HR: 16:40h
AN: H44B-05    [Abstracts]
TI: Parameter Estimation of a Water Table Dynamics Model Used in Lands Surface Parameterization Scheme
AU: * Yeh, P J
EM: patyeh@hkucc.hku.hk
AB: A gridded version of the land-surface parameterization scheme (LSXGW) with a water table representation previously developed by the author was applied to the East River basin in sounth China. The scheme accounts for the sub-grid variability of water table depth and groundwatee rechage to investigate surface water-groundwater interaction. Four critical parameters were calibrated: 1. water table threshold depth, above which groundwater runoff will be triggered. 2. rate constant, which governs the rate of groundwater runoff generation. 3. specific yield, which controls the fluctuation of water table depth, 4. size of surface retention storage, which controls the partition of surface runoff and infiltration. Results indicate that daily and monthly streamflow at several locations of the basin can be simulated reasonably well by the model after calibration, and evaporation is only marginally affected by the four runoff parameters. The model performance for different combinations of 4 parameters are analyzed in order to understanding the relative control and mutual interaction of each parameter. A parameter estimation scheme based on the hydrograph separation designed for the poorly-gaged areas was developed and tested.
DE: 1829 Groundwater hydrology
DE: 1833 Hydroclimatology
DE: 1836 Hydrologic budget (1655)
DE: 1860 Runoff and streamflow
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2005 Joint Assembly