模拟降雨条件下苏南黄壤产流起始时间及影响因素研究

The factors affecting the starting time of slope runoff based on the rainfall simulation for the yellow soil in south Jiangsu

运用人工模拟降雨装置研究了暴雨条件下苏南典型丘陵土壤上纯草、纯灌、灌草3种经营模式下坡度、降雨强度、土壤前期含水量、植被覆盖度对开始产生径流时间的影响。研究表明:纯草模式下影响开始产流时间的最主要因子为土壤前期含水量,同时建立了3种植被组合下影响开始产流时间的多因子回归方程。通过方程,由植被覆盖度、坡度、土壤前期含水量和降雨强度四个易于获得的因子可预测不同植被组合下开始产生径流的时间。

In the typical hilly regions of south Jiangsu,under three different operating modes（pure grass,pure shrub,shrub and grass）,we used the artificial simulation of rainfall devices to study the influence of the gradient,rainfall intensity,antecedent soil water content and vegetation coverage on runoff starting time.It was found that the main impact-factor is antecedent soil water content under the pure grass model.Through equation,we can use these four easily available factors（gradient,rainfall intensity,antecedent soil water content and vegetation coverage）to predict the runoff starting time under different land use patterns.