Study on a comparison of runoff erosion power and rainfall erosivity for single rainstorm event under different spatial scales | 不同空间尺度次暴雨径流侵蚀功率与降雨侵蚀力的对比研究

Chinese. 提出径流侵蚀功率的概念，对比分析降雨侵蚀力和径流侵蚀功率在表征次暴雨水力侵蚀动力上的优劣。基于次暴雨洪水过程中径流深和洪峰流量模数2个重要的水文特征参数，提出了径流侵蚀功率的概念，并利用岔巴沟流域团山沟径流场和纸坊沟流域2个不同空间尺度实测降雨径流泥沙资料，对径流侵蚀功率和降雨侵蚀力表征次暴雨水力侵蚀动力的优劣进行了比较。径流侵蚀功率可以更好地表征坡面和流域尺度的次暴雨水力侵蚀动力，更能体现天然降雨和下垫面特性对次暴雨侵蚀产沙的综合影响。与通用的降雨侵蚀力相比，径流侵蚀功率更适宜用作坡面、流域尺度次暴雨侵蚀产沙模型的侵蚀动力因子。

English. The concept of runoff erosion power under single rainstorm event was proposed in the paper, and a comparison of runoff erosion power and rainfall erosivity was conducted. Based on two characteristic values of flood hydrograph under single rainstorm events, i.e. peak discharge modulus and runoff depth, the concept of runoff erosion power under single rainstorm event was proposed in the paper. According to the historically observed data of runoff and sediment under single rainstorm events from Tuanshangou No.3 runoff plot and Zhifanggou watershed, a comparison of runoff erosion power and rainfall erosivity for determining which could more effectively describe the erosion dynamics of water erosion under single rainfall events was carefully made. The results showed that runoff erosion power could precipitate the integrated effect of rainfall, runoff and underlying surface on hillslope or watershed soil erosion and sediment yield under single rainstorm events. Compared with rainfall erosivity, the proposed runoff erosion power in the paper was more suitable for being the erosion dynamic factor of hillslope and watershed soil erosion models under single rainstorm events.