HR: 0830h
AN: H51C-1070    [PDF]
TI: Use of the Water, Energy, and Biogeochemical Model (WEBMOD) to Simulate Water Quality at Five U.S. Geological Survey Research Watersheds
AU: * Webb, R M
EM: rmwebb@usgs.gov
AF: USGS, Box 25046, Denver Federal Center, Denver, CO 80225-0046 United States
AU: Leavesley, G H
EM: george@usgs.gov
AF: USGS, Box 25046, Denver Federal Center, Denver, CO 80225-0046 United States
AU: Shanley, J B
EM: jshanley@usgs.gov
AF: USGS, P.O. Box 628, Montpelier, VT 05602 United States
AU: Peters, N E
EM: nepeters@usgs.gov
AF: USGS, 3039 Amwiler Toad, Atlanta, GA 30360-2824 United States
AU: Aulenbach, B T
EM: btaulenb@usgs.gov
AF: USGS, 3039 Amwiler Toad, Atlanta, GA 30360-2824 United States
AU: Blum, A E
EM: aeblum@usgs.gov
AF: USGS, 3215 Marine St. Suite E-127, Boulder, CO 80303 United States
AU: Campbell, D H
EM: dhcampbe@usgs.gov
AF: USGS, Box 25046, Denver Federal Center, Denver, CO 80225-0046 United States
AU: Clow, D W
EM: dwclow@usgs.gov
AF: USGS, Box 25046, Denver Federal Center, Denver, CO 80225-0046 United States
AU: Mast, M A
EM: mamast@usgs.gov
AF: USGS, Box 25046, Denver Federal Center, Denver, CO 80225-0046 United States
AU: Stallard, R F
EM: stallard@usgs.gov
AF: USGS, 3215 Marine St. Suite E-127, Boulder, CO 80303 United States
AU: Larsen, M C
EM: mclarsen@usgs.gov
AF: USGS, GSA Center 651 Federal Dr., Suite 400-15, Guaynabo, PR 00965 Puerto Rico
AU: Troester, J W
EM: jtroest@usgs.gov
AF: USGS, GSA Center 651 Federal Dr., Suite 400-15, Guaynabo, PR 00965 Puerto Rico
AU: Walker, J F
EM: jfwalker@usgs.gov
AF: USGS, 8505 Research Way, Middleton, WI 53562-3581 United States
AU: White, A F
EM: afwhite@usgs.gov
AF: USGS, Bldg. 15, McKelvey Building 345 Middlefield Rd., Menlo Park, CA 94025 United States
AB: The Water, Energy, and Biogeochemical Model (WEBMOD) was developed as an aid to compare and contrast basic hydrologic and biogeochemical processes active in the diverse hydroclimatic regions represented by the five U.S. Geological Survey (USGS) Water, Energy, and Biogeochemical Budget (WEBB) sites: Loch Vale, Colorado; Trout Lake, Wisconsin; Sleepers River, Vermont; Panola Mountain, Georgia; and Luquillo Experimental Forest, Puerto Rico. WEBMOD simulates solute concentrations for vegetation canopy, snow pack, impermeable ground, leaf litter, unsaturated and saturated soil zones, riparian zones and streams using selected process modules coupled within the USGS Modular Modeling System (MMS). Source codes for the MMS hydrologic modules include the USGS Precipitation Runoff Modeling System, the National Weather Service Hydro-17 snow model, and TOPMODEL. The hydrologic modules distribute precipitation and temperature to predict evapotranspiration, snow accumulation, snow melt, and streamflow. Streamflow generation mechanisms include infiltration excess, saturated overland flow, preferential lateral flow, and base flow. Input precipitation chemistry, and fluxes and residence times predicted by the hydrologic modules are input into the geochemical module where solute concentrations are computed for a series of discrete well-mixed reservoirs using calls to the geochemical engine PHREEQC. WEBMOD was used to better understand variations in water quality observed at the WEBB sites from October 1991 through September 1997. Initial calibrations were completed by fitting the simulated hydrographs with those measured at the watershed outlets. Model performance was then refined by comparing the predicted export of conservative chemical tracers such as chloride, with those measured at the watershed outlets. The model succeeded in duplicating the temporal variability of net exports of major ions from the watersheds.
DE: 1615 Biogeochemical processes (4805)
DE: 1655 Water cycles (1836)
DE: 1806 Chemistry of fresh water
DE: 1860 Runoff and streamflow
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: 2003 Fall Meeting