Scaling up watershed model parameters - flow and load simulations of the Edisto River basin

摘要: The Edisto River is the longest and largest river system completely contained in South Carolina one of free flowing blackwater rivers United States. basin also has fish-tissue mercury concentrations that are some highest recorded As part an effort by U.S. Geological Survey to expand understanding relations among hydrologic, geochemical, ecological processes affect fish- tissue within basin, analyses simulations hydrology were made with topography-based hydrological model (TOPMODEL). potential for scaling up a previous application TOPMODEL McTier Creek watershed, which small headwater catchment was assessed. Scaling done step-wise process beginning applying calibration parameters, meteorological data, topographic wetness index data from TOPMODEL. Additional changes subsequent culminating best simulation, included updated parameters parameters. Comparison goodness-of-fit statistics between measured simulated daily mean streamflow two models showed calibration, produced slightly better results than model, despite significant difference drainage-area size at outlet locations (30.7 2,725 square miles, respectively). Along hydrologic simulations, visualization tool (the Data Viewer) developed help assess trends influencing variables stream ecosystem. Incorporated into water-quality load TOPLOAD, TOPLOAD-H, LOADEST. Because focus this investigation on Creek, previously collected used models.