object when viewed equally over four pi steradians.
Advisors/Committee Members: FITZ-COY,NORMAN G (committee chair).
Subjects/Keywords: debris – debrisat – measurement – space
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APA (6th Edition):
Scruggs, T. A. (2017). Average Cross-sectional Area Calculation of DebriSat Fragments. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0051111
Chicago Manual of Style (16th Edition):
Scruggs, Thomas A. “Average Cross-sectional Area Calculation of DebriSat Fragments.” 2017. Masters Thesis, University of Florida. Accessed March 05, 2021.
https://ufdc.ufl.edu/UFE0051111.
MLA Handbook (7th Edition):
Scruggs, Thomas A. “Average Cross-sectional Area Calculation of DebriSat Fragments.” 2017. Web. 05 Mar 2021.
Vancouver:
Scruggs TA. Average Cross-sectional Area Calculation of DebriSat Fragments. [Internet] [Masters thesis]. University of Florida; 2017. [cited 2021 Mar 05].
Available from: https://ufdc.ufl.edu/UFE0051111.
Council of Science Editors:
Scruggs TA. Average Cross-sectional Area Calculation of DebriSat Fragments. [Masters Thesis]. University of Florida; 2017. Available from: https://ufdc.ufl.edu/UFE0051111
University of Melbourne
17.
Perera, Shihara.
Modelling impact actions of flying and falling objects.
Degree: 2017, University of Melbourne
URL: http://hdl.handle.net/11343/194798
► Building components, including roof claddings, glass facades, columns, and walls, exposed to rockfall hazard need to be designed to resist the impact actions of flying…
(more)
▼ Building components, including roof claddings, glass facades, columns, and walls, exposed to rockfall hazard need to be designed to resist the impact actions of flying or falling objects, including hailstones, windborne debris and other types of soft, or hard, impactor material. At present, the performance of target structures in response to impact action is normally determined by (i) costly and limited pass/fail prototype testing, (ii) numerical simulation methods, or by (iii) highly simplified calculations based on treating the impact action as an equivalent static force that cannot be generalised to different systems and materials.
The modelling of transient actions of wind gusts, blasts and earthquakes is well supported by aerodynamics and ground motion software, which enables the forcing function to be estimated for given hazard scenarios. However, the loading function cannot be predefined in an impact scenario as much depends on the interaction between the debris object and the target being struck.
An impact action can be resolved into the localised contact force and the global deflection demand (i.e. impulsive effects) of the impact. The amount of contact force generated by the impact is an important quantity as it controls the level of damage to the target being struck. Common calculation methods based on energy principles can only be used to quantify the impulsive effects of the impact but not the contact force. The harder the impactor material, the shorter the duration of the contact, and, hence, the higher the amplitude of the contact force in delivering a given amount of momentum from the impact.
This research presents a new approach to the analysis of impact actions, and the main thrust of the research project is on the localised contact force. The research tasks are mainly about establishing and validating the methods of modelling the risk of damage and failure of the target components that form part of the building envelope exposed to impact hazards. Impactor specimens are made of ice (simulating hail impact), timber, concrete and brick specimens simulating storm debris impacts. The modelling procedure is first undertaken to obtain results in deterministic terms to be followed up by probabilistic modelling. The deterministic component of the research is to determine the impact generated deflection, indentation, and contact force demand behaviour based on experimentation, which makes use of idealised spherical impactor specimens. The probabilistic component of the research is to model random variations in the shape of the impactor and the effects of those variations on the impact behaviour, and to simulate threat scenarios by the use of calibrated models.
The procedure presented in this research is to first test the impactor specimens dynamically on their own (without the target structure) on a custom-built device to obtain key information concerning the dynamic compressive stiffness parameters controlling the contact force. Experiments could therefore be repeated to cover various types of…
Subjects/Keywords: Impact; Hailstones; Windborne Debris
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APA (6th Edition):
Perera, S. (2017). Modelling impact actions of flying and falling objects. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/194798
Chicago Manual of Style (16th Edition):
Perera, Shihara. “Modelling impact actions of flying and falling objects.” 2017. Doctoral Dissertation, University of Melbourne. Accessed March 05, 2021.
http://hdl.handle.net/11343/194798.
MLA Handbook (7th Edition):
Perera, Shihara. “Modelling impact actions of flying and falling objects.” 2017. Web. 05 Mar 2021.
Vancouver:
Perera S. Modelling impact actions of flying and falling objects. [Internet] [Doctoral dissertation]. University of Melbourne; 2017. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11343/194798.
Council of Science Editors:
Perera S. Modelling impact actions of flying and falling objects. [Doctoral Dissertation]. University of Melbourne; 2017. Available from: http://hdl.handle.net/11343/194798
University of Hong Kong
18.
Jing, Lu.
Segregation, runout and
deposition in debris flow.
Degree: 2017, University of Hong Kong
URL: http://hdl.handle.net/10722/241402
► Debris flow is one of the most destructive natural hazards due to its high mobility and long runout. The prediction of its runout distance, deposit…
(more)
▼ Debris flow is one of the most destructive
natural hazards due to its high mobility and long runout. The
prediction of its runout distance, deposit area, and impact
pressure on structure are of great importance to hazard mitigation
(e.g. the design of debris-resisting barriers). The deposit
morphology of debris flow is largely affected by particle-scale
mechanisms, such as size segregation. Segregation leads to
boulder-rich front and self-formed lateral levees that enhance
runout distance. From the macroscopic perspective, rheological
properties are controlling parameters for depositional
characteristics. Due to the multi-phase and multi-scale nature of
debris flow, this thesis employs both continuum and discrete
approaches to add in-depth understanding to the processes of
segregation, runout and deposition.
