Rozprawy doktorskie na temat „Slopes”
Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Slopes.
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 50 najlepszych rozpraw doktorskich naukowych na temat „Slopes”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj rozprawy doktorskie z różnych dziedzin i twórz odpowiednie bibliografie.
1
Presbitero, Alan Ludovice, i n/a. "Soil Erosion Studies on Steep Slopes of Humid-Tropic Philippines". Griffith University. Australian School of Environmental Studies, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040906.151808.
Pełny tekst źródłaStreszczenie:
An in-situ water-induced soil erosion study of two years duration was conducted at a low slope of about 10%, and also on steep slopes of about 50%, 60% and 70% at the experimental site located at a soil and water research area contiguous to the Department of Agricultural Engineering and Applied Mathematics of the Visayas State College of Agriculture (ViSCA). ViSCA is located in the town of Baybay at the island of Leyte in humid tropical Philippines (latitude of 10 degrees 44' north and longitude of 124 degrees 48' east). The study has the following aims, namely: 1) to investigate the effect of local farming practices on soil erosion, particularly at steep slopes; 2) to study the hydrology and soil erosion processes in steep slope conditions in humid tropical climate; and 3) to apply and determine the limitations of a physical process-oriented sediment transport model for water-induced soil erosion model (Griffith University Erosion System Template, GUEST) to a very permeable soil under very high rainfall conditions. In the context of the steep slope experiments at ViSCA: a) across the slope planting of corn is equally effective in controlling soil loss as hedged farming alone or in combination with peanut intercrop; b) across the slope planting of corn in hedged runoff plots is as effective in controlling soil loss as when combined with peanut intercrop; c) farmers practice of planting a rowcrop like corn along the slope (providing ready-made downslope pathways for runoff water thus, encouraging flow-driven soil erosion) produces significant soil loss, often larger than from a bare runoff plot; d) hedgerows significantly reduced sediment concentration provided they remain intact; e) "failure" in hedgerows, often results in massive soil loss, being even greater than that in a comparable bare runoff plot. (Failure is manifested by runoff breaching the litter barrier at the base of the hedgerow in a localized position, leading to concentrated flow and extension of rills upslope from base of hedgerow) of hedged runoff plot (even though contour planted) and f) application of stubble in combination with across slope planting in hedged runoff plots (with or without a closely growing intercrop) provided both maximum surface cover (aerial and contact) and protection against soil loss in steep slopes. These conclusions are likely to apply to crops similar to corn, with an intercrop similar to peanut in morphology and root system. These conclusions might also be expected to apply to low slopes, though the effect of such protection might not be as pronounced as in steep slope runoff plots. Soil erosion mechanisms in steep slopes are dominated mainly by the runoff-driven processes of entrainment and re-entrainment. Average sediment concentration c and total soil loss M are shown to be functions of positive coefficient runoff related regressors and a parameter that measures rills formed and permanently imprinted on soil surface, and of negative coefficient regressors related to surface contact cover, at least for the steep slopes considered in this study. The relatively high streampower associated with overland flow on steep slopes suggests that overland flow dominates over rainfall impact as a source of soil sediment concentration. This was confirmed by the low value of the measured ratio of soil sediment concentration shed by net-rainfall detachment trays to that lost from the bare runoff plots. On the effect of surface contact cover on average sediment concentration c, the following findings were made, namely: a) surface contact cover of only about 20% to 30% is sufficient to reduce c to low levels, assuming the cover is well distributed; b) an "exponential-decay" form of relationship existed between surface contact cover and the average sediment concentration from the non-bare soil without normalizing with respect to sediment concentration from a reference bare soil runoff plot; and c) such nonlinear relationship is indicative of the dominating runoff processes of entrainment and re-entrainment compared to the linear form of relationships if rainfall driven processes of detachment and re-detachment dominate. In runoff dominated soil erosion processes, surface contact cover (including both living and dead vegetative cover close enough to the soil surface to impede overland flow) is more significant in curtailing soil erosion than aerial surface cover. ...continued.
2
Presbitero, Alan Ludovice. "Soil Erosion Studies on Steep Slopes of Humid-Tropic Philippines". Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366622.
