HR: 08:30h
AN: H11G-03 INVITED     [Abstracts]
TI: Extension of a flux estimation methodology based on soil moisture conditional averaging to groundwater systems with application to estimation, model specification, and scaling of groundwater-surface water interactions
AU: * Salvucci, G D
EM: gdsalvuc@bu.edu
AF: Boston University, Dept. of Earth Sciences 685 Commonwealth Ave., Boston, MA 02215 United States
AB: Salvucci [2001, WRR] presented a methodology for estimating the moisture dependence of root zone water loss (drainage plus evapotranspiration) based on conditionally averaging the water balance equation according to soil moisture state (S). In that work, it was shown that the conditional average of the transient storage term, E[ dS/dt | S], vanishes for stationary systems, leaving a balance of conditionally averaged precipitation, E[P | S], and conditionally averaged water loss terms. The methodology has been used to estimate both the point and area-scaled dependence of water loss terms on moisture from more readily available measurements of precipitation and moisture. Here we extend this method to groundwater systems by conditional averaging the Dupuit equation according to water table depth. In this case, we show that the dependence of recharge (net of percolation and capillary rise) on water table depth can be inferred from conditional averaging of the divergence of water table heights. Applications of this approach to problems of estimation, model specification, and scale-dependence will be presented.
DE: 1829 Groundwater hydrology
DE: 1830 Groundwater/surface water interaction
DE: 1846 Model calibration (3333)
DE: 1847 Modeling
SC: Hydrology [H]
MN: Fall Meeting 2005