Size segregation is studied
using discrete element method (DEM). A parametric study shows how
size ratio, slope angle, volume concentration and inter-particle
friction affect the progress and maximum extent of segregation.
Statistical analyses link DEM data to the state-of-the-art
continuum theory of segregation, which confirms the theoretical
consideration that the excess pressure taken by large particles
drives their upward movements. A migration mechanism is proposed
for large particles: unlike small particles dropping through voids
without enduring contacts, large particles undergo more endurable
contacts within crowded and anisotropic contact networks; they are
subject to shear due to the surface-driven velocity gradient, and
are expulsed with necessary rotations. Moreover, since non-slip
condition is crucial to the modelling of segregation with DEM, a
roughness parameter Ra is proposed to characterise base roughness.
A phase transition from slip (Ra < 0.51) to non-slip (Ra >
0.62) regimes is observed with this parameter.
Runout and
deposition are studied in computational fluid dynamics (CFD) with
homogeneous viscoplastic models, which are more relevant to debris
flow with high contents of water and fines. Focus is laid on the
effect of rheological parameters, i.e. yield stress and viscosity.
Numerical results, which are validated against small-scale flume
experiments, show that the rapid deposition of debris flow is due
to relatively low viscosity, resulting in elongated deposit
morphology; high yield stress leads to thick deposits and steep
edges. Runout scaling from laboratory to field is established
taking yield stress and viscosity into consideration.
To
understand fluid–particle interactions in debris flow, a numerical
framework coupling DEM and CFD is developed, incorporating the
volume of fluid (VOF) scheme to track the dynamics of free fluid
surface. With the coupled CFD–DEM model, good agreement is achieved
in the simulation of a three-phase (i.e. air, water, solid)
dambreak experiment. This model will exploit the strengths of both
DEM and CFD to explore the interplay between granular segregation
and fluid rheology. Future work will focus on developing
constitutive models that bridge…
Subjects/Keywords: Debris
avalanches
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Manager
APA (6th Edition):
Jing, L. (2017). Segregation, runout and
deposition in debris flow. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/241402
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jing, Lu. “Segregation, runout and
deposition in debris flow.” 2017. Thesis, University of Hong Kong. Accessed March 05, 2021.
http://hdl.handle.net/10722/241402.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jing, Lu. “Segregation, runout and
deposition in debris flow.” 2017. Web. 05 Mar 2021.
Vancouver:
Jing L. Segregation, runout and
deposition in debris flow. [Internet] [Thesis]. University of Hong Kong; 2017. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10722/241402.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jing L. Segregation, runout and
deposition in debris flow. [Thesis]. University of Hong Kong; 2017. Available from: http://hdl.handle.net/10722/241402
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of North Texas
19.
Dewoody, Dale W.
Road Debris.
Degree: 2012, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc115068/
► This dissertation comprises two parts: Part I, which discusses the growing trend in project books in contemporary poetry, and Part II, a collection of poems…
(more)
▼ This dissertation comprises two parts: Part I, which discusses the growing trend in project books in contemporary poetry, and Part II, a collection of poems titled, Road
Debris. There is an increasing trend in the number of project books, which are collections of poetry unified in both thematic and formal ways. the individual poems in a project book share overt connections which allow the book to work on many different levels, blending elements of fiction and non-fiction or sharing a specific theme or speaker. While these books have the advantage of being easily memorable, which might gain poets an edge in book contests, there are also many risks involved. the main issue surrounding project books is if the individual poems can justify the book, or do they seem too repetitive or forced. As more poets, especially newer ones, try to use the project book as a shortcut to publication, it can result in poorly written poems forced to fit into a particular concept. By examining three successful cotemporary project books—The Quick of It, by Eamon Grennan; Incident Light, by H. L. Hix; and Romey’s Order by Astory Riley—this essay discusses how these books work in order to understand the potential of the project book. All of these books work in distinctly different ways, yet they all fall into the category of project book. While project books will inevitably result in poor imitations, it allows books of poetry to expand and explore in different directions.
Advisors/Committee Members: Marks, Corey, Bond, Bruce, Fairchild, B. H..
Subjects/Keywords: Road debris; poetry; project books
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University of Cambridge
20.
Read, Matthew James.
The effect of wide-orbit planets on inner planetary systems and debris.
