径流侵蚀功率理论在不同尺度坡面侵蚀产沙中的应用

Application of Runoff Erosion Power in the Calculation of Soil Erosion and Sediment Yield on Hillslopes

基于次暴雨洪水过程中径流深、洪峰流量模数2个的重要水文特征参数,提出了用以描述坡面次暴雨水蚀动力的径流侵蚀功率的概念,并以岔巴沟流域团山沟不同空间尺度径流场历年实测次暴雨径流泥沙资料为基础,分析了径流侵蚀功率与坡面径流场次暴雨侵蚀模数之间的相关性,提出了适用于坡面次暴雨侵蚀产沙计算的基于径流侵蚀功率的坡面次暴雨水沙响应关系。研究结果表明:径流侵蚀功率与坡面次暴雨侵蚀模数之间存在极显著的幂函数相关关系,径流侵蚀功率可以较好地表征坡面次暴雨水力侵蚀动力。本研究成果可为黄土高原坡面次暴雨侵蚀产沙模型侵蚀动力因子的确定提供参考。

Based on two important hydrologic characteristic factors as runoff depth and peak discharge modulus in the process of single rainstorm events, the paper put forward the concept of runoff erosion power which could effectively describe the dynamics erosion on hillslope. According to the historically observed data of runoff and sediment under single rainstorm events from Tuanshangou runoff plots with different spatial scales, the correlation of runoff erosion power and sediment transport modulus on runoff plots was systematically analyzed. The results showed that runoff erosion power has an extremely significant exponential relation with erosion modulus of single rainstorm events on hitlslope. The runoff erosion power can be a better token of the storm erosion power. The results can provide a certain reference for determination of erosion dynamic factor on slope in loess plateau.