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利用中子活化示踪法研究坡面土壤的侵蚀过程 ,发现坡面的相对侵蚀量从坡脚到坡顶随坡长的变化符合 Weibull分布 ,其形状参数主要受降雨量、降雨历时和径流深度的影响 ,尺度参数主要与平均雨强、I3 0 相关。坡面在侵蚀的同时也发生沉积 ,一般来说短历时高强度的降雨沉积量较小 ,而长历时低强度的降雨沉积量较大 ,某一部位侵蚀产沙的沉积量与其距离之间有 y=axb的关系。坡面径流直接影响着坡面的输移比 ,当径流深和径流系数较高时 ,输移比接近于 1,否则输移比降低
Using neutron activation tracing method to study the erosion process of slope soil, it was found that the change of relative erosion amount from slope foot to slope top with slope length accorded with Weibull distribution. The shape parameter was mainly affected by rainfall, rainfall duration and runoff depth Impact, scale parameters are mainly related to the average rainfall intensity, I3 0. Sediment also occurs on the slope at the same time as the erosion. Generally speaking, the precipitation of high intensity rainfall is shorter than that of the short duration, while the deposition of rainfall with long duration and low intensity is larger. There is y = axb relationship. Slope runoff directly affects the ratio of runoff and runoff. When the runoff depth and runoff coefficient are high, the transfer ratio is close to 1, otherwise the transfer ratio is reduced