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利用人工模拟降雨试验方法模拟原状土、邙山黄土、粉煤灰等不同土质坡面土壤降雨径流冲刷过程,对不同床沙下的坡面流水力学特性进行了研究。结果表明,不同床沙下坡面径流剪切力随降雨历时的变化规律是一致的,均表现出雨强越大,剪切力越大;在试验雨强范围内,邙山黄土、粉煤灰的剪切力较原状土为大;水流功率的变化规律与径流切应力的变化规律基本一致。该研究可为土壤侵蚀实体模型的建立提供理论基础。
Simulated rainfall-runoff scouring process was used to simulate the rainfall-runoff scouring process on plain soil, Huangshan loess, fly ash and other soil slopes, and the hydraulic characteristics of slopes under different bed sand were studied. The results show that the runoff shear forces of different runoff and runoff on the slope are consistent with the rainfall duration, showing that the greater the rainfall intensity, the larger the shear force. In the range of rainfall intensity, The shear force of ash is larger than that of undisturbed soil. The variation of water power and the variation of shear stress are basically the same. This study can provide a theoretical basis for the establishment of soil erosion entity model.