Screen covering is a widely used soil conservation practice to control water erosion in coarse-textured soil areas. A better understanding of the effects of screen covers at reducing rainfall kinetic energy (KE) on the erosion behavior will improve erosion prediction and control measures development. The objective of this study was to investigate and quantify the effects of rainfall KE on the soil loss and sediment sorting for developing a prediction model in a coarse-textured soil. A series of rainfall simulation experiments were conducted in three horizons of a coarse-textured soil under five rainfall KEs (628, 443, 324, 231, and 110 J m⁻² h^-1) which were obtained by covering the soil surface with wire screens of different apertures at a coincident intensity of 90 mm h^-1. The results showed that the increase in rainfall KE increased runoff rate and soil erosion rate. The soil erosion rate also increased with depth of the soil layer exposed to the soil surface. Based on the soil clay content, a power relationship could describe the relationships between soil erosion rate and geometric mean diameter of sediment and stream power. With increasing rainfall KE and runoff duration, although the percentage of clay- and silt-sized particles in the sediment decreased, both were still higher than the content in the original soil. The enrichment of fine particles in runoff produced a coarsening layer on the slope surface, which might restrain the subsequent erosion in situ. The observed large preferential loss of clay- and silt-sized particles by erosion emphasizes the importance of sediment sorting for subsequent erosion in these coarse-textured soils. These results suggest that the relationship of rainfall KE to erosion should be considered for practical and effective estimation and prediction of the potential erosiveness of rainstorms.

筛网覆盖是一种广泛使用的水土保持措施，可以控制粗糙结构土壤区域的水蚀。更好地了解屏幕覆盖物在减少降雨动能（KE）对侵蚀行为的影响方面将改善侵蚀预测和控制措施的制定。这项研究的目的是调查和量化降雨KE对土壤流失和沉积物分选的影响，以建立粗糙结构土壤的预测模型。在五层降雨KEs（628、443、324、231和110 J m ^-2 h ^-1）下，用粗糙的质感土壤在三个水平线上进行了一系列降雨模拟实验，这些降雨是通过用线覆盖土壤表面获得的在90 mm h的同时强度下不同孔径的光幕^-1。结果表明，降水量的增加增加了径流率和水土流失率。土壤侵蚀速率也随着暴露于土壤表面的土壤层深度的增加而增加。基于土壤黏土含量，幂关系可以描述土壤侵蚀速率与沉积物几何平均直径和流功率之间的关系。随着降雨KE和径流持续时间的增加，尽管沉积物中粘土和淤泥大小的颗粒的百分比降低了，但两者仍然都高于原始土壤中的含量。径流中细颗粒的富集在斜坡表面产生了一个粗化层，这可能会限制随后的原地侵蚀。观测到的由于侵蚀而使粘土和粉粒大小的颗粒大量优先损失，强调了在这些粗糙结构的土壤中进行后续侵蚀的沉积物分类的重要性。这些结果表明，应考虑降雨KE与侵蚀的关系，以便对暴雨的潜在侵蚀性进行切实有效的估计和预测。