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在陕北黄土坡地枣园人工降雨产流产沙试验基础上,结合Philip入渗模型、坡面运动波模型和通用土壤流失方程,建立基于雨强、径流深、坡长、坡度和植被覆盖度等因素的次降雨产流产沙模拟模型,并通过人工降雨产流产沙试验验证模型。结果表明,径流量实测值与模拟值的NSC为0.87,平均误差为15%;产沙量实测值和模拟值的NSC为0.77,平均误差为26.2%。产流过程的模拟误差多在10%以下。坡面糙率随坡长的增大而呈减小趋势;随坡度的增大,单宽流量对坡度的响应敏感性逐渐减小。建立的次降雨产流产沙模型可以很好地模拟产流、产沙总量以及动态产流过程。
Based on the experiment of artificial rainfall runoff and sedimentation in the jujube orchard on