HR: 1340h
AN: H13A-0392    [Abstracts]
TI: Calibration of a Heterogeneous Flow Simulation of the Western San Joaquin Valley
AU: * Zhang, H
EM: hhzhang@ucdavis.edu
AF: UC Davis, Dept. of Land,Air and Water Resources,UC Davis, Davis, ca 95616 United States
AU: Harter, T
EM: thharter@ucdavis.edu
AF: UC Davis, Dept. of Land,Air and Water Resources,UC Davis, Davis, ca 95616 United States
AB: A stochastic alluvial aquifer model was developed for the Westside of the San Joaquin Valley. Based on extensive analysis of well-logs, we determined sub-regional transition probability models of the major alluvial facies. The spatially varying geostatistical models were integrated into a non-stationary stochastic model of the aquifer structure using conditional sequential simulation. The hydraulic conductivities of the major facies are calibrated against a deterministic model representation of the regional fluxes across the land surface, of subflow across the eastern aquifer boundary, and of leakage across the bottom aquifer boundary. Weights for the individual calibration targets are assigned based on an approximation of the measurement errors underlying the calibration of the deterministic model, as well as potential modeling errors in the deterministic model. Our work addresses the overall issue of calibrating regional stochastic models to existing measurement data at relatively small scales as well as to derived data about the regional hydrologic water balance.
DE: 4255 Numerical modeling
DE: 1829 Groundwater hydrology
DE: 1869 Stochastic processes
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting