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SENSITIVITY OF THE REGIONAL WATER BALANCE IN THE COLUMBIA RIVER BASIN TO CLIMATE VARIABILITY: APPLICATION OF A SPATIALLY DISTRIBUTED WATER BALANCE MODEL
Citation:
Dolph, J., D. Marks, AND G. King. SENSITIVITY OF THE REGIONAL WATER BALANCE IN THE COLUMBIA RIVER BASIN TO CLIMATE VARIABILITY: APPLICATION OF A SPATIALLY DISTRIBUTED WATER BALANCE MODEL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-91/184 (NTIS PB91226522), 1991.
Description:
A one-dimensional water balance model was developed and used to simulate water balance for the Columbia River Basin. he model was run over a 10 km X 10 km grid for the United State's portion of the basin. he regional water balance was calculated using a monthly time-step for a relatively wet year, a relatively dry year, and for a double CO2 climate scenario. nput data, spatially distributed over the grid, included precipitation, maximum soil storage retention capacity, potential evapotranspiration (ET), runoff and soil storage. odel performance was assessed by comparing modeled ET and runoff with the input precipitation data, and by comparing modeled runoff with measured runoff. he model reasonably partitions incoming precipitation to evapotranspiration and runoff. owever, modeled total annual runoff was significantly less than measured runoff, primarily because precipitation is underestimated by the network of measurement stations and because of limitations associated with the interpolation procedure used to distribute the precipitation across the grid.
