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中文摘要：
目前降雨径流模拟采用佛汝德准则,模拟结果与实际相差较大。该文采用理论分析方法,通过对降雨径流过程中各作用力大小的比较,确定降雨径流试验相似准则。根据薄层均匀流流速分布,确定了流域侵蚀产沙悬移相似条件。确定出降雨过程中雨滴直径小于1.0mm,主导准则为雷诺相似准则,雨滴直径大于1.0mm,不存在相似准则。考虑正常雨滴直径变幅为0.1～3.5mm,降雨相似可由坡面径流相似主导准则韦伯相似准则确定,几何比尺宜大于10。根据试验资料,验证了相似准则的合理性和精度。该研究可为降雨及坡面径流模拟试验设计提供参考。
英文摘要：
At present, rainfall runoff simulations using Froude （Fr） criterion give rise to the large difference results between simulated and field situations. Using theoretic analytic method, similarity criterion in physical simulation of rainfall runoff was determined through comparing the magnitude of each applied force in the course of the rainfall runoff. Rationality and accuracy of the similarity criterion were validated with the experimental data. Suspended similar conditions were carried out depending on the flow velocity distribution of the thin layer of uniform flow. It was concluded that Re criterion was leading when the diameters of raindrops were less than 1.0 mm, otherwise there could be no similarity criterion. Rainfall similarity was determined by sheet flow similar leading criteria, which was the Weber （We） criteria and the scale of the geometric should be greater than 10, taking into account the variable amplitude of the normal raindrops diameters were 0.1-3.5 mm. The research can provide a reference for experimental design of rainfall and sheet flow simulation.
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