Author(s): J. H. Pak; M. H. Fleming; W. A. Scharffenberg; P. B. Ely
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Keywords: No Keywords
Abstract: The effects of surface erosion and stream sediment loading in watersheds have become increasingly important in watershed management and natural resources conservation planning studies and for the evaluation and implementation of water quality best management practices (BMPs) and the evaluation of TMDL's. Many water resources studies must now consider erosion related effects of watershed activities. Surface erosion models describe the detachment, deposition, and transport of soil particles by the erosive forces of raindrops, surface flow of water, and channel routing from the point of origin to the watershed outlet. The U. S. Army Corps of Engineers Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS) is a computer program designed to model watershed hydrology. Historically, HEC-HMS has focused on modeling rainfall-runoff processes; however, new tools have been added for sediment and water quality modeling. Output from these new tools could be used for making informed decisions about managing soil erosion within the watershed. An HEC-HMS model was developed for the Upper North Bosque River watershed (UNBRW), located in central Texas, where average daily flow and sediment loading were simulated. Results were evaluated by comparing measured flows and sediment loadings at locations within the basin. The HEC-HMS model was calibrated for the period of January 1995 through December 1996 and verified for the period of January 1997 through December 1998 with measured flow and sediment data. Results show that the HEC-HMS model provided reasonable predictions of average daily flow and sediment loadings during the calibration and validation periods at the sampling sites within the UNBRW.
Year: 2009