Infiltration and runoff predictions for a grassland watershed |
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| Authors: | RJ Luxmoore |
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| Institution: | Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830 U.S.A. |
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| Abstract: | Field-determined infiltration characteristics used as input to an infiltration equation combined with adjusted parameters in a variable contributing area (VCA) algorithm of a hydrologic model were used to provide agreement between the annual simulated runoff and measurements from the grassland watershed site. Any discrepancy in Hortonian runoff from the infiltration calculations was compensated for by VCA runoff in the hydrologic simulation. Evaluation of the VCA parameterization suggested that contributions of VCA runoff to total streamflow were unreasonably high and that the infiltration parameters overpredicted annual infiltration. It is recommended that field measurements of infiltration characteristics for hydrologic studies be obtained during the season with predominant Hortonian runoff. |
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