Degree: PhD, 2018, University of Cambridge
URL: https://doi.org/10.17863/CAM.24314
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744929
► Planetary systems around other stars have been observed to be far more diverse than what would be expected from the example of the Solar System.…
(more)
▼ Planetary systems around other stars have been observed to be far more diverse than what would be expected from the example of the Solar System. Exoplanets have been detected with a wide range of sizes and separations from the host star, with a range of orbital properties including large eccentricities and small inter-planet mutual inclinations. How representative these planetary systems are, however, is unclear due to detection techniques being more sensitive to planets on close orbits around the host star. It is possible therefore that a population of wide-orbit planets could be present in these systems and be evading detection. These planets may play a significant role in forming and shaping planetary systems, resulting in the architecture that is observed today. Currently, one of the major ways of inferring the presence of wide-orbit planets, besides directly detecting them, is to consider the dynamical impact they would have on known planets. In the first part of this thesis I consider how the eccentricities of known planets are affected due to long term dynamical interactions with a wide-orbit planet. I show that the eccentricity of a known planet in a system can periodically be significantly increased due to these interactions, provided that there are a total of two planets in the system. For systems with multiple known planets I show that the inner planets can protect each other against long term eccentricity perturbations from a wide-orbit planet. Following on from this investigation, I show how the inclinations of planets are affected due to long term interactions with a wide-orbit planet. Specifically, I consider how this interaction affects the probability that planetary systems are observed to transit. I find that the presence of wide-orbit planets in transiting planetary systems can help explain the so-called `Kepler-Dichotomy' which describes the apparent excess of observed single transiting systems compared with multi-planet transiting systems. Wide-orbit planets do not just dynamically interact with other planets in a system but also with small debris type bodies, akin to the Asteroid and Kuiper belts in the Solar System. In the second half of this thesis, I consider the planetary system HR8799 which is known to host four planets and two populations of debris which lie both internally and externally to the known planets. I find, through suites of N-body simulations, that a hypothetical planet in HR8799 sculpts an outer debris population that agrees more strongly with observations, compared with what would be expected by considering the known planets in isolation. Finally, for the last part of this thesis, I describe a survey that is looking to observe wide-orbit planets in close-by planetary systems directly. The observations and analysis for this survey is currently on-going, however I show preliminary results including systems with and without potential companion detections.
Subjects/Keywords: 523.2; Planets; Dynamics; Debris; Observations
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APA (6th Edition):
Read, M. J. (2018). The effect of wide-orbit planets on inner planetary systems and debris. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.24314 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744929
Chicago Manual of Style (16th Edition):
Read, Matthew James. “The effect of wide-orbit planets on inner planetary systems and debris.” 2018. Doctoral Dissertation, University of Cambridge. Accessed March 05, 2021.
https://doi.org/10.17863/CAM.24314 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744929.
MLA Handbook (7th Edition):
Read, Matthew James. “The effect of wide-orbit planets on inner planetary systems and debris.” 2018. Web. 05 Mar 2021.
Vancouver:
Read MJ. The effect of wide-orbit planets on inner planetary systems and debris. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Mar 05].
Available from: https://doi.org/10.17863/CAM.24314 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744929.
Council of Science Editors:
Read MJ. The effect of wide-orbit planets on inner planetary systems and debris. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.24314 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744929
Colorado State University
21.
Patton, Annette.
Upland processes and controls on September 2013 debris flows, Rocky Mountain National Park, Colorado.
Degree: MS(M.S.), Geosciences, 2016, Colorado State University
URL: http://hdl.handle.net/10217/176664
► More than 10 large debris flows occurred in and near Rocky Mountain National Park (RMNP) following the spatially extensive September 2013 rainstorm in the Colorado…
(more)
▼ More than 10 large
debris flows occurred in and near Rocky Mountain National Park (RMNP) following the spatially extensive September 2013 rainstorm in the Colorado Front Range. These
debris flows delivered sediment to valley bottoms and had the potential to damage infrastructure and endanger park visitors and staff. To characterize conditions of
debris flow initiation when known thresholds of elevation, slope angle, and rainfall intensity are met, 11
debris flow sites in RMNP were surveyed. Slope variables including soil depth, soil texture, and slope morphology were compared between 11 failed and 30 undisturbed hillslopes (control sites) that were exposed to similar cumulative rainfall during the 2013 storm. Analysis of measured slope variables indicates that slope morphology is strongly related to
debris flow occurrence. Four of the 11 surveyed
debris flows initiated in or immediately below a colluvial hollow (a topographic concavity on a hillslope), while only 1/30 control sites were located near a colluvial hollow. Furthermore, 8/11 surveyed
debris flows initiated in areas of convergent topography (including colluvial hollows and areas of broader convergence), while only 3/30 control slopes were convergent. The differences in these proportions suggest that hillslopes characterized by a colluvial hollow or other convergent topography accumulate surface and groundwater flow and collect unconsolidated material. Convergent hillslopes are therefore more susceptible to slope failure during rain events of sufficient intensity and/or duration. The other geomorphic hillslope variables evaluated in this study did not demonstrate statistically significant differences between
debris flow sites and control sites. In some cases, small sample size or other data constraints may provide limited ability to discern geomorphic differences between
debris flows and control sites. The Bighorn site, a large
debris flow near an historic structure in RMNP, was selected for detailed geochronologic study to determine the ages of old
debris deposits and evaluate
debris flow frequency. Several numeric and relative dating techniques were applied to determine the age of pre-2013
debris deposits at this site. Numeric dating techniques included radiocarbon analysis of organic material and 10Be radionuclide analysis of boulders collected from four
debris flow levees. 10Be exposure dating has not previously been applied to
debris flow surfaces. Mapping of
debris flow levees and stratigraphic study at the Bighorn
debris flow site confirm that at least 2-3 and possibly more
debris flows have occurred at this site within the last 102-103 years. The recurrence of
debris flows at this site indicates that it may experience similar mass movements in the future. A boulder sample collected from the 2013
debris flow levee returned an 18.1 ka 10Be exposure age. Ranges of exposure ages for three older
debris deposits are 54.2, 143, and 121 ka. The falsely old age of the 2013 sample and the wide range of ages determined for each of the older landforms…
Advisors/Committee Members: Rathburn, Sara (advisor), Wohl, Ellen (committee member), Niemann, Jeffrey (committee member), Bilderback, Eric (committee member).
