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当雨滴击溅力和地表径流冲刷力超过土壤颗粒的内聚力时,便会发生降雨侵蚀。基于这个基本观点,本文通过一种理论的方法对降雨侵蚀过程进行了描述。击溅力和冲刷力可通过雨滴和径流产生的动量通量求得。为计算土壤可蚀性,引入一个临界动量通量,它取决于前期侵蚀量。该模型与实验数据进行了校验,校验后的模型经计算机运行后,其结果与野外实测结果较为吻合。
Rainfall erosion occurs when raindrop splashing and surface runoff exceed the cohesion of soil particles. Based on this basic point of view, this paper describes the process of rainfall erosion through a theoretical approach. Splash force and flushing force can be obtained by the momentum and momentum generated by raindrops and runoff. To calculate soil erodibility, a critical momentum flux is introduced that depends on the amount of pre-erosion. The model is verified with the experimental data. After the model is verified by the computer, the results are in good agreement with the field measurements.