Tuesday, November 6, 2007 - 2:20 PM
145-3

Subsurface Hydrology and Irrigated Agriculture in the San Joaquin Valley.

Jan Hopmans, 1 Shields Ave, University of California-Davis, Land Air Water Resources Dept, 123 Veihmeyer Hall, Davis, CA 95616 and Gerrit Schoups, Technical University Delft, Delft, Netherlands.

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 60 years. Recent analyses of climate change over California have provided projections of the range of warming and other changes in the region.  The hydrosalinity model was coupled with climate model projections of climate change through the 21st century, to evaluate the impact of climate change on irrigation water availability, crop water requirement, groundwater pumping, and soil salinity.

 


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