SENSITIVITY ANALYSIS OF A DRAINAGE SIMULATION MODEL1 |
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| Authors: | R S Kanwar H P Johnson |
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| Institution: | Respectively, Assistant Professor and Professor and Head, Dept. of Agricultural Engineering, 111 Davidson Hall, Iowa State University, Ames, Iowa 50011. |
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| Abstract: | A sensitivity analysis of a computer model, simulating major water and nitrogen processes of a soil-water-plant-climatic system on an annual basis, was conducted to determine how the model reacts to the variations in selected hydrologic and nitrogen parameters. Two major output variables (namely, total subsurface drain volume and cumulative nitrate loss with subsurface drain water) were selected for the sensitivity analysis. Model sensitivity analysis shows that the model is most sensitive to hydrologic parameters. The model is very sensitive to variations in the initial water content in the soil profile. |
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| Keywords: | drainage water quality models nitrate loss simulation |
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