Subjects/Keywords: debris flow; Colorado Front Range
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APA (6th Edition):
Patton, A. (2016). Upland processes and controls on September 2013 debris flows, Rocky Mountain National Park, Colorado. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/176664
Chicago Manual of Style (16th Edition):
Patton, Annette. “Upland processes and controls on September 2013 debris flows, Rocky Mountain National Park, Colorado.” 2016. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/176664.
MLA Handbook (7th Edition):
Patton, Annette. “Upland processes and controls on September 2013 debris flows, Rocky Mountain National Park, Colorado.” 2016. Web. 05 Mar 2021.
Vancouver:
Patton A. Upland processes and controls on September 2013 debris flows, Rocky Mountain National Park, Colorado. [Internet] [Masters thesis]. Colorado State University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/176664.
Council of Science Editors:
Patton A. Upland processes and controls on September 2013 debris flows, Rocky Mountain National Park, Colorado. [Masters Thesis]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/176664
Colorado School of Mines
22.
Dowling, Casey Alexander.
Analysis of global debris-flow fatalities and related socioeconomic factors from 1950 to 2011, An.
Degree: MS(M.S.), Geology and Geological Engineering, 2013, Colorado School of Mines
URL: http://hdl.handle.net/11124/78297
► Debris flows cause significant damage and fatalities throughout the world. However, some debris flows only take a few victims, while others kill hundreds, and the…
(more)
▼ Debris flows cause significant damage and fatalities throughout the world. However, some
debris flows only take a few victims, while others kill hundreds, and the differences between these events is not well understood. This study addresses the overall impacts of
debris flows on a global scale from 1950 to 2011. Two hundred fourteen events with 77,788 fatalities were recorded from academic publications, newspapers, and personal correspondence. Spatial, temporal, and physical characteristics were documented and evaluated. In addition, multiple socioeconomic indicators were reviewed and statistically analyzed to evaluate if vulnerable populations are disproportionately affected by
debris flows. This research provides evidence that populations with lower social, political, or economical standing are more at risk for
debris-flow related fatality. Specifically, higher levels of fatalities tend to occur in developing countries, characterized by less wealth, more corrupt governments, and weaker healthcare systems. The median number of deaths per flow in developing countries is 23, but only 6 in advanced countries. The analysis also indicates that
debris flow occurrence and deadliness is affected by seasonal precipitation patterns, as the most common trigger for fatal events has been found to be extreme precipitation, particularly in the form of large seasonal events like cyclones and monsoon storms. Rainfall caused or triggered 144 of the 214 fatal
debris flows within the database. However, it is the more uncommon and catastrophic triggers, such as earthquakes, and landslide dam bursts that tend to create more deadly
debris flows, with a median fatality count greater than 500 while rainfall induced
debris flows have a median fatality rate of only 9 per event.
Advisors/Committee Members: Santi, Paul M. (Paul Michael), 1964- (advisor), Higgins, Jerry D. (committee member), Zhou, Wendy (committee member).
Subjects/Keywords: disaster of social vulnerabilty; debris flow; geohazard; Debris avalanches; Debris avalanches – Economic aspects; Debris avalanches – Social aspects
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dowling, C. A. (2013). Analysis of global debris-flow fatalities and related socioeconomic factors from 1950 to 2011, An. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/78297
Chicago Manual of Style (16th Edition):
Dowling, Casey Alexander. “Analysis of global debris-flow fatalities and related socioeconomic factors from 1950 to 2011, An.” 2013. Masters Thesis, Colorado School of Mines. Accessed March 05, 2021.
http://hdl.handle.net/11124/78297.
MLA Handbook (7th Edition):
Dowling, Casey Alexander. “Analysis of global debris-flow fatalities and related socioeconomic factors from 1950 to 2011, An.” 2013. Web. 05 Mar 2021.
Vancouver:
Dowling CA. Analysis of global debris-flow fatalities and related socioeconomic factors from 1950 to 2011, An. [Internet] [Masters thesis]. Colorado School of Mines; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11124/78297.
Council of Science Editors:
Dowling CA. Analysis of global debris-flow fatalities and related socioeconomic factors from 1950 to 2011, An. [Masters Thesis]. Colorado School of Mines; 2013. Available from: http://hdl.handle.net/11124/78297
San Jose State University
23.
Enriquez, Evan Scott.
Debris Flow Fans in Yosemite Valley National Park, California.
