HR: 16:24h
AN: H44B-03    [Abstracts]
TI: The Water, Energy, and Biogeochemical Model (WEBMOD): A TOPMODEL application developed within the Modular Modeling System
AU: * Webb, R M
EM: rmwebb@usgs.gov
AF: U.S. Geological Survey, Box 25046, MS 413 Denver Federal Center, Denver, CO 80225 United States
AU: Wolock, D M
EM: dwolock@usgs.gov
AF: U.S. Geological Survey, 4821 Quail Crest Place, Lawrence, KS 66049 United States
AU: Linard, J I
EM: jilinard@usgs.gov
AF: U.S. Geological Survey, Rm 406 Federal Bldg. 100 Centennial Mall North, Lincoln, NE 68508 United States
AU: Wieczorek, M E
EM: mewieczo@usgs.gov
AF: U.S. Geological Survey, 8987 Yellow Brick Rd., Baltimore, MD 21237 United States
AB: Process-based flow and transport simulation models can help increase understanding of how hydrologic flow paths affect biogeochemical mixing and reactions in watersheds. This presentation describes the Water, Energy, and Biogeochemical Model (WEBMOD), a new model designed to simulate water and chemical transport in both pristine and agricultural watersheds. WEBMOD simulates streamflow using TOPMODEL algorithms and also simulates irrigation, canopy interception, snowpack, and tile-drain flow; these are important processes for successful multi-year simulations of agricultural watersheds. In addition, the hydrologic components of the model are linked to the U.S. Geological Survey's (USGS) geochemical model PHREEQC such that solute chemistry for the hillslopes and streams also are computed. Model development, execution, and calibration take place within the USGS Modular Modeling System. WEBMOD is being validated at ten research watersheds. Five of these watersheds are nearly pristine and comprise the USGS Water, Energy, and Biogeochemical Budget (WEBB) Program field sites: Loch Vale, Colorado; Trout Lake, Wisconsin; Sleepers River, Vermont; Panola Mountain, Georgia; and the Luquillo Experimental Forest, Puerto Rico. The remaining five watersheds contain intensely cultivated fields being studied by USGS National Water Quality Assessment Program: Merced River, California; Granger Drain, Washington; Maple Creek, Nebraska; Sugar Creek, Indiana; and Morgan Creek, Delaware. Model calibration improved understanding of observed variations in soil moisture, solute concentrations, and stream discharge at the five WEBB watersheds and is now being set up to simulate the processes at the five agricultural watersheds that are now ending their first year of data collection.
DE: 1836 Hydrologic budget (1655)
DE: 1860 Runoff and streamflow
DE: 1871 Surface water quality
DE: 1886 Weathering (1625)
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting