Author : Brantley Allison Thames
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (68 download)
Book Synopsis The Effects of Urbanization on the Streambed Sediment Characteristics in a Ridge and Valley Watershed by : Brantley Allison Thames
Download or read book The Effects of Urbanization on the Streambed Sediment Characteristics in a Ridge and Valley Watershed written by Brantley Allison Thames and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Urbanization causes flow and sediment regime changes, which leads to alterations in the bed sediment characteristics and degradation of the ecological habitat. Evidence shows that changes in the characteristics of streambed sediment occur in urbanized watersheds; however a link between urbanization and changes in streambed sediment is not well established in the literature. Limited support in the literature does suggest that urbanization is linked to a decline in the diversity of algae, invertebrate, and fish populations. Relationships between urbanization and bed sediment characteristics were explored by three studies using the AnnAGNPS and CONCEPTS models. AnnAGNPS is a GIS-based sediment delivery model with land erosion rates determined by the revised Universal Soil Loss Equation (RUSLE) and sediment yield rates determined by the Hydrogeomorphic USLE (HUSLE) for watersheds primarily dominated by agricultural land use. CONCEPTS is a sediment transport and channel adjustment model that routes sediment input from AnnAGNPS and sediment inputs from channel bed and bank erosion. Both models were developed by the United States Department of Agriculture -- Agricultural Research Service (USDA ARS). The research objectives for this project included: 1) conducting a sensitivity analysis of the AnnAGNPS and CONCEPTS models to evaluate the significance of various model inputs that incorporate the mosaic of urban land use and require field measurements for the non-urbanized and urbanized subwatersheds, 2) producing and executing several combinations of model run simulations with altered runoff and erosion from the hillslope using the entire AnnAGNPS-CONCEPTS modeling couple to simulate varying levels of urbanization, and 3) evaluating AnnAGNPS model results of 15 urban and non-urban subwatersheds ...