Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"fluvial erosion"”.
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Equilibrium and transient morphologies of river networks : discriminating among fluvial erosion
… adjustment to a change in the forces that drive erosion can yield surprising results. Adjustments in grain size can lead to spatially variable channel concavity and larger trans port rates on shallower slopes. As a consequence, equilibrium channel slopes may decrease under higher uplift …
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Temporal and Thermal Effects on Fluvial Erosion of Cohesive Streambank Soils
… United States, the annual cost of on-site soil erosion problems such as soil and nutrient losses, and off-site soil erosion problems such as sedimentation of lakes and river, loss of navigable waterways, flooding and water quality impairment, has been estimated at 44 billion USD (Pimentel, 1995; …
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Constraining the average fill densities of Mars' lowlands and fluvial erosion of Titan's polar regions.
… Solar System where we have observed widespread fluvial activity. In this thesis I present two approaches for constraining the extent of multiple resurfacing processes in order to gain insight into the early history of Mars and Titan. One of the most distinctive features of the Martian surface is …
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Do Roots Bind Soil? Comparing the Physical and Biological Role of Plant Roots in Streambank Fluvial Erosion
… and biological effects of roots on streambank fluvial erosion. A series of laboratory-scale erosion tests were conducted using a mini jet erosion testing device and a recirculating flume channel to address this goal. Several soil and vegetation factors that influence fluvial entrainment, like …
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Effect of water temperature on cohesive soil erosion
… />effect of water temperature on cohesive soil erosion should be explored. The objectives of this study are to: determine the effect of water temperature on the erosion rates of clay; determine how erosion rates vary with clay mineralogy; and, explore the relationship between zeta potential and …
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Modelling near-bank flow hydraulics
River bank erosion models are a fundamental requirement for understanding the migration and evolution of river meanders, estimating the potential for land-loss and threat to floodplain infrastructure, and predicting the delivery of contaminated floodplain sediments to aquatic ecosystems. While …
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GEOMORPHOLOGICAL MAPPING OF THE K2 AREA, PAKISTAN USING GIS AND REMOTE SENSING
… of glaciation, mass movement denudation, and fluvial erosion in landscape development. A series of thirteen 1:100,000 geomorphological maps covering the area between Skardu and K2 were produced using field mapping and photography, GPS measurements, ASTER satellite imagery, and digital …
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GEOMORPHOLOGICAL MAPPING OF THE K2 AREA, PAKISTAN USING GIS AND REMOTE SENSING
… of glaciation, mass movement denudation, and fluvial erosion in landscape development. A series of thirteen 1:100,000 geomorphological maps covering the area between Skardu and K2 were produced using field mapping and photography, GPS measurements, ASTER satellite imagery, and digital …
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Applying GIS Metrics to Determine Degree of Glacial Modification in Mountainous Landscapes
… to determine the relative impact of glacial vs. fluvial erosion on the development of the basin landscape.</p>
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The coupled development of terrain and vegetation : the case of semiarid grasslands
… by vegetation, mainly because vegetation reduces fluvial erosion. This thesis presents the study of the bidirectional interaction between vegetation and the land form in semiarid grasslands. Remotely sensed data and digital elevation maps are used to infer the relationship between vegetation cover …
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Headcut retreat resulting from plunge pool erosion in a 3D landscape evolution model
… using existing concepts about this type of erosion. The model estimates retreat rates, given flow, height of the headcut, upstream slope and Manning's roughness, and the relevant soil parameters (erodibility and critical shear stress). The model was analyzed to study its behavior as its …
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Influence of spatially variable precipitation on passive margin escarpment evolution
… challenges conventional understanding of fluvial erosion. Typical explanations for passive margin escarpments rely on lithospheric flexure and fluvial network geometry. I suggest a role for interactions between climate and landscape evolution motivated by the Western Ghats of India. The …
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Meander migration with physically-based bank erosion
… sediment transport, bed morphodynamics, and bank erosion -- the latter still needs a considerable amount of research, especially with regards to how the different processes responsible for bank erosion and retreat impact meander migration patterns. In this thesis, the model RVR Meander is further …
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Signatures of land-ocean interactions in coastal morphology
… Chapter 3 explores the geometric signatures of fluvial erosion within reef morphology in the Society Islands, establishing spatial correlations between major island drainage basins and reef passes, deep channels that dissect the reef flat. Chapter 4 evaluates the relative contributions of …
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An archaeological reconnaissance of the Lake Diefenbaker region in south central Saskatchewan
… were recorded. At the same time, the rates of erosion for various landforms along the eastern shoreline of the reservoir were measured at several of the heritage site locales. I determined that monitoring of the full extent of the reservoir is necessary to prevent the undocumented loss of …
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Evolution and Architecture of an Incised Valley in the Upper Cretaceous Eagle Formation in South-Central Montana
… km and include the regressive surface of marine erosion (RSE), sequence boundary (SB), and transgressive surface of tidal-fluvial erosion (TSE). Within this sequence stratigraphic framework, 4 facies association, internal lower-order architectures (i.e. channel forms, lateral accretion sets, …
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Evolution and Architecture of an Incised Valley in the Upper Cretaceous Eagle Formation in South-Central Montana
… km and include the regressive surface of marine erosion (RSE), sequence boundary (SB), and transgressive surface of tidal-fluvial erosion (TSE). Within this sequence stratigraphic framework, 4 facies association, internal lower-order architectures (i.e. channel forms, lateral accretion sets, …
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Under what conditions do parallel channel networks occur?
… generated using a detachment-limited model for fluvial erosion and a slope-dependent model for hillslope processes. The parameters of the model were determined to imitate the real basins, and the average slope of the pre-existing surface was used for the slope of the initial surface. Based on …
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Sub-Ice Relief and Geology of East Antarctica
… for the discussion of a probable pre-glacial fluvial erosion phase in the Transantarctic Mountains.
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Dinoflagellate cyst record and paleoceanography through the Pliocene–Pleistocene transition at ODP Site 1143, southern South China Sea
… accumulation rate as a result of increased fluvial erosion inferred to aid the rapid burial and preservation of these heterotrophic taxa, and 4) increased winter monsoon intensity inferred to facilitate the physical erosion and transport of sediments. Terrestrial palynomorphs generally …
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