Improved SCS-CN model and its spatial scale effect analysis
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Abstract:
The Soil Conservation Service Curve Number (SCS-CN) method is a widely used empirical hydrologic model.Determination of its parameters and spatial scale effect of parameters have important influences on the accuracy of runoff simulations.With the upstream area of Huaihe River as the research area,we analyzed the sensitivity of SCS-CN model [JP]parameters and further modified the model.Spatial scale effects of parameters were analyzed based on the runoff simulation results at nine spatial resolutions (100 m~2 000 m).The results show that the sensibility of the basin water storage capacity parameter b was higher than that of the initial abstraction ratio (λ),which should be calibrated in the model.The spatial resolutions of underlying surface features had an important effect on the calibrated parameter b,which showed an exponential decreasing trend as the pixel scale increased.The optimal spatial resolution of the modified SCS model was 250500 m.