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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 28 for “"sediment erosion"”.
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Sediment erosion and deposition within mangrove forests
… in their own biomass and by trapping carbon-rich sediment imported from outside the forest and deposited in the forest. Aboveground biomass, like mangrove pneumatophores (i.e., aerial roots), creates conditions that facilitate sediment deposition by enhancing drag and slowing currents near the …
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Suspended sediment erosion in laboratory flume experiments
… are used to examine the role of suspended sediment abrasion in bedrock channel erosion. A range of topographies was used, from a planar bed to a sinuous and scalloped inner channel. Experiments were run separately with bedload (used to form topography) and suspended load at a variety of …
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Sediment Erosion and Deposition Within Mangrove Forests
… in their own biomass and by trapping carbon-rich sediment imported from outside the forest and deposited in the forest. Aboveground biomass, like mangrove pneumatophores (i.e., aerial roots), creates conditions that facilitate sediment deposition by enhancing drag and slowing currents near the …
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Spatio-temporal analysis of coastal sediment erosion in Cape Town through remote sensing and geoinformation science
Coastal erosion can be described as the landward or seaward propagation of coastlines. Coastal processes occur over various space and time scales, limiting in-situ approaches of monitoring change. As such it is imperative to take advantage of multisensory, multi-scale and multi-temporal modern …
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An Improved Water-Driven Sediment Yield Model for Cold Agricultural Regions
Excessive transport of sediment in the world’s freshwater, typically from water-driven erosion occurring in agricultural regions, is a significant source of pollution and damage to the aquatic environment. Excess sediment erosion promotes the transport of phosphorus to lakes, which can increase …
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Breaching of earth embankments and dams
… improved approaches for flow calculation, sediment erosion and structural response for predicting breach initiation and growth and uses field data, including video footage, from the EU IMP ACT project and large scale test and case study data from collaboration with the International Dam …
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A Quantitative Analysis of the Geomorphic Agency of the Mud-Nesting Swallows in Central Texas
… dissertation provides a quantitative analysis of sediment erosion, transportation, and deposition conducted by the three mud-nesting swallows of Central Texas, namely the barn swallow (Hirundo rustica), the cave swallow (Petrochelidon fulva), and the cliff swallow (Petrochelidon pyrrhonota). The …
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Alluvial Sedimentation Associated with Logging in Low Gradient Watersheds in DeSoto National Forest, Mississippi
… properties, hillslope stability, and increase sedimentation rates in local streams and rivers. The aim of this research is to determine if forestry removal causes an increase of soil erosion and how it affects floodplain sedimentation in the low gradient watershed Whiskey Creek, located in …
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Downstream suspended sediment dynamics of reservoir sediment flushing
Reservoir sediment flushing is increasingly considered beneficial to reduce sedimentation of reservoirs and maintain sediment supply downstream of impounded rivers. Nevertheless, flushing of the accumulated sediments downstream of the dam also bears numerous negative impacts. In this study, first …
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Rates of hillslope lowering in the Badlands of North Dakota
… per year in the upper 2.5 inches of surficial sediment. Erosion perpendicular to the face of seepage steps is 0.29 inch per year. </p><p>The Sentinel Butte Formation has a lower rate of infiltration and percolation, which results in a higher rate of surface runoff than on the Tongue River …
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Sediment Control In Alluvial Rivers Using Simulation-Based Optimization
… watersheds, the peak runoff may creates excess erosion and deposition in channels or river reaches and cause changes in flow characteristics and fluvial geomorphology. Severe sediment erosion such as in-stream sever bed and bank erosion or gullying can threaten the stability of in-stream …
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Upstream Geomorphic Response to Dam Removal: The Blackfoot River, Montana
… the spatial and temporal pattern of reservoir sediment erosion and upstream channel evolution of the Blackfoot River, MT, following the 8 m base level reduction caused by the removal of Milltown Dam. Field data collected include surveys of channel bed topography and water surface elevation …
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Upstream Geomorphic Response to Dam Removal: The Blackfoot River, Montana
… the spatial and temporal pattern of reservoir sediment erosion and upstream channel evolution of the Blackfoot River, MT, following the 8 m base level reduction caused by the removal of Milltown Dam. Field data collected include surveys of channel bed topography and water surface elevation …
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The influence of macrofauna on intertidal sediment stability and biogeochemical properties.
… known to have a significant effect on intertidal sediment stability and biogeochemical properties. A series of manipulative in situ mudflat studies at Breydon Water, Great Yarmouth, UK investigated the effect of biodiversity on selected biogeochemical sedimentary properties related to mudflat …
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Evaluation of Coupled Erosional Processes and Landscape Evolution in the Teton Range, Wyoming
… climate or elevation regime. The focus of erosion by glacial, fluvial, or mass wasting processes is highly sensitive to small changes in boundary conditions, therefore spatial and temporal variability can be high when observed over short time scales. This work evaluated methods for …
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A synthetic unit sedimentgraph for ungaged watersheds
The concept of the unit sediment graph is important and useful in the study of non-point source pollutant transport, in the estimation of sediment yield and in the design of sediment basins. At the present time, a physically sound method of deriving unit sediment graphs for ungauged small …
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Simulating Anthropogenic and Climatic Influences On Fluvial Sediment Load In the Southeastern U.S. and Central Europe
<p>Quantifying variable riverine sediment discharge over time in response to climate and human pressure is crucial to understanding past, present and future patterns of sediment flux to the worlds' oceans. The need for this data is critical in light of changing anthropogenic activities, global …
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Application of Remote Sensing Techniques for the Study of Neotectonic Deformation, Subsidence and Coastal Processes
… change in the form of shoreline retreat and sediment erosion reduces the protective influence of barrier islands and their beach-dune systems. I conducted an uncrewed aerial vehicle (UAV) survey at these two sites and collected sediment samples for grain size analysis. Using the UAV data, I …
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Turbulence In Low Energy Lacustrine Environments At The Sediment-Water Interface
The sediment-water interface is an important region where biological, chemical, and physical processes occur. Fluid flow determines the ability of organisms to utilize the bottom sediments for food, shelter, and reproduction, the amount and rate of mass transfer between the sediment and bulk fluid, …
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Coupled Sediment Yield And Sediment Transport Model To Support Navigation Planning In Northeast Brazil
<p>Deposition of sediment (shoaling) in commercial waterways is a major obstacle to maintaining sustainable riverine transportation of bulk goods (primarily agricultural and mining commodities). The rate of aggradation of sediment in a waterway is directly related to both the rate of sediment …
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