Effects of Grass Cover on the Overland Soil Erosion Mechanism under Simulated Rainfall

Grass cover has a complex influence on overland soil erosion. This study quantified the impact of grass cover on overland soil erosion using a dimensionless water flow path index. It systematically analyzed the response mechanism among overland soil erosion, slope gradient, rainfall intensity, and hydrodynamic parameters, aiming to identify the optimal hydrodynamic parameters capable of characterizing overland soil erosion. A predictive model for soil erosion was constructed based on general dimensionless water flow intensity parameters, comprehensively evaluating the mechanism of soil erosion on grass-covered overland under simulated rainfall conditions. The results indicate that the model constructed using dimensionless parameters exhibits strong adaptability and can be effectively validated in other experiments.草本覆盖对坡面土壤侵蚀具有复杂影响。本研究采用无量纲水流路径指数，量化了草本覆盖对坡面土壤侵蚀的作用效果；系统分析了坡面土壤侵蚀、坡度、降雨强度与水力学参数间的响应机制，旨在筛选出可表征坡面土壤侵蚀的最优水力学参数。基于通用无量纲水流强度参数构建土壤侵蚀预测模型，全面解析模拟降雨条件下草本覆盖坡面的土壤侵蚀机制。研究结果表明，采用无量纲参数构建的模型适应性较强，可在其他试验中得到有效验证。