Pełny tekst źródłaStreszczenie:
An in-situ water-induced soil erosion study of two years duration was conducted at a low slope of about 10%, and also on steep slopes of about 50%, 60% and 70% at the experimental site located at a soil and water research area contiguous to the Department of Agricultural Engineering and Applied Mathematics of the Visayas State College of Agriculture (ViSCA). ViSCA is located in the town of Baybay at the island of Leyte in humid tropical Philippines (latitude of 10 degrees 44' north and longitude of 124 degrees 48' east). The study has the following aims, namely: 1) to investigate the effect of local farming practices on soil erosion, particularly at steep slopes; 2) to study the hydrology and soil erosion processes in steep slope conditions in humid tropical climate; and 3) to apply and determine the limitations of a physical process-oriented sediment transport model for water-induced soil erosion model (Griffith University Erosion System Template, GUEST) to a very permeable soil under very high rainfall conditions. In the context of the steep slope experiments at ViSCA: a) across the slope planting of corn is equally effective in controlling soil loss as hedged farming alone or in combination with peanut intercrop; b) across the slope planting of corn in hedged runoff plots is as effective in controlling soil loss as when combined with peanut intercrop; c) farmer’s practice of planting a rowcrop like corn along the slope (providing ready-made downslope pathways for runoff water thus, encouraging flow-driven soil erosion) produces significant soil loss, often larger than from a bare runoff plot; d) hedgerows significantly reduced sediment concentration provided they remain intact; e) "failure" in hedgerows, often results in massive soil loss, being even greater than that in a comparable bare runoff plot. (Failure is manifested by runoff breaching the litter barrier at the base of the hedgerow in a localized position, leading to concentrated flow and extension of rills upslope from base of hedgerow) of hedged runoff plot (even though contour planted) and f) application of stubble in combination with across slope planting in hedged runoff plots (with or without a closely growing intercrop) provided both maximum surface cover (aerial and contact) and protection against soil loss in steep slopes. These conclusions are likely to apply to crops similar to corn, with an intercrop similar to peanut in morphology and root system. These conclusions might also be expected to apply to low slopes, though the effect of such protection might not be as pronounced as in steep slope runoff plots. Soil erosion mechanisms in steep slopes are dominated mainly by the runoff-driven processes of entrainment and re-entrainment. Average sediment concentration c and total soil loss M are shown to be functions of positive coefficient runoff related regressors and a parameter that measures rills formed and permanently imprinted on soil surface, and of negative coefficient regressors related to surface contact cover, at least for the steep slopes considered in this study. The relatively high streampower associated with overland flow on steep slopes suggests that overland flow dominates over rainfall impact as a source of soil sediment concentration. This was confirmed by the low value of the measured ratio of soil sediment concentration shed by net-rainfall detachment trays to that lost from the bare runoff plots. On the effect of surface contact cover on average sediment concentration c, the following findings were made, namely: a) surface contact cover of only about 20% to 30% is sufficient to reduce c to low levels, assuming the cover is well distributed; b) an "exponential-decay" form of relationship existed between surface contact cover and the average sediment concentration from the non-bare soil without normalizing with respect to sediment concentration from a reference bare soil runoff plot; and c) such nonlinear relationship is indicative of the dominating runoff processes of entrainment and re-entrainment compared to the linear form of relationships if rainfall –driven processes of detachment and re-detachment dominate. In runoff dominated soil erosion processes, surface contact cover (including both living and dead vegetative cover close enough to the soil surface to impede overland flow) is more significant in curtailing soil erosion than aerial surface cover. ... [continued].Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Australian School of Environmental Studies
Faculty of Environmental Sciences
Full Text
3
Tsaparas, Ilias. "Field measurement and numerical modelling of infiltration and matric suctions within slopes". Thesis, Durham University, 2002. http://etheses.dur.ac.uk/1715/.
Pełny tekst źródła
4
Ross, Andrew Neil. "Gravity currents on slopes". Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621127.
Pełny tekst źródła
5
Stevens, W. Richard(William Richard). "Pore water pressure in rock slopes and rockfill slopes subject to dynamic loading". Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/191872.
Pełny tekst źródłaStreszczenie:
A simplified method for simulating the response of rockfill and rock slopes subject to a dynamic load is presented. A pore pressure analysis is incorporated into a dynamic slope stability computer program, the Linear Acceleration Dynamic Response of Slopes -- Multiple Degrees of Freedom (LADRS-MDF), developed by Dr. C.E. Glass of the University of Arizona. LADRS-MDF is based on Barton's empirical shear strength criteria and uses the entire acceleration time history. The dynamic water pressure analysis depends on the slope conditions. Only the transient water pressure is present in material where the excess pore pressure dissipation exceeds the excess pore pressure generation. When excess pore pressure generation is greater than the dissipation, a water pressure buildup is present along with the transient pore water pressure.
6
Bernardi, Lorenzo. "Centrifuge Modeling of Sandy Slopes". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amslaurea.unibo.it/125/.
Pełny tekst źródłaStreszczenie:
Slope failure occurs in many areas throughout the world and it becomes an important problem when it interferes with human activity, in which disasters provoke loss of life and property damage.
In this research we investigate the slope failure through the centrifuge modeling, where a reduced-scale model, N times smaller than the full-scale (prototype), is used whereas the acceleration is increased by N times (compared with the gravity acceleration) to preserve the stress and the strain behavior.
The aims of this research “Centrifuge modeling of sandy slopes” are in extreme synthesis:
1) test the reliability of the centrifuge modeling as a tool to investigate the behavior of a sandy slope failure;
2) understand how the failure mechanism is affected by changing the slope angle and obtain useful information for the design.
In order to achieve this scope we arranged the work as follows:
Chapter one: centrifuge modeling of slope failure. In this chapter we provide a general view about the context in which we are working on. Basically we explain what is a slope failure, how it happens and which are the tools available to investigate this phenomenon. Afterwards we introduce the technology used to study this topic, that is the geotechnical centrifuge.
Chapter two: testing apparatus. In the first section of this chapter we describe all the procedures and facilities used to perform a test in the centrifuge. Then we explain the characteristics of the soil (Nevada sand), like the dry unit weight, water content, relative density, and its strength parameters (c,φ), which have been calculated in laboratory through the triaxial test.
Chapter three: centrifuge tests. In this part of the document are presented all the results from the tests done in centrifuge. When we talk about results we refer to the acceleration at failure for each model tested and its failure surface. In our case study we tested models with the same soil and geometric characteristics but different angles. The angles tested in this research were: 60°, 75° and 90°.
Chapter four: slope stability analysis. We introduce the features and the concept of the software: ReSSA (2.0). This software allows us to calculate the theoretical failure surfaces of the prototypes. Then we show in this section the comparisons between the experimental failure surfaces of the prototype, traced in the laboratory, and the one calculated by the software.
Chapter five: conclusion. The conclusion of the research presents the results obtained in relation to the two main aims, mentioned above.
7
Chan, Peter D. S. "Soil-pipeline interaction in slopes". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0019/MQ49672.pdf.
Pełny tekst źródła
8
Nicolaou, Maria. "Gait adaptations to transverse slopes". Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32931.
Pełny tekst źródłaStreszczenie:
The purpose of the study was to identify the lower limb kinematic adaptations made in normal gait to accommodate to static transverse slopes. Five male subjects were asked to walk along a platform at 0%, 5% and 10% slope. Kinematic data for the ankle, knee and hip were collected at 60Hz using the Ultratrak RTM (Polhemus Inc., Burlington, VT, USA) electromagnetic tracking system. Results indicated that significant (p < 0.05) joint angle changes occurred in both the uphill (UH) and downhill (DH) lower limbs. The adaptations served as compensatory changes to functionally shorten the UH limb and lengthen the DH limb.
