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降雨侵蚀是降雨和土壤的相互作用。降雨的作用称为侵蚀力,土壤的作用称为可蚀性。具体地讲,降雨侵蚀力是指降雨引起侵蚀的潜在能力,土壤可蚀性是指土壤对侵蚀的易损性或敏感性,在通用土壤流失方程式中二者分别用R和K麦示。对于降雨侵蚀力R的研究,国外开展较早。美国学者威斯其迈尔(Wischmier)找出了降雨的动能与其30分钟最大强度的乘积是判断土壤流失的最好指标,其表达式为R=∑EI_(30)。这个计算式是用美国的资料
Rainfall erosion is the interaction between rainfall and soil. The role of rainfall is called erosivity, and the role of soil is called erodibility. Specifically, rainfall erosivity refers to the potential for rainfall-induced erosion. Soil erosivity refers to the vulnerability or susceptibility of soils to erosion. In general-purpose soil loss equations, both are denoted R and K, respectively. For the study of rainfall erosive force R, carried out earlier abroad. Wischmier, the American scholar, finds out that the product of the kinetic energy of rainfall and its maximum intensity of 30 minutes is the best indicator of soil erosion, and its expression is R = ΣEI_ (30). This formula is based on the U.S. data