Degree: MS, Geology, 2016, San Jose State University
URL: https://doi.org/10.31979/etd.ky8v-7pm5
;
https://scholarworks.sjsu.edu/etd_theses/4721
► Formation of debris flow fans poses a potential hazard to the infrastructure and inhabitants of Yosemite Valley. Research was conducted on debris flow fans…
(more)
▼ Formation of debris flow fans poses a potential hazard to the infrastructure and inhabitants of Yosemite Valley. Research was conducted on debris flow fans at three field sites in Yosemite Valley: Indian Creek, Eagle Creek, and Sentinel Creek. The study utilized a Trimble Pro XR Differential Global Positioning System (DGPS), Cosmogenic Berellium-10 (10Be) dating, and debris flow volume measurements to better understand the spatial distribution, age, and magnitude of prehistoric debris flow deposits at each field site. It is hypothesized that all three fans were constructed quickly after the last glacial maximum (LGM), which is dated at 19.8 ka. It is also proposed that increased rainfall and sediment production during the LGM provided the necessary conditions for debris flow initiation in each catchment. Future debris flow initiation is contingent on channels being pre-loaded with sediment and above average rainfall. At the present time, the channels are loaded with debris, but future debris flow initiation seems unlikely to occur because the fans have been inactive for thousands of years. Debris flows only pose a significant hazard to Yosemite Valley, if and when, the optimum conditions are met.
Subjects/Keywords: Debris Flow Fans; Debris Flows; Yosemite Valley National Park
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APA (6th Edition):
Enriquez, E. S. (2016). Debris Flow Fans in Yosemite Valley National Park, California. (Masters Thesis). San Jose State University. Retrieved from https://doi.org/10.31979/etd.ky8v-7pm5 ; https://scholarworks.sjsu.edu/etd_theses/4721
Chicago Manual of Style (16th Edition):
Enriquez, Evan Scott. “Debris Flow Fans in Yosemite Valley National Park, California.” 2016. Masters Thesis, San Jose State University. Accessed March 05, 2021.
https://doi.org/10.31979/etd.ky8v-7pm5 ; https://scholarworks.sjsu.edu/etd_theses/4721.
MLA Handbook (7th Edition):
Enriquez, Evan Scott. “Debris Flow Fans in Yosemite Valley National Park, California.” 2016. Web. 05 Mar 2021.
Vancouver:
Enriquez ES. Debris Flow Fans in Yosemite Valley National Park, California. [Internet] [Masters thesis]. San Jose State University; 2016. [cited 2021 Mar 05].
Available from: https://doi.org/10.31979/etd.ky8v-7pm5 ; https://scholarworks.sjsu.edu/etd_theses/4721.
Council of Science Editors:
Enriquez ES. Debris Flow Fans in Yosemite Valley National Park, California. [Masters Thesis]. San Jose State University; 2016. Available from: https://doi.org/10.31979/etd.ky8v-7pm5 ; https://scholarworks.sjsu.edu/etd_theses/4721
University of Tasmania
24.
Parajuli, A.
Marine debris in the Derwent Estuary : behaviour and perception of beach users.
Degree: 2014, University of Tasmania
URL: https://eprints.utas.edu.au/22598/1/Parajuli%20whole%20thesis.pdf
► Marine debris is a recognised form of marine pollution. Its impacts on marine biota (marine mammals, sea birds, coral reefs, plants, fishes) have been widely…
(more)
▼ Marine debris is a recognised form of marine pollution. Its impacts on marine biota (marine mammals, sea birds, coral reefs, plants, fishes) have been widely documented. Apart from this, its impacts on human health have in addition drawn the attention of global community. It has impacted tourism due to the reducing aesthetic values of marine environment. A high economic cost is associated with clean ups in order to minimize these impacts associated to marine debris. Researchers have shown that marine debris has led to environmental degradation on the beaches around the world. Though legislative instruments exist to mitigate the problem and international, national and state legislation have been adopted worldwide, they are yet to be strongly implemented. The aim of the research project was to determine behaviour and perceptions of Derwent Estuary beach users about marine debris.
A total of ten beaches around Hobart were surveyed from August to September 2014. Social perception surveys on littering was performed through structured questionnaires which also included participants activities at the beaches of whether or not their activities contribute to the issue and their suggestions to improve beach condition was noted. Participants over the age of 18 were only included during surveys. Chi-square analysis was used for assessing people's perceptions activities beaches and recommendations to combat the issue. The results from the beach surveys show that 32% of people answered that they have littered in the past which is consistent with the similar studies conducted elsewhere.
Subjects/Keywords: Marine debris; beach; Derwent Estuary; beach behaviour; plastic debris; marine
ecosystem
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APA (6th Edition):
Parajuli, A. (2014). Marine debris in the Derwent Estuary : behaviour and perception of beach users. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/22598/1/Parajuli%20whole%20thesis.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Parajuli, A. “Marine debris in the Derwent Estuary : behaviour and perception of beach users.” 2014. Thesis, University of Tasmania. Accessed March 05, 2021.
https://eprints.utas.edu.au/22598/1/Parajuli%20whole%20thesis.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Parajuli, A. “Marine debris in the Derwent Estuary : behaviour and perception of beach users.” 2014. Web. 05 Mar 2021.
Vancouver:
Parajuli A. Marine debris in the Derwent Estuary : behaviour and perception of beach users. [Internet] [Thesis]. University of Tasmania; 2014. [cited 2021 Mar 05].
Available from: https://eprints.utas.edu.au/22598/1/Parajuli%20whole%20thesis.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Parajuli A. Marine debris in the Derwent Estuary : behaviour and perception of beach users. [Thesis]. University of Tasmania; 2014. Available from: https://eprints.utas.edu.au/22598/1/Parajuli%20whole%20thesis.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
25.