9
Kilford, Lloyd James Peter. "Slopes of overconvergent modular forms". Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397650.
Pełny tekst źródła
10
Jacobs, Daniel. "Slopes of compact Hecke operators". Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397675.
Pełny tekst źródła
11
Kemp, M. J. "Stability processes in tropical slopes". Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372032.
Pełny tekst źródła
12
Liang, Teng. "Seismic performance of vegetated slopes". Thesis, University of Dundee, 2015. https://discovery.dundee.ac.uk/en/studentTheses/04c95230-9768-4c0a-8b8a-b32081d039a9.
Pełny tekst źródła
13
Dwyer, Todd Douglas. "Development of a physical slope failure model /". free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1421132.
Pełny tekst źródła
14
吳國樑 i Kwok-leung Axel Ng. "Elasto-plasticity of slopes and embankments". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31209373.
Pełny tekst źródła
15
Wint, Joanne. "Geotechnical site investigation of vegetated slopes". Thesis, Nottingham Trent University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429261.
Pełny tekst źródła
16
CUENTAS, RICARDO ENRIQUE SILVA. "DYNAMIC STABILITY ANALYSIS OF EARTH SLOPES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4658@1.
Pełny tekst źródłaStreszczenie:
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOREsta dissertação apresenta uma comparação dos métodos utilizados para análise da estabilidade dinâmica de taludes de solo através de métodos pseudoestáticos (equilíbrio limite) e dinâmicos (método dos elementos finitos). Com ambos os métodos foram estudadas as características de estabilidade de 47 perfis de taludes da Costa Verde, faixa litorânea na cidade de Lima, Peru, abrigando importante rodovia ladeada por 8,25 km de taludes íngremes e de grande altura. Nesta região a ocorrência de sismos é freqüente, devido ao fenômeno da subducção da placa de Nazca sob a placa Continental Sul-Americana. O sismo de projeto foi estabelecido em relação a estudos regionais de risco sísmico e o acelerograma utilizado corresponde ao registrado no terremoto de Lima de 03 de outubro de 1974, normalizado para uma aceleração máxima de projeto de 0,33g. Os resultado obtidos pelos métodos pseudo-estáticos e pelo método dos elementos finitos apresentam diferenças em alguns dos perfis analisados, provavelmente porque os métodos pseudo-estáticos geralmente consideram as forças de inércia constantes na fatia e sem mudança de sentido durante o período da excitação sísmica.
This thesis presents a comparison between the methods generally used for dynamic stability analysis of earth slopes, based either on a pseudo-static approach (limit equilibrium method) or on a dynamic approach (finite element method). Forty-seven profiles from the Costa Verde slopes located in Lima, Peru, were analyzed with both classes of methods. In this region seismic activity is quite common, caused by subduction of the Nazca plate into the South American Plate. The design seism was established from regional studies of seismic risks and the accelerogram used in this research corresponds to the seismic records from a major earthquake that hit Lima on October 3rd, 1974, herein normalized with respect to the maximum design acceleration of 0,33g. The results obtained with pseudo-static and the finite element methods presented differences in some specific soil profiles, probably because the pseudostatic methods admit that the inertial forces are constants through a soil slice and there are no changes in direction of the dynamic forces during the period of seismic excitation.
17
Mohd, Taib Aizat Bin. "Numerical modelling of unsaturated tropical slopes". Thesis, University of Newcastle upon Tyne, 2018. http://hdl.handle.net/10443/4153.
Pełny tekst źródłaStreszczenie:
Adapting to climate change is one of the greatest challenges facing engineers. Many studies have been conducted since the 1900s directed at predicting extreme weather events. Changes in global weather patterns, such as temperature and rainfall distributions, can have major economic and societal impacts. One example, addressed in this thesis, is the stability of natural slopes. In Southeast Asia, landslides are common due to the effect of abundant rainfall during the wet monsoon. The local climate in the region is characterised by annual wet and dry seasons, in which the cycle forms an unsaturated zone at the surface of the slopes. However, as a result of climate change, prolonged drying and heavy rainfall are observed that may exacerbate slope failure particularly in unsaturated soils. The prediction and mitigation of slope failures are consequently major challenges due to the complexity of the unsaturated behaviour of tropical soils subjected to irregular weather changes. This thesis develops a methodology to model unsaturated slope behaviour taking into account the effects of climate change. The approach includes groundwater flow, soil deformation and stability analyses using a finite element method and climate change predictions to incorporate future weather scenarios. The method was established by validating the groundwater flow analysis by involving a case study in Zaoyang, China. Subsequently, a more complex case study of a tropical unsaturated slope in Bukit Timah, Singapore was also considered to calibrate the soil-water characteristic curves (SWCC), a major controlling factor in unsaturated soils mechanics. The coupled flow-deformation analysis was undertaken on the validated case studies to predict soil displacement. In addition, a parametric study was conducted to critically analyse the effects of void ratio, saturated permeability, hysteretic SWCC, soil elasticity and rainfall intensity regarding slope behaviour. Finally, statistical analysis was performed to predict the impact of climate change on the rainfall distribution in Singapore up to the year 2100 by using the historical data from 1980 to 2010. Frequency analysis was adopted to estimate the rainfall return period. The results of the future extreme rainfall were compared to predictions by the Met Office in Singapore and the United Kingdom. The effects of climate change on slope behaviour was assessed by applying the predicted climate in the slope models. The outcomes reveal that the modelling approach is able to capture groundwater flow, slope deformation and safety factor accurately under extreme weather scenarios.
