Spatial Variability of Infiltration Parameters at the Region Scales

Abstract:

Based on the infiltration experiments in Yangling district, the objective was to analyze the scaling process of Philip model. The spatial variation discipline of scaling factors was found out and the pedo-transfer function was established for estimating scaling factors. The study showed that the scaling of infiltration process based on αA was the best among different scaling factors in Yangling district. Therefore, the infiltration curves in the regional scale can be scaled with αA. Meanwhile, the reasonable sampling number was calculated under the different confidence levers and required precision. The spatial variation discipline of αA by ArcGIS software was analyzed, and the pedo-transfer function was established to estimate αA. Accuracy of the estimate αA was analyzed in terms of pedo-transfer function, the results suggested that it has feasible and reliable for estimating αA, which could be used to achieve the conversion of soil infiltration between point and region. 