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 37 for “"sediment delivery"”.
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Simulation of local watershed nutrient and sediment delivery to Lake Texoma.
A hydrologic model and watershed export model was used to estimate the loading of nutrients and total suspended solids from un-gaged local watersheds associated with Lake Texoma. Discharge to the reservoir from local watersheds was predicted using a modification of the curve number method in HEC …
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Hydroclimatic influences on suspended sediment delivery in a small, High Arctic catchment
A study of suspended sediment transport dynamics was undertaken in the West River at Cape Bounty, Melville Island, Nunavut. Hydrometerological conditions and sediment transport were measured over three seasons in order to characterize suspended sediment transport and grain size characteristics in …
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Numerical Modelling of Sediment Delivery from Tidewater Glaciers to the Marine Environment
Glaciated fjords are dynamic sedimentary environments with high deposition rates, thus providing high-resolution sedimentary records of deglaciation. This thesis introduces two numerical models, SedBerg and SedPlume, developed to simulate marine sedimentation from tidewater glaciers for the …
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Sediment Delivery from Reopened Forest Roads at Stream Crossings in the Virginia Piedmont Physiographic Region, USA
… In this research, annual and event-based sediment delivery rates were estimated for reopened legacy roads at forest stream crossings in the Virginia Piedmont physiographic region, USA. Sediment delivery rates were compared among stream crossing approaches with diverse intensities of best …
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Sediment Delivery Ratios and Areas of Forest Operational Features by Physiographic Groupings in the Southeastern U.S.
… have the potential to influence erosion and sediment deposition in streams. Forestry best management practices (BMPs) were created to minimize the effects of harvesting operations on sedimentation and are implemented at varying levels throughout the Southeastern U.S. We quantified the area of …
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Potential Effects of Forestry Best Management Practices and Implementation Rates on Soil and Water Resources in the Southeastern United States
… quality from nonpoint source pollutants (NPSP). Sediment is the most common NPSP associated with forest operations, and BMPs are implemented primarily to reduce erosion and potential sediment delivery to streams. Skid trails, stream crossings, forest roads, decks, and harvest areas are major …
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Changes in landuse patterns in upland watersheds of Eastern Luangwa Valley, Zambia, and the potential impact on runoff and erosion
… land use and topography on runoff, erosion and sediment delivery. Landuse was delineated from 2007 IKONOS image (one meter pixel), and Landsat imagery was used to depict the historic changes in landuse between the period of 1989 and 2007. The GWLF model was used to predict the impact of the …
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Soil Erosion from Forest Haul Roads at Stream Crossings as Influenced by Road Attributes
… and stream crossings can be important sources of sediment in forested watersheds. The purpose of this research was to compare trapped sediment and forestry best management practice (BMP) effectiveness from haul road stream crossing approaches and ditches. The three studies in this dissertation …
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Why Are Some Watersheds More Sediment-Productive Than Others? An Explainable AI Approach
The Sediment Delivery Ratio (SDR) represents the proportion of eroded sediment within a watershed that ultimately reaches its outlet. Sediment yield (SY) is defined as the amount of sediment exported from a watershed outlet per unit time, normalized by drainage area. Quantifying the spatial …
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Granger Lake Sedimentation and Watershed Conservation Implementation Assessment
Sedimentation rates for many Texas reservoirs may be skewed by overstated estimates of design capacity and assumptions perpetuated through subsequent volumetric surveys. Multi-frequency reservoir surveys offer the means by which we may improve existing reservoir data and validate historic …
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Quaternary geology and glacial history of the Haliburton region, south central Ontario, Canada: A model for glacial and proglacial sedimentation
The pattern of glacigenic sedimentation in the Haliburton region suggests that stagnation is an important element in the regional style of deglaciation in areas of moderate bedrock relief (50-150 m), such as the shield terrane of southern Ontario. The record of subglacial processes and sub-ice …
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Exploring equifinality in a landscape evolution model
… at 100,000 years are summarised by four metrics (sediment yield, drainage density, sediment delivery ratio, and a topographic metric), which serve as landscape descriptors.<br/>Equations, or “metamodels”, are derived by regression to describe each metric as a function of the GOLEM parameters, and …
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Areal Modeling of Erosion for Environmental Nonpoint Applications (AMEENA)
Erosion and sediment delivery from upland areas to waterbodies is a major problem impacting water quality in the United States and elsewhere. Measures to reduce these impacts are either targeted at reducing erosion on-site or at reducing delivery of sediment to waterbodies. AMEENA (Areal Modeling …
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The transient response of bedrock river networks to sudden base level fall
… stability of mountain ranges and the tempo of sediment delivery to depositional basins. As this incision signal propagates through the river network, its upstream extent is often recognized as a discrete, steep convexity in the channel profile, defined here as a knickpoint. In this thesis, …
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The effect of anthropogenic development on sediment loading to bays on St. John, U.S. Virgin Islands
… the impact of anthropogenic development on sediment delivery rates to bays on St. John, U.S.V.I., I developed a sediment loading prediction model. Based on the modified universal soil loss equation, this model predicts sediment loading using watershed parameters, including the soil type, …
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Skid Trail Stream Crossing Closure Techniques for Protecting Water Quality
… having the greatest potential to produce sediment by way of non-point source pollution. The stream crossing portion of a skid trail is where sediment delivery is most likely to occur. Forestry Best Management Practices (BMPs) have been developed by most states to reduce both erosion and …
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Geospatial analysis of specific degradation in South Korea
… Korea experienced many local and concentrated sediment problems such as landslides, upland erosion, rills and valleys, aggradation/degradation, and flood plain sediment deposition. These problems vary in space and time, therefore a reliable and consistent approach to model sediment processes is …
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Evaluation of road erosion prediction models applied to unpaved roads in a small tropical watershed in Eastern Brazil
… roads which can be the largest contributor of sediment loading within a watershed in terms of both sediment generation and delivery. A number of erosion and sediment prediction models have been developed for unpaved roads and applied across a wide range of locations. However, little work has …
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Implications of Best Management Practices on Channel Evolution within the Bad River Watershed: West Central South Dakota
… regional relationships between channel form and sediment conveyance. The Bad River located in west central South Dakota has chronic high sediment loads attributed to the surrounding fragile landscape coupled with historic overgrazing. High sediment loads coming from bed and bank erosion of …
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