18
Al-Defae, Asad Hafudh Humaish. "Seismic performance of pile-reinforced slopes". Thesis, University of Dundee, 2013. https://discovery.dundee.ac.uk/en/studentTheses/829dd554-a7e9-4c61-9206-01909793666c.
Pełny tekst źródłaStreszczenie:
Shallow embankment slopes are commonly used to support elements of transport infrastructure in seismic regions. In this thesis, the seismic performance of such slopes in non-liquefiable granular soils has been investigated and an extensive programme of centrifuge testing was conducted to quantify the improvements to seismic slope performance which can be achieved by installing a row of discretely spaced vertical precast concrete piles. This study focussed on permanent movement and dynamic response at different positions within the slope, especially at the crest, which would form key inputs into the aseismic design of supported infrastructure. In contrast to previous studies, the evolution of this behaviour under multiple sequential strong ground motions is studied through dynamic centrifuge modelling, analytical (sliding-block) and numerical (Finite Element) models. This thesis makes three major contributions. Firstly, an improved sliding-block (‘Newmark’) approach is developed for estimating permanent deformations of unreinforced slopes during preliminary design phases, in which the formulation of the yield acceleration is fully strain-dependent, incorporating the effects of both material hardening/softening and geometric hardening (re-grading). This is supported by the development of numerical (Finite Element) models which can additionally predict the settlement profile at the crest of the slope and also the dynamic ground motions at this point, for detailed seismic design were also developed. It is shown that these new models considerably outperform existing state-of-the art models which do not incorporate the geometric changes for the case of an earthquake on a virgin slope. It is further shown that only the improved models can correctly capture the behaviour under further earthquakes (e.g. strong aftershocks) and therefore can be used to determine the whole-life performance of a slope under a suite of representative ground motions that the slope may see during its design life, and allow improved estimates of the seismic performance of slopes beyond their design life. The finite element models can accurately replicate the settlement profile at the crest (important for highway or rail infrastructure) and quantify the dynamic motions which would be input to supported structures, though these were generally over-predicted. Secondly, the principles of physical modelling have been used to produce realistically damageable model piles using a new model reinforced concrete (both a designed section specifically detailed to carry the bending moments induced by the slipping soil mass and a nominally reinforced section with low moment capacity). This was used to investigate how piles can stabilise slopes under earthquake events and how the permanent deformation and the dynamic response of stabilised slope are strongly influenced by the pile spacing (S/B) especially at the minimum pile spacing (i.e. S/B=3.5). This is consistent with previous suggestions made for the optimal S/B ratio for encouraging soil arching between piles at maximum spacing both under monotonic conditions, and for numerical investigations of the seismic problem. These were supported by further centrifuge tests on conventional ‘elastic’ piles which were instrumented to measure seismic soil-pile interaction. The importance of reinforcement detailing was also highlighted, with the nominally reinforced section yielding early in the earthquake; the damaged piles subsequently only offer a small (though measureable) reduction in seismic slope performance compared to the unreinforced case. It was demonstrated that both permanent deformations at the slope crest (e.g. settlement) and dynamic ground motions at the crest can be significantly reduced as pile spacing reduced. Finally, a coupled P-y and elastic continuum approach for modelling soil-pile interaction has been used to develop a Newmark procedure applicable for pile-reinforced slopes. It was observed that the single pile resistance is mobilising at beginning of the earthquake’s time and it is strongly influenced by pile stiffness properties, pile spacing and the depth of the slip surface. It was observed also that the depth of the slip surface and pile spacing (S/B) play an important role in the determination of the permanent deformation of the slope. The results show great agreement to centrifuge test data in term of the permanent deformation (settlement at the crest of the slope) with slight differences between the measured (centrifuge) and calculated (this procedure) maximum bending moments.
19
Gales, Jenny Anne. "The geomorphology of Antarctic submarine slopes". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-geomorphology-of-antarctic-submarine-slopes(d117ad12-927b-44f1-bf67-d195e2fef51b).html.
Pełny tekst źródłaStreszczenie:
The Antarctic continental margin contains a diverse range of continental slope morphologies, including iceberg keel marks, gullies, channels, mass-wasting features (slides, slumps), ridges, furrows, mounds and trough mouth fans. These features vary significantly in morphology, with bedforms varying in size (width, amplitude and length), shelf incision, sinuosity, branching order, spatial density and cross-sectional shape. The processes which form these features and the environmental controls influencing their morphology are not well documented or well constrained. Understanding the processes operating on the Antarctic continental margin is essential for interpreting seafloor erosion patterns, continental margin evolution, slope instability and sediment core records from the continental slope and rise. Through quantitative analysis of multibeam bathymetric data along >2670 km of the outer shelf and upper-slope of high latitude continental margins, five distinct Antarctic gully types are identified. Gully morphology was found to vary with local slope character (slope geometry, gradient), regional factors (location of cross-shelf troughs, trough mouth fans and drainage basin size), sediment yield and ice-sheet history. Most gullies are likely formed by: (1) flows generated as a result of the release of subglacial meltwater from beneath an ice-sheet grounded to the shelf edge during glacial maxima; (2) turbidity currents initiated by intense iceberg scouring; or (3) small-scale mass-wasting. Erosion by cascading dense water overflow does not form the deeply incised and V-shaped gullies that occur over much of the Antarctic continental margin. A comparison of some Arctic and Antarctic gully morphologies shows that the Antarctic gullies have much deeper mean incision depths and greater shelf-incisions, suggesting that they either formed over significantly longer periods, or by a greater release of meltwater in the areas with greater gully incision depths. The first morphological analysis of the southern Weddell Sea outer shelf and upper slope is presented. Two large and relatively recent submarine slides occur on the Crary Fan, the first Quaternary slides to be documented on an Antarctic trough mouth fan. These slides provide evidence for recent large-scale mass-wasting events on the Antarctic continental margin. The interpretation of bedforms on the outer shelf of the southeastern Weddell Sea provide insight into the timing and extent of past ice and points to grounded ice near to the shelf edge during the Late Quaternary.
