HR: 0800h
AN: H51B-0353    [Abstracts]
TI: Use of an Instrumented Planar Experimental Plot to Provide Guidance for Physically-Based Hydrologic Modeling
AU: * Kampf, S K
EM: stephk@u.washington.edu
AF: University of Washington, Box 352700, Seattle, WA 98195
AU: Burges, S J
EM: sburges@u.washington.edu
AF: University of Washington, Box 352700, Seattle, WA 98195
AB: Physically-based hydrologic models represent the physical mechanisms that determine pathways of water through a watershed. Processes including surface overland flow, variably saturated subsurface flow, evapotranspiration, and channel flow are often studied individually rather then holistically; few existing data sets allow simultaneous assessment of how all of these hydrologic processes interact. This study examines whole-system hydrologic processes using a complete set of measurements collected at a 24 m² test plot in Seattle, Washington. The plot has a 5% grade and is grass-covered, containing 0.3m of till-based soil above an impermeable base. Measurements collected at the site include precipitation, surface runoff, subsurface flow, short and longwave radiation, net radiation, air temperature, humidity, wind speed, soil water contents, soil temperatures, and soil heat fluxes. Hydrologic processes in the plot are simulated using the physically-based numerical models, HYDRUS 2D for variably saturated flow and MODHMS for fully-coupled groundwater and surface water flow. Results demonstrate the relative benefits of different types of hydrologic measurements, provide guidance for determining `physically-based' model parameter values, and yield insights into the level of complexity required for accurate simulation of water pathways.
DE: 1849 Numerical approximations and analysis
DE: 1866 Soil moisture
DE: 1875 Vadose zone
DE: 1894 Instruments and techniques: modeling
DE: 1895 Instruments and techniques: monitoring
SC: Hydrology [H]
MN: Fall Meeting 2005