Anderson, Paul V.
Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.
Degree: PhD, Aerospace Engineering Sciences, 2010, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/14
► The geosynchronous orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital debris, but is heavily populated…
(more)
▼ The geosynchronous orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital
debris, but is heavily populated with high-value assets from the civil, commercial, and defense sectors. The GEO arena is home to hundreds of communications, data transmission, and intelligence satellites collectively insured for an estimated 18.3 billion USD. As the lack of natural cleansing mechanisms at the GEO altitude renders the lifetimes of GEO
debris essentially infinite, conjunction and risk assessment must be performed to safeguard operational assets from
debris collisions.
In this thesis, longitude-dependent
debris congestion is characterized by predicting the number of near-miss events per day for every longitude slot at GEO, using custom
debris propagation tools and a torus intersection metric. Near-miss events with the presentday
debris population are assigned risk levels based on GEO-relative position and speed, and this risk information is used to prioritize the population for
debris removal target selection. Long-term projections of
debris growth under nominal launch traffic, mitigation practices, and fragmentation events are also discussed, and latitudinal synchronization of theGEOdebris population is explained via node variations arising from luni-solar gravity.
In addition to characterizing localized
debris congestion in the GEO ring, this thesis further investigates the conjunction risk to operational satellites or
debris removal systems applying low-thrust propulsion to raise orbit altitude at end-of-life to a super-synchronous disposal orbit. Conjunction risks as a function of thrust level, miss distance, longitude, and semi-major axis are evaluated, and a guidance method for evading conjuncting
debris with continuous thrust by means of a thrust heading change via single-shooting is developed.
Advisors/Committee Members: Hanspeter Schaub, Brandon Jones, Jeffrey Parker.
Subjects/Keywords: active debris removal; geostationary orbit; geosynchronous orbit; orbital debris; Aerospace Engineering
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APA (6th Edition):
Anderson, P. V. (2010). Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/14
Chicago Manual of Style (16th Edition):
Anderson, Paul V. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2010. Doctoral Dissertation, University of Colorado. Accessed March 05, 2021.
https://scholar.colorado.edu/asen_gradetds/14.
MLA Handbook (7th Edition):
Anderson, Paul V. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2010. Web. 05 Mar 2021.
Vancouver:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Internet] [Doctoral dissertation]. University of Colorado; 2010. [cited 2021 Mar 05].
Available from: https://scholar.colorado.edu/asen_gradetds/14.
Council of Science Editors:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Doctoral Dissertation]. University of Colorado; 2010. Available from: https://scholar.colorado.edu/asen_gradetds/14
University of Colorado
26.
Anderson, Paul Vincent.
Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.
Degree: PhD, Aerospace Engineering Sciences, 2015, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/91
► The geosynchronous orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital debris, but is heavily populated…
(more)
▼ The geosynchronous orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital
debris, but is heavily populated with high-value assets from the civil, commercial, and defense sectors. The GEO arena is home to hundreds of communications, data transmission, and intelligence satellites collectively insured for an estimated 18.3 billion USD. As the lack of natural cleansing mechanisms at the GEO altitude renders the lifetimes of GEO
debris essentially infinite, conjunction and risk assessment must be performed to safeguard operational assets from
debris collisions. In this thesis, longitude-dependent
debris congestion is characterized by predicting the number of near-miss events per day for every longitude slot at GEO, using custom
debris propagation tools and a torus intersection metric. Near-miss events with the present-day
debris population are assigned risk levels based on GEO-relative position and speed, and this risk information is used to prioritize the population for
debris removal target selection. Long-term projections of
debris growth under nominal launch traffic, mitigation practices, and fragmentation events are also discussed, and latitudinal synchronization of the GEO
debris population is explained via node variations arising from luni-solar gravity. In addition to characterizing localized
debris congestion in the GEO ring, this thesis further investigates the conjunction risk to operational satellites or
debris removal systems applying low-thrust propulsion to raise orbit altitude at end-of-life to a super-synchronous disposal orbit. Conjunction risks as a function of thrust level, miss distance, longitude, and semi-major axis are evaluated, and a guidance method for evading conjuncting
debris with continuous thrust by means of a thrust heading change via single-shooting is developed.
Advisors/Committee Members: Hanspeter Schaub, Brandon Jones, Jeffrey Parker, Juan Restrepo, Darren McKnight.
Subjects/Keywords: active debris removal; geostationary orbit; geosynchronous orbit; orbital debris; Aerospace Engineering
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Anderson, P. V. (2015). Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/91
Chicago Manual of Style (16th Edition):
Anderson, Paul Vincent. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2015. Doctoral Dissertation, University of Colorado. Accessed March 05, 2021.
https://scholar.colorado.edu/asen_gradetds/91.
MLA Handbook (7th Edition):
Anderson, Paul Vincent. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2015. Web. 05 Mar 2021.
Vancouver:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Mar 05].
Available from: https://scholar.colorado.edu/asen_gradetds/91.
Council of Science Editors:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/asen_gradetds/91
University of Hong Kong
27.
Chiu, Yu-ho.
Design of barriers against
recurrent debris flows.
