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 99 for “"Sediment supply"”.
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Sediment Supply Effects On thePlio-Pleistocene Stratigraphic Evolution of the Douala Basin, West Africa
… penetrating the Pliocene and Pleistocene (2300m) sediments, this study presents the stratigraphic evolution of the petroliferous Douala Basin, West Africa in response to the sediment supply increase triggered by the Pliocene and Pleistocene sea level changes. Our data show that the stratigraphic …
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Relative sea level, sediment supply and barrier dynamics as driving mechanisms of Holocene coastal change.
… by investigating the role of relative sea level, sediment supply and barrier dynamics as driving mechanisms of Holocene coastal change. The Suffolk coast, an understudied and vulnerable section of coastline in southeast England, is used as a case study to improve understanding of the mechanisms …
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Suspended sediment supply dominated by channel processes in a low-gradient agricultural watershed, Wildcat Slough, Fisher, IL, USA
… through the soil profile and adsorption to fine sediments, respectively. This study estimates the relative contribution of suspended sediment from various land use types entering into the Wildcat Slough, a low gradient, intensively managed 61.3 km2 watershed in the Upper Sangamon River Basin in …
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The role of sediment supply and sea-level changes on a submerging coast, past changes and future management implications
… to establish the variation of sea level change, sediment supply and geological control from the Late-Holocene, through the Historical period to the Present day, in Sanday. Techniques such as Ground-Penetrating Radar and geomorphological Radar and geomorphological surveying have identified a suite …
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Late Quaternary marine deposits, offshore central Texas: Processes controlling geometry, distribution, and preservation potential
The interplay of sediment supply, accommodation space, and the rate of sea-level rise and fall, determine the thickness and overall extent of offshore deposits along the central Texas shelf. Analysis of near-shore sediment cores suggests that transgressive and highstand shorelines prograded during …
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Late Quaternary Evolution and Stratigraphic Framework Influence on Coastal Systems along the North-Central Gulf of Mexico, USA
… in the Gulf of Mexico are threatened to reduced sediment supply, storm impacts and relative sea level rise (RSLR). The geologic record can provide insights of geomorphic threshold crossings (formation, progradation, transgression, destruction) to these forcing mechanisms to predict future barrier …
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Evaluating the role of sediment supply in the development of foreland basin fill: an example from a low-accommodation clastic wedge in the Cordilleran foreland basin, Mesa Verde Group, Utah-Colorado
Includes bibliographical references (leaves 125-131).
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Numerical Modelling of Braiding Processes in Gravel-Bed Rivers
… linked to abrupt changes in flow or sediment supply, the lack of a theoretical basis underpinning the development and maintenance of braiding makes identification of the cause and effect of channel metamorphosis hazardous. A growing body of research has suggested that the transition …
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Configuration of the Pleistocene Surface Beneath Cat Island, Mississippi and Implications for Barrier Island Formation and Evolution
… by providing an elevated base, nucleus for sedimentation and local sediment supply. Investigation of barriers' subsurface geology provides insight into island formation and evolution. High-resolution shallow seismic data acquired in the island's nearshore zone and interior canals, correlated …
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Analysis of sediment dynamics in intensively managed landscapes
The flux of fine sediment within agricultural watersheds is an important factor determining the environmental quality of streams and rivers. Human activity has significantly altered the hydrological and biogeochemical cycles within terrestrial and aquatic environments through agricultural …
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Suspended-sediment characteristics in four humid tropical watersheds of contrasting land use, Puerto Rico
A hypothetical model of sediment production, delivery, and transport in the humid-tropics of Puerto Rico was developed through statistical analysis of storm-generated sediment loads and hydrologic characteristics from three time categories: (1) the current storm-generated event, (2) previous …
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Estimating Embeddedness From Bankfull Shear Velocity in Gravel Streambeds to Assess Sediment Impacts on Aquatic Biota
… and macroinvertebrates are responsive to fine sediment in streambeds. Excess fine sediment (<2mm in diameter) impairs over 40,000 miles of streams in the U.S., degrading habitat quality for many aquatic species. Embeddedness (emb, %), a measure of fine sediment in gravel bed streams, is …
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Late Quaternary variability in coastal changes along the Texas Gulf coast
… forcings such as relative sea-level and sediment supply, and internal (autogenic) basinal mechanisms such as antecedent topography, regional subsidence, wave climate, offshore profile, and anthropogenic effects. The central Texas coast is characterized by stable barriers whereas the upper …
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Laboratory experiments on alluvial cover in mixed bedrock-alluvial meandering channels and on the formation and evolution of supraglacial meltwater meandering streams
… form and evolve by erosion and deposition of sediment, and by interactions with riparian vegetation. Meandering channels also form in bedrock where the driving processes include dissolution, abrasion by sediment particles, plucking of bedrock, and weathering. Rivulets on a plane can also …
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Modeling Soil Erosion in the Upper Green River, KY
… throughout the United States, contributing sediments to channels mainly as nonpoint pollution resulting from land-use and agricultural practices and leading to sedimentation downstream and downwind, a decrease in the transport capacity of streams, increase in the risk of flooding, filling …
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Quaternary landscape evolution, pedology, and geoarchaeology in central Texas.
… complex story of climate and hydrologic changes, sediment supply, and human interaction. From >60 ka near the transition of MIS 5 to 4 to historic times through the end of MIS 1, the stream systems have recorded changes as rivers incised and aggraded.
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Sedimentological Characteristics and 3-D Internal Architecture of Washover Deposits from Hurricanes Frances, Ivan, and Jeanne
… the spatial depositional patterns and internal sedimentary architecture of fresh washover deposits resulting from inundation to collision regime overwash events. Sedimentological characteristics and 3-D internal architecture of the washover deposits were studied through coring, trenching, …
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Sediment Dynamics in a Dryland River: Grain-Size Variations, Erosion Rates, Sediment Mixing and Dam Effects
… infrequent floods often set channel form and sediment grain size patterns for long periods of time. The large natural variability in dryland river stream flow causes susceptibility to geomorphic alteration when they are dammed. Cosmogenic nuclide analysis, a tool for determining catchment-wide …
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Sediment Dynamics in a Dryland River: Grain-Size Variations, Erosion Rates, Sediment Mixing and Dam Effects
… infrequent floods often set channel form and sediment grain size patterns for long periods of time. The large natural variability in dryland river stream flow causes susceptibility to geomorphic alteration when they are dammed. Cosmogenic nuclide analysis, a tool for determining catchment-wide …
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