20
Ng, Kwok-leung Axel. "Elasto-plasticity of slopes and embankments /". [Hong Kong] : University of Hong Kong, 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12718580.
Pełny tekst źródła
21
Ferrari, Gianmarco. "Three-dimensional earthquake response of slopes". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3374/.
Pełny tekst źródła
22
Weih, Robert C. "Evaluating methods for characterizing slope conditions within polygons". Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-06062008-171008/.
Pełny tekst źródła
23
Abd, Akram Hasan. "Geosynthetic-reinforced and unreinforced soil slopes subject to cracks and seismic action : stability assessment and engineered slopes". Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/95496/.
Pełny tekst źródłaStreszczenie:
The main purpose of this thesis is on one hand to enhance the current predictive capabilities of the stability of soil slopes and on the other hand, to improve the design practice to stabilise natural slopes showing signs of distress and make the design of engineered slopes more affordable. To achieve the first objective an analytical method achieved by the upper bound theorem of limit analysis and the pseudo-static approach is derived for the assessment of the stability of slopes manifesting vertical cracks and subject to seismic action. The method is validated by numerical limit analyses and displacement-based finite-element analyses with strength reduction technique. Employing this method slope stability charts to assess the stability factor for fissured slopes subject to both horizontal and vertical accelerations for any combination of c, φ, and slope inclination are produced. To achieve the second objective limit analysis was employed to derive a semi-analytical method to extend the applicability of current method to design the slope reinforcement for frictional backfills to cohesive frictional backfills. Design charts providing the amount of reinforcement needed as a function of cohesion, tensile strength, angle of shearing resistance and slope inclination are obtained. From the results, it emerges that accounting for the presence of cohesion allows significant savings to be made, and that cracks are often significantly detrimental to slope stability so they cannot be overlooked in the design calculations of the reinforcement. Also, a new numerical method to determine multi-linear profiles of optimal shapes for reinforced slopes in frictional backfills is presented. The method is based on the limit analysis upper bound method together with genetic algorithms and provides an optimal profile for a prescribed average slope inclination, backfill strength properties and desired number of layers to be used. Several stability charts illustrating the savings on the required amount of reinforcement are provided for the benefit of designers.
24
Kwok, Sabastein Yih Feng. "Stochastic analysis of coupled surface and subsurface flow model in steep slopes for slope stability analysis /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202003%20KWOK.
Pełny tekst źródłaStreszczenie:
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 201-205). Also available in electronic version. Access restricted to campus users.
25
Reeves, Bryan Anthony. "Slope stability radar /". [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17049.pdf.
Pełny tekst źródła
26
Pere, Verne Harlan. "Antiscarp initiation and evolution". Thesis, University of Canterbury. Geological Sciences, 2009. http://hdl.handle.net/10092/3690.
Pełny tekst źródłaStreszczenie:
Antiscarps are defined here as any uphill facing scarp that may be observed on slopes, regardless of size or scale. They are not present on all slopes, but where they have been observed, they typically occur sub-parallel to the valley axis near the ridge crests in mountainous regions. Antiscarps are generally, but not exclusively, found in glaciated regions, where loading and unloading of the rock mass has effected changes to the in situ stress fields through cycles of compression and elastoplastic rebound and has also removed large volumes of material by the formation of cirques. Non-glacial antiscarps are commonly associated with tectonic activity. An extensive review of current literature has been used to assist in the identification of key parameters associated with antiscarps and to provide a basis for clearly defining the terminology used to address antiscarp related processes and features. All of the reviewed material has been collated into a chart where the factors that have been extracted from the articles are grouped and compared. The chart has been instrumental in selecting the nomenclature to be used when addressing different types of antiscarp and also in constraining the extent to which the term can be reasonably used. A flowchart has been developed to assist in the identification of the primary antiscarp forming process. The flowchart was successfully used to identify the primary processes associated with antiscarps observed in field studies in both the South Island of New Zealand and in the Scottish Highlands. Physical base friction models and numerical finite element modelling, using Plaxis v6.1 and FLAC 2D v3.40, both indicate that antiscarps can form solely under a gravitational load. Base friction models used individual elements of various geometries. Antiscarps formed in most of the models and were best identified in models that had a clearly defined discontinuity surface. The numerical models also indicate that shear along existing discontinuities is the dominant mode for the formation of antiscarps under a gravitational load in homogeneous massifs.
27
Chen, Ting. "Slope failure probability based on performance history in Hong Kong /". [Hong Kong] : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13671741.
Pełny tekst źródła
28
Kakarla, Kishan. "Numerical analysis of seepage in earth slopes". Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4078.
Pełny tekst źródłaStreszczenie:
Thesis (M.S.)--West Virginia University, 2005.Title from document title page. Document formatted into pages; contains x, 150 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 72-73).
29
Fadlelmula, Fadlelseed Mohamed Mohieldin. "Probabilistic Modeling Of Failure In Rock Slopes". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608549/index.pdf.
Pełny tekst źródłaStreszczenie:
This study presents the results of probabilistic modeling of plane and wedge types of slope failures, based on the &rdquoAdvance First Order Second Moment (AFOSM)&rdquo
reliability method. In both of those failure types, two different failure criteria namely, Coulomb linear and Barton Bandis non-linear failure criteria are utilized in the development of the probabilistic models. Due to the iterative nature of the AFOSM method, analyzing spreadsheets have been developed in order to carry out the computations. The developed spreadsheets are called &ldquo
Plane Slope Analyzer (PSA)&rdquo
and &ldquo
Wedge Slope Analyzer (WSA)&rdquo
. The developed probabilistic models and their spreadsheets are verified by investigating the affect of rock and slope parameters such as, ground water level, slope height, cohesion, friction angle, and joint wall compressive strength (JCS) and their distribution types on the reliability index (&
#946
), and probability of slope failure (PF). In this study, different probability distributions are used and the inverse transformation formulas of their non-normal variates to their equivalent normal ones are developed as well. In addition, the wedge failure case is also modeled by using system reliability approach and then the results of conventional probability of failure and the system reliability approach are compared.
