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[目的]研究不同降雨强度和坡度对紫色土坡面产流过程的影响,为紫色土区域的水土流失防治提供科学依据。[方法]基于室内人工模拟降雨试验开展研究。[结果]不同雨强和坡度下的产流过程可大致分为“下凹”型和“上凸”型,且分别可以用指数函数和对数函数描述。随着雨强和坡度的增大,产流时间逐渐减小,产流过程逐渐趋于一致,坡面径流量逐渐增加。坡度和雨强对径流总量的贡献率有着对比消长的关系,小雨强下(雨强为33和54mm/h),坡度是坡面径流总量的主要贡献因子,随着雨强增大(雨强为94和125mm/h),雨强为坡面径流总量的主要贡献因子。[结论]坡度和雨强均为坡面侵蚀的主要影响因子,随着坡度和雨强的增加,坡面侵蚀更加剧烈,主要侵蚀因子也由坡度转变为雨强。
[Objective] The research aimed to study the effect of different rainfall intensity and slope on the runoff process of purple soil, and provide a scientific basis for soil erosion control in purple soil area. [Method] Based on indoor simulated rainfall test. [Result] The runoff process under different rainfall intensity and gradient can be divided into “concave” type and “convex” type, and they can be described by exponential function and logarithmic function respectively. With the increase of rainfall intensity and slope, the runoff time gradually decreased and the runoff process tended to be the same. The runoff of the slope increased gradually. The contribution of slope and rainfall intensity to the total runoff has a contrasting relationship with the increase and decrease of rainfall intensity (rainfall intensity of 33 and 54mm / h), and slope is the main contributor to the total runoff. As rainfall intensity increases Rain intensity of 94 and 125mm / h), rainfall intensity is the main contributor to total runoff. [Conclusion] Both slope and rainfall intensity were the main influencing factors of slope erosion. With the increase of gradient and rainfall intensity, slope erosion was more severe and the main erosion factor changed from slope to rainfall intensity.