Degree: 2003, University of Hong Kong
URL: http://hdl.handle.net/10722/31620
Subjects/Keywords: Debris
avalanches - Control.; Debris
avalanches.
Record Details
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Manager
APA (6th Edition):
Chiu, Y. (2003). Design of barriers against
recurrent debris flows. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/31620
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chiu, Yu-ho. “Design of barriers against
recurrent debris flows.” 2003. Thesis, University of Hong Kong. Accessed March 05, 2021.
http://hdl.handle.net/10722/31620.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chiu, Yu-ho. “Design of barriers against
recurrent debris flows.” 2003. Web. 05 Mar 2021.
Vancouver:
Chiu Y. Design of barriers against
recurrent debris flows. [Internet] [Thesis]. University of Hong Kong; 2003. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10722/31620.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chiu Y. Design of barriers against
recurrent debris flows. [Thesis]. University of Hong Kong; 2003. Available from: http://hdl.handle.net/10722/31620
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Clemson University
28.
Grayson, James.
DEVELOPMENT AND APPLICATION OF A THREE-DIMENSIONAL PROBABILISTIC WIND-BORNE DEBRIS TRAJECTORY MODEL.
Degree: MS, Civil Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1266
► This research presents a probabilistic debris trajectory model adapted from current 6-degree-of-freedom (6-DoF) deterministic models, in which the aleatoric (inherent) uncertainty is explicitly considered in…
(more)
▼ This research presents a probabilistic
debris trajectory model adapted from current 6-degree-of-freedom (6-DoF) deterministic models, in which the aleatoric (inherent) uncertainty is explicitly considered in the proposed probabilistic model. While the inherent randomness in the
debris flight trajectory is irreducible due to the wind turbulence, variation in wind direction, gustiness of the wind event and so forth, the proposed probabilistic model seeks to address these uncertainties through Monte Carlo simulations with the appropriate statistical distributions applied to the governing equations of motion of the
debris. Verification of the probabilistic
debris trajectory model is performed through an analytical and visual comparison of the simulated data to wind tunnel test data. Good agreement is observed between the simulated and the wind tunnel test
debris landing locations, thus confirming the applicability of the probabilistic wind-borne
debris model. A preliminary study regarding the current wind-borne
debris impact methodology has illustrated that there is a significant increase in the total kinetic energy of
debris impact when the dynamic parameters of the
debris trajectory, translational and rotational, are considered; therefore, the proposed probabilistic model not only provides an effective method for predicting the variation of
debris trajectories in a three-dimensional (3D) space, which is imperative when performing regional building envelope impact risk , but it is also capable of providing guidance on
debris impact protection.
Advisors/Committee Members: Pang, WeiChiang, Schiff , Scott, Kaye , Nigel.
Subjects/Keywords: Building Envelope; Debris Impact; Debris Trajectory; Hurricane; Risk Assessment; Civil Engineering
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MLA ·
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Manager
APA (6th Edition):
Grayson, J. (2011). DEVELOPMENT AND APPLICATION OF A THREE-DIMENSIONAL PROBABILISTIC WIND-BORNE DEBRIS TRAJECTORY MODEL. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1266
Chicago Manual of Style (16th Edition):
Grayson, James. “DEVELOPMENT AND APPLICATION OF A THREE-DIMENSIONAL PROBABILISTIC WIND-BORNE DEBRIS TRAJECTORY MODEL.” 2011. Masters Thesis, Clemson University. Accessed March 05, 2021.
https://tigerprints.clemson.edu/all_theses/1266.
MLA Handbook (7th Edition):
Grayson, James. “DEVELOPMENT AND APPLICATION OF A THREE-DIMENSIONAL PROBABILISTIC WIND-BORNE DEBRIS TRAJECTORY MODEL.” 2011. Web. 05 Mar 2021.
Vancouver:
Grayson J. DEVELOPMENT AND APPLICATION OF A THREE-DIMENSIONAL PROBABILISTIC WIND-BORNE DEBRIS TRAJECTORY MODEL. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Mar 05].
Available from: https://tigerprints.clemson.edu/all_theses/1266.
Council of Science Editors:
Grayson J. DEVELOPMENT AND APPLICATION OF A THREE-DIMENSIONAL PROBABILISTIC WIND-BORNE DEBRIS TRAJECTORY MODEL. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1266
Virginia Tech
29.
Ohriner, Ethan Benjamin Lewis.
Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation.
Degree: MS, Aerospace Engineering, 2021, Virginia Tech
URL: http://hdl.handle.net/10919/102096
► Orbital debris is defined as all non-operational, man-made objects currently in space. US national space regulations require every new satellite to have a de-orbit plan…
(more)
▼ Orbital
debris is defined as all non-operational, man-made objects currently in space. US national space regulations require every new satellite to have a de-orbit plan to prevent the creation of new
debris, but fails to address the thousands of derelict objects currently hindering space operations. As space traffic increases, so does the economic impact of orbital
debris on the sustainability of systems that increasingly support national security and commercial growth. While orbital
debris is usually assessed by looking at the full volume of space, most massive
debris objects are concentrated in high-density clusters with a higher than normal probability for collision. A potential solution to the growing orbital
debris problem is to place a group of observation satellites within these
debris clusters to both improve monitoring capabilities and provide a means for preventing potential collisions by engaging with
debris via Laser
Debris Removal (LDR). This research presents a methodology for comparing and contrasting different observer satellite constellation designs. Our results show that increasingly complex orbit designs improve various performance criteria, but ultimately orbits that more closely match those of the
debris objects provide the best coverage. The proposed method of observation and engagement could significantly reduce the threat orbital
debris poses to space operations and economic growth.
