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Stream Bank Erosion Contributions to Sediment Loads in Jordan Creek, Alaska: DWSM-BE Based Assessment

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  International Symposium on Erosion and Landscape Evolution (ISELE), 18-21 September 2011, Anchorage, Alaska  711P0311cd Paper #11130.(doi:10.13031/2013.39189)
Authors:   Debabrata Sahoo, Debasmita Misra, Deva K Borah, Brock Tabor
Keywords:   Bank erosion, Hydrologic modeling, Overland erosion, Sediment transport, Watershed modeling

Jordan Creek is located in the city and borough of Juneau, Alaska with a drainage area of approximately 3 square miles. It was determined to be impaired as it did not meet Alaska State Water Quality standards for sediment and dissolved oxygen. In May of 2009, A TMDL was approved to address the impairment and improve water quality. Stream bank stabilization was noted as an opportunity for future implementation. Hence, the objective of this research is to apply the Dynamic Watershed Simulation Model with Bank Erosion (DWSM-BE) to Jordan Creek in order to simulate and quantify the streambank erosion percentage of the overall sediment deposited downstream of the Jordan Creek watershed. The objective will be accomplished by combining the DWSM (to simulate hydrology, upland and streambed erosion, and sediment transport) with a detailed stream sediment transport model STREAM (with capabilities of graded sediment transport, formation of bed armoring, and stream bank erosion). The combined model DWSM-BE will be applied to the Jordan Creek watershed. The results of this research will aid in identifying regions of the stream that need critical attention for stability. A brief description of the Jordan Creek watershed and its ongoing investigations and monitoring program are presented along with a brief description of the DWSM and STREAM and the ongoing steps in combining them and applying them to the Jordan Creek watershed. Results and findings will be presented at the conference.

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