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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
This thesis examines the procedures and relative merits of some of the methods available for sediment budgeting focusing on the middle Trinity River, Texas. These methods included analysis of historical sediment and flow gaging station data, GIS digitization of sand bars, and field measurement of sand bar storage. The gaging station data indicated the middle Trinity River acts as a sediment source for the lower reaches. To understand where this surplus of sediment is coming from, it was necessary to consider tributary loading data, GIS analysis of Natural Resource Inventory (NRI) erosion rates, and lake survey data. This information showed that sediment storage along the Trinity River is extensive. We infer that sediment in the middle Trinity River is most likely being sourced from the reworking of sediment as the river moves across the floodplain in addition to the river channel itself.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
This thesis examines the procedures and relative merits of some of the methods available for sediment budgeting focusing on the middle Trinity River, Texas. These methods included analysis of historical sediment and flow gaging station data, GIS digitization of sand bars, and field measurement of sand bar storage. The gaging station data indicated the middle Trinity River acts as a sediment source for the lower reaches. To understand where this surplus of sediment is coming from, it was necessary to consider tributary loading data, GIS analysis of Natural Resource Inventory (NRI) erosion rates, and lake survey data. This information showed that sediment storage along the Trinity River is extensive. We infer that sediment in the middle Trinity River is most likely being sourced from the reworking of sediment as the river moves across the floodplain in addition to the river channel itself.
Author: Leslie M. Reid Publisher: ISBN: Category : Erosion Languages : en Pages : 190
Book Description
Many land-management decisions would be aided by an understanding of the current sediment production and transport regime in a watershed and of the likely effects of planned land use on that regime. Sediment budgeting can provide this information quickly and at low cost if reconnaissance techniques are used to evaluate the budget. Efficient budget construction incorporates seven steps: careful definition of the problem to be addressed; collection of background information; subdivision of the project area into uniform sub-areas; interpretation of aerial photographs; fieldwork; analysis; and checking of results. Methods used in field-work and analysis must be selected according to the types of hillslope and channel processes active, the goals of the analysis, and the level of precision required. Methods for evaluating erosion and sediment transport rates are described, and four examples are given to demonstrate budget applications and construction.
Author: Amelia Deuell Rothleutner Publisher: ISBN: Category : Sediment transport Languages : en Pages : 494
Book Description
Evaluation of historical meandering since 1937 shows that the active floodplain of the middle reach Skagit River between Rockport and Sedro-Woolley, Washington, has periodically been a significant source of sediment to the lower Skagit River and delta. In response to recent findings that the Sauk-Suiattle on average only supplies approximately 30% of the sediment load observed at Mount Vernon, I examined the geomorphic change and potential sediment production of the middle reach to test whether it is a significant source to the lower river. I tested the hypothesis that the 20-mile (32-km) middle reach has been a net source of sediment to the delta, at least since the mid-2000s that comprehensive sediment load monitoring has been conducted at Mount Vernon. A new tool constructed with ArcGIS model builder that integrates analyses of lateral meander migration from aerial photogrammetry with digital elevation data (e.g. lidar) automates the calculation of sediment volume produced by bank erosion versus stored in bars, islands, and side channels through time. While the results reveal changes in net sediment production through time, they show that for the period 2006 through 2015, recruitment of floodplain sediment from the middle reach to the active channel produced ~27% of the annual sediment mean load measured at Mount Vernon. The sediment source was dominated by lateral incision at rates of 3-8 m/yr in several areas of high-relief (3-15 m) banks characterized by unconsolidated, friable glacial outwash or lahar deposits. Decadal-scale sediment production from the floodplain to the active channel associated with highest meander rates and storage within the reach correlate with periods of frequent moderate floods, whereas periods of net sediment export to the lower river correlate with highest peak flows that presumably erode and flush sediment from the system. These results help quantify recent channel dynamics, rates of change, and sources of sediment that influence sediment transport and recent sediment aggradation patterns downstream, that are in turn important to flood risk and salmon habitat. The results and model also help inform decision makers how these sources of sediment and their impacts may change with projected increases in the magnitude and frequency of floods and sediment production expected with climate change across the Pacific Northwest. The methods and model developed in this study can be readily applied to other systems with historical time-series of mapped floodplain and channel changes to evaluate sediment budgets and impacts to habitats associated with meandering behavior.
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Author: Michael C. Slattery
Author: Peter Wilcock
Author: Kyle Strom
Author: Leslie M. Reid
Author: Carolyn Cook
Author: Amelia Deuell Rothleutner
Author: 
Author: Michael C. Slattery
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