Advisors/Committee Members: Black, Jonathan T. (committeechair), Shinpaugh, Kevin A. (committee member), VanDyke, Matthew Clark (committee member).
Subjects/Keywords: orbital debris; laser debris removal; constellation design; space situational awareness
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APA ·
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APA (6th Edition):
Ohriner, E. B. L. (2021). Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/102096
Chicago Manual of Style (16th Edition):
Ohriner, Ethan Benjamin Lewis. “Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation.” 2021. Masters Thesis, Virginia Tech. Accessed March 05, 2021.
http://hdl.handle.net/10919/102096.
MLA Handbook (7th Edition):
Ohriner, Ethan Benjamin Lewis. “Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation.” 2021. Web. 05 Mar 2021.
Vancouver:
Ohriner EBL. Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation. [Internet] [Masters thesis]. Virginia Tech; 2021. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10919/102096.
Council of Science Editors:
Ohriner EBL. Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation. [Masters Thesis]. Virginia Tech; 2021. Available from: http://hdl.handle.net/10919/102096
University of Cambridge
30.
McCarthy, Michael James.
Quantifying supraglacial debris thickness at local to regional scales.
Degree: PhD, 2019, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/294073
► Supraglacial debris thickness is a key control on the surface energy balance of debris-covered glaciers, which are common in temperate mountain ranges around the world.…
(more)
▼ Supraglacial debris thickness is a key control on the surface energy balance of debris-covered glaciers, which are common in temperate mountain ranges around the world. As such, it is an important input variable to the sorts of models that are used to understand and predict glacier change, which are essential for determining future water supply in glacierised regions and glacier contributions to sea-level rise. However, to quantify supraglacial debris thickness is difficult: making direct measurements is laborious and existing remote sensing approaches have not been thoroughly validated, so there is a general paucity of supraglacial debris thickness data. This thesis investigates methods of quantifying supraglacial debris thickness at local to regional scales. First, it makes in-situ field measurements of debris thickness at the local scale on glaciers in the Himalaya and the European Alps by manual excavation and by ground-penetrating radar (GPR). Second, it uses some of these field measurements to test and develop thermal remote sensing approaches to quantifying supraglacial debris thickness at the glacier scale. Third, it uses a dynamic energy-balance model in an inverse approach to quantify debris thickness on the glaciers of three watersheds in High Mountain Asia from thermal satellite imagery and high-resolution meteorological reanalysis data.
At the local scale, GPR is found to be useful for measuring supraglacial debris thickness accurately and precisely, at least in the range 0.16-4.9 m. Debris thickness is highly variable over horizontal distances of < 10 m on individual glaciers due to gravitational reworking, which necessarily implies higher sub-debris ice melt rates than if debris thickness was spatially invariable. At the glacier scale, thermal remote sensing approaches can reproduce field measurements, and remote sensing estimates of supraglacial debris thickness can be used successfully to model sub-debris melting. If well-distributed field measurements are available, supraglacial debris thickness should be extrapolated using remote sensing-derived pseudo daily mean surface temperatures. Otherwise, it should be determined iteratively by minimising the mismatch between remotely sensed surface temperatures, preferably from night-time thermal images, and surface temperatures determined using a dynamic energy-balance model. At the regional scale, thermal satellite imagery and high-resolution meteorological reanalysis data can be used to provide reasonable estimates of supraglacial debris thickness. However, modelled uncertainties are not always able to explain ground-truth measurements, and there is a tendency towards underestimation due to problems associated with supraglacial ponds and ice cliffs and the spatial resolution of input data.
The findings of this thesis will lead to improvements in the quantification of supraglacial debris
thickness at a range of scales and, therefore, in the understanding and prediction of glacier change in temperate mountain ranges.
Subjects/Keywords: glaciology; debris-covered glaciers; remote sensing; energy-balance modelling; ground-penetrating radar; supraglacial debris; supraglacial debris thickness
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APA ·
Chicago ·
MLA ·
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Export
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Manager
APA (6th Edition):
McCarthy, M. J. (2019). Quantifying supraglacial debris thickness at local to regional scales. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/294073
Chicago Manual of Style (16th Edition):
McCarthy, Michael James. “Quantifying supraglacial debris thickness at local to regional scales.” 2019. Doctoral Dissertation, University of Cambridge. Accessed March 05, 2021.
https://www.repository.cam.ac.uk/handle/1810/294073.
MLA Handbook (7th Edition):
McCarthy, Michael James. “Quantifying supraglacial debris thickness at local to regional scales.” 2019. Web. 05 Mar 2021.
Vancouver:
McCarthy MJ. Quantifying supraglacial debris thickness at local to regional scales. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Mar 05].
Available from: https://www.repository.cam.ac.uk/handle/1810/294073.
Council of Science Editors:
McCarthy MJ. Quantifying supraglacial debris thickness at local to regional scales. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://www.repository.cam.ac.uk/handle/1810/294073
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Open Access Theses and Dissertations