30
Altinakar, Mustafa Siddik. "Weakly depositing turbidity currents on small slopes". Online version, 1993. http://bibpurl.oclc.org/web/26138.
Pełny tekst źródła
31
Jessop, David Edward. "On flows of fluidised particles down slopes". Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500418.
Pełny tekst źródła
32
Liu, Zhina. "Kinematics and Internal Deformation of Granular Slopes". Doctoral thesis, Uppsala universitet, Institutionen för geovetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-223792.
Pełny tekst źródłaStreszczenie:
Flow-like mass movement is the most destructive landslide and causes loss of lives and substantial property damage throughout the world every year. This thesis focuses on the spatial and temporal changes of the mass movement in terms of velocity and displacement within the failure mass, and the spatial and temporal distribution of the three dimensional internal deformation of the granular slopes using discrete element method, physical experiments, and natural landslides. We have also studied the effect of weak horizons on the kinematics and internal deformation of granular slopes. Numerical model results show the following features related to a failure mass. The failure mass flows downwards in an undulating pattern with a distinctive velocity heterogeneity. Dilatation within the failure mass is strongly dependent on its mechanical properties. A larger mass moves downslope and the mass moves faster and further in the model with lower internal friction and cohesion. The presence of weak horizons within the granular slope strongly influences displacement, location of the failure surface, and the amount of the failure mass. In addition, results from analogue models and natural landslides are used to outline the mode of granular failure. The collapse of granular slopes results in different-generation extensional faults in the back of the slope, and contractional structures (overturned folds, sheath folds and thrusts) in the toe of the slope. The first-generation normal faults with a steep dip (about 60º) cut across the entire stratigraphy of the slope, whereas the later-generation normal faults with a gentle dip (about 40º) cut across the shallow units. The nature of the runout base has a significant influence on the runout distance, topography and internal deformation of a granular slope. Good agreements are found between models and nature for the collapse of granular slopes in terms of the similar structural distribution in the head and toe of the failure mass and different generations of failure surfaces. The presence of a weak horizon within the granular slope has a significant influence on the granular failure and three dimensional internal deformation of the failure mass.
33
Glendinning, Stephanie. "Deep stabilisation of slopes using lime piles". Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/6951.
Pełny tekst źródłaStreszczenie:
A comprehensive review of the literature provided much evidence of the success of lime piles in treating both soft ground and slopes. The mechanisms of stabilisation postulated by researchers is often contradictory or misleading. The use of the literature for the basis of a definitive experimental programme was not possible. An iterative approach was adopted for the laboratory programme whereby the results from one series of tests were used in the design of the next. This resulted in a range of tests including full-scale box loading tests in which lime piles were installed in clay samples, model scale lime pile tests and soil element tests. The stabilising mechanisms that have been established by the laboratory study are: generation of negative pore water pressure, overconsolidation of the shear zone, clay dehydration, pile strength and increased strength of stabilised clay due to lime migration. These mechanisms combine to improve any particular clay slope containing one or more shear zones. Three field trials were conducted. A small-scale trial was carried out on a canal cutting and provided useful data regarding pore water pressure changes and installation processes. Quantitative data produced by the laboratory study, were used to design two further trials. One trial treated a 30 m stretch of failing slope using a single 'Minuteman' rig (small and lightweight plant). Quicklime was 'poured' into open holes and compacted by the drill operators. Work was complete within two weeks. The third trial, again sited on a canal cutting, was carried out using a much larger rig. One hundred and fifty 200 mm diameter piles were constructed to a depth of 3 metres within a two week period. Monitoring of pore water pressures on both sites is still occurring on a regular basis. Excavation of sections of both trials at some future date will provide additional data on stabilising mechanisms. The research has considerably extended the understanding of the mechanisms controlling lime pile stabilisation, particularly when applied to failing slopes in British soils. Areas where further research would improve this understanding have been highlighted and in some cases work is already underway.
34
Noori, B. M. A. "Investigation of stepped blocks protecting weir slopes". Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370369.
Pełny tekst źródła
35
FABRICIO, JOAO VICENTE FALABELLA. "PROBABILISTIC ANALYSES OF SLOPES AND RETAINMENTS STABILITY". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8888@1.
Pełny tekst źródłaStreszczenie:
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROOs projetos geotécnicos são, em geral, avaliados através do cálculo de um coeficiente de segurança, obtido de forma determinística. A presente pesquisa tem como objetivo a comparação de dois métodos probabilísticos (Estimativas Pontuais e Segundo Momento) empregados em análises de estabilidade. Os métodos probabilísticos quantificam as incertezas oriundas da variabilidade dos parâmetros geotécnicos, calculando-se um índice de confiabilidade (beta), que expressa o quanto o fator de segurança é confiável. No entanto, o índice b é um parâmetro relativo, pois não exprime todas as incertezas contidas em um projeto geotécnico. O trabalho apresenta uma comparação das análises probabilísticas de estabilidade da barragem de Curuá-Una, no Pará, e de um muro de arrimo, em São Fidélis, no Estado do Rio de Janeiro. No caso da barragem, estudou-se a influência de um eventual aumento no nível d´água do reservatório no cálculo da probabilidade de ruptura. Para o muro, foram consideradas diversas alturas do nível d´água no retroaterro a montante. As análises enfocaram, ainda, detalhes dos métodos probabilísticos, no que se refere à aplicabilidade para projetos práticos. Verificou-se que o método do Segundo Momento é de mais fácil utilização em geotecnia. Recomenda-se, portanto, a sua aplicação em conjunto com as análises determinísticas, mais usuais na prática.
