HR: 0830h
AN: H21B-07    [Abstracts]
TI: Integrated Modeling of Regional-Scale Flow and Reactive Salt Transport in the Western San Joaquin Valley
AU: * Hopmans, J W
EM: jwhopmans@ucdavis.edu
AF: University of California, Dept lAWR , Davis, CA 95616 United States
AU: Schoups, G
EM: gerrit@stanford.edu
AF: Stanford University, Dept. of Geological and Environmental Sciences, Stanford, CA 94305 United States
AU: Tanji, K
EM: kktanji@ucdavis.edu
AF: University of California, Dept lAWR , Davis, CA 95616 United States
AU: Wallender, W W
EM: wwwallender@ucdavis.edu
AF: University of California, Dept lAWR , Davis, CA 95616 United States
AB: An integrated model of regional-scale subsurface flow and reactive salt transport and its application to the western San Joaquin Valley study area is presented. The integrated model uses the MOD-HMS model to simulate three-dimensional subsurface flow and transport, and couples it to the major ion chemistry modules of the UNSATCHEM model. Unique features of the integrated model include the full coupling of the vadose zone and groundwater systems, and the accounting for major ion chemistry effects on soil and groundwater salinization. The model was applied to the western San Joaquin Valley study area to simulate changes in regional-scale soil and groundwater salinization that occurred over the last 50 years. Model simulation results were compared to historical observations of water table depths, groundwater pumping, subsurface drainage, and soil and groundwater salinity. Based on the general correspondence between observed and simulated relationships it was concluded that these processes are adequately represented in the model.
DE: 1842 Irrigation
DE: 1866 Soil moisture
DE: 1875 Unsaturated zone
DE: 1894 Instruments and techniques
SC: Hydrology [H]
MN: 2005 Joint Assembly