Geotechnical projects are generaly assessed through the calculus of the safety factor obtained by deterministic methodologies. The purpose of the present research work is to compare two probabilistic methods (Estimate Punctual and Second Moment) employed in stability analyses. Probabilistic methods quantify the uncertainties derived from the variability of geotechnical parameters, calculating a confidence ratio that expresses how reliable the safety factor is. However, the ratio is a relative parameter, since it does not account for all the uncertainties contained in a geotechnical project. In view of this situation, the study compares the stability probabilistic analyses of Curuá-Una dam, in Pará, and those of a retaining wall in São Fidélis, Rio de Janeiro. Regarding the dam, the influence of a possible rise in the resevoir water level in the calculus of failure probability has been investigated. In respect to the wall, several water levels have been considered in the upstream backfill. Moreover, the analyses have focused on the details of probabilistic methods and their application to practical projects. It has been verified that the Second Moment Method is more easily employed in geothecnics. Therefore, it is recommended that it should be applied together with the deterministic analyses currently used in practice.
36
Langmaak, Kai Rainer. "Incipient motion of riprap on steep slopes". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85816.
Pełny tekst źródłaStreszczenie:
Thesis (MEng)--Stellenbosch University, 2013.ENGLISH ABSTRACT: Riprap is commonly used as an erosion protection measure around the world. In some cases, for example when constructing bed arrestors, riprap has to be designed to be stable on steep slopes. The literature shows that the problem of incipient motion is reasonably well understood, but existing hydraulic design methods are found to be largely unreliable. The main objective of this study is to improve the understanding of the different factors affecting incipient motion in order to furnish the prospective design engineer with a reliable method for sizing riprap on steep slopes adequately. Eight existing theories dealing with the threshold of incipient motion are reviewed, of which Liu’s work (1957) seems most promising. Naturally, the required median rock diameter of the riprap is reasonably large (due to the steep slopes), with high particle Reynolds numbers. However, little data is available for these flow conditions. Data collected from 12 large scale laboratory tests carried out for this research indicate that the dimensionless Movability Number is in fact constant for large particle Reynolds numbers. For design purposes, the recommended Movability Number which emerged from this study is 0.18, provided that the steep bed slope is taken into account, and that the theoretical settling velocity is calculated using an accurate drag coefficient and the d90 sieve size. A comparison of the laboratory data with design equations showed that a large variety of results are obtained, which supports the need for this study. Finally, it was shown that a calibrated one dimensional hydrodynamic model can be used by the practicing engineer to extract the hydraulic properties needed for applying Liu’s theory. It was found that the ratio ks/d90 = 0.81 may be applied to estimate the bed roughness for the grading used in this study.
AFRIKAANSE OPSOMMING: Stortklip is ‘n metode wat wêreldwyd gebruik word om erosie te voorkom. In sommige gevalle, byvoorbeeld vir die konstruksie van erosietrappe, moet stortklip teen steil hellings spesifiek ontwerp word om stabiliteit te verseker. Die literatuur beskryf die probleem van aanvanklike beweging redelik goed, maar dit is bevind dat die bestaande ontwerpmetodes grotendeels onbetroubaar is. Die hoofdoelwit van hierdie ondersoek was om die faktore wat beweging van stortklip veroorsaak, beter te verstaan en ‘n betroubare metode te ontwikkel wat ’n ingenieur kan aanwend om stortklipbeskerming wat op steil hellings geplaas word te ontwerp. Agt verskillende metodes wat die begin van beweging beskryf is bestudeer, en dit wil voorkom asof die Liu teorie van 1957 die grootste potensiaal het. As gevolg van die steil hellings wat ondersoek word, is die benodigde klipgroote redelik groot wat weereens die oorsaak is vir ‘n hoë deeltjie Reynolds getal is. In die literatuur kon geen data gevind word vir so ‘n vloeitoestand nie. Daarom is 12 laboratoriumtoetse gedoen en daar is gevind dat die Mobiliteitsgetal redelik konstant is vir groot deeltjie Reynoldsgetalle. Vir onwerpdoeleindes word ‘n Mobiliteitsgetal van 0.18 aanbeveel, met die voorwaarde dat die bodemhelling in ag geneem word, en dat die teoretiese valsnelheid bereken word met die d90 klipgroote en ‘n akkurate sleurkoëffisiënt. Verder is gevind dat die labaratorium data die voorspellings van die bestaande ontwerpvergelykings nie bevredigend pas nie. Dit ondersteun die behoefte vir hierdie studie. Om die bogenoemde bevindings vir praktiese probleme bruikbaar te maak, is daar gewys dat ‘n gekalibreerde een dimensionale hydrodinamiese rekenaarmodel gebruik kan word om die nodige hidrouliese eienskappe te verkry om die Liu teorie toe te pas. Dit is bevind dat die verhouding ks/d90 = 0.81 ‘n goeie benadering vir die hidrouliese ruheid kan voorsien.
37
Carr, Jeffery A. "Harvesting impacts on steep slopes in Virginia". Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42203.
Pełny tekst źródła
38
Tsiampousi, Aikaterini. "Numerical analysis of slopes in unsaturated soils". Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6885.
Pełny tekst źródłaStreszczenie:
Conventional constitutive models developed for saturated soils are inadequate when analysing problems involving unsaturated conditions. Although unsaturated constitutive models are available in the Imperial College Finite Element Program (ICFEP), there are aspects of unsaturated soil response that are not adequately simulated. The aim of the present thesis is to develop and implement numerical expressions describing the most relevant of these features and to apply them in combination with the existing ICFEP capabilities to boundary value problems involving unsaturated soils. The over-prediction of the peak shear stress exhibited by overconsolidated soils and the simplicity of the soil-water retention relationship employed, constitute the focal points of the improvements suggested. A new surface is introduced to substitute for the yield and plastic potential functions on the dry side of critical state, in order to prevent the available constitutive models from overestimating the peak deviatoric stress. The development, implementation and calibration of this surface are presented, followed by analyses of laboratory experiments demonstrating the improved simulation of soil behaviour. Novel formulations are proposed for the soil-water retention curve, which defines the relationship between the degree of saturation or the water content and the applied suction, modelling its hysteretic nature and incorporating the effect of specific volume. Ultimately, a three-dimensional hysteretic surface, defined in terms of degree of saturation, suction and specific volume, is presented. The new developments are subsequently applied to the numerical analysis of boundary value problems involving (a) the stability of slopes in overconsolidated unsaturated soils and (b) the behaviour of unsaturated soil slopes under seasonal changes of suction, highlighting the importance of adopting appropriate constitutive models.
39
Gao, Xiang. "Hydrodynamics of HCP with slopes and bends /". free to MU campus, to others for purchase, 1999. http://wwwlib.umi.com/cr/mo/fullcit?p9962524.
Pełny tekst źródła
40
Admassu, Yonathan. "Developing Design Methodology for Cut Slopes in Ohio". Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1279208895.
Pełny tekst źródła
41
Jarvis, Jeremy James. "Large scale toppling failure in metamorphic rock slopes". Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/11287.
Pełny tekst źródła
42
Ahmed, A. F. "Stability of riprap side slopes in open channels". Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380141.
Pełny tekst źródła
43
SILVEIRA, CARLOS ATALIBA BORGES. "STABILITY ANALYSIS OF SOIL SLOPES UNDERMINED BY VOÇOROCAS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=2065@1.
Pełny tekst źródłaStreszczenie:
ELETROBRAS TERMONUCLEAR S.A - ELETRONUCLEARNeste trabalho o método dos elementos finitos é empregado para analisar a estabilidade de taludes em solo solapados por voçorocas. Muitos dos deslizamentos de solo que ocorrem em taludes e encostas têm sido causados pelo fenômeno de voçorocas, o resultado de um processo de erosão de solos muito complexo. Uma breve revisão sobre a formação e o crescimento de voçorocas, bem como sobre os seus efeitos na estabilidade de taludes em solo, é feita neste trabalho. Exemplos ilustrativos da aplicação desta técnica para alguns casos de taludes e encostas erodidos por voçorocas são apresentados, incluindo-se duas análises numéricas da estabilidade de encostas situadas na cidade de Goiânia - GO. Dificuldades numéricas devido à baixa taxa de convergência da solução nas proximidades do colapso do talude são também discutidas.
In this work the finite element method is employed to analyze the stability of soil slopes undermined by voçorocas (gulling). Many of the shear slides occurred in both natural slopes and embankments have been caused by the phenomenon of voçorocas, the outcome of a very complex soil erosion mechanism. A brief review about the formation and growing of voçorocas, as well as an overview of their effects on soil slope stability, are made in this work. In the numerical simulation by the finite element method, the potential slip surface is identified through the progressive formation of a region of yielded soil as the erosion process advances. A simple model, consisting of incremental excavations of soil near the foot of the slope, is used in this work to represent the undermining mechanism. Illustrative examples of this technique are presented for some cases of natural soil slopes eroded by voçorocas in the city of Goiania - GO. Numerical difficulties due to the poor convergence of the solution near the soil collapse are also discussed.
44
Reddi, Lakshmi Narayana. "Probabilistic analysis of groundwater levels in hillside slopes /". The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu148759070298994.
Pełny tekst źródła
45
Esterhuizen, Jacob J. B. "Progressive failure of slopes in lined waste impoundments". Diss., This resource online, 1997. http://scholar.lib.vt.edu/theses/available/etd-08032007-102247/.
Pełny tekst źródła
46
Kiriakidis, Longhi Ricardo Constantino. "Seepage in earth slopes with longitudinal drainage trenches". Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2555.
Pełny tekst źródłaStreszczenie:
Thesis (M.S.)--West Virginia University, 2002.Title from document title page. Document formatted into pages; contains xii, 210 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 100-101).
47
Zhang, Jie. "Characterizing geotechnical model uncertainty /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202009%20ZHANG.
Pełny tekst źródła
48
Cheung, Wai Man. "Methodology for updating cut slope reliability based on observed performance /". View abstract or full-text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202003%20CHEUNGW.
Pełny tekst źródłaStreszczenie:
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 154-164). Also available in electronic version. Access restricted to campus users.
49
Khanchoul, Kamel 1959. "THE RELATIONSHIP BETWEEN LITHOLOGY AND SLOPE FORM IN THE TUCSON MOUNTAINS, PIMA COUNTY, ARIZONA". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276500.
Pełny tekst źródłaStreszczenie:
The relationship between lithology and slope morphology is investigated at eight sites on granitic, andesitic, and sedimentary rock slopes in the Tucson Mountains. Several methods are used in the study. Topographic profiles are constructed. Skewness indices of the slope shapes, maximum and minimum slope angles, and slope lengths of the different slope profiles are computed and compared with each other. Debris size analysis is done to better determine hillfront/piedmont junctions. Slope surface regularities of the three lithological slopes are analysed and compared. The results show that the granitic piedmont slopes are found to be slightly concave to almost rectilinear, indicating their high resistance to erosive processes. In contrast, the concavity of the andesitic and sedimentary piedmont slopes demonstrate their inability to resist the erosive attack on them. However, in the case of the hillfront slopes, slope forms do not reflect lithological variations.
50
Yip, Tat-wing Francis. "The effect of water to the stability of man-made slope in Hong Kong". Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B43895219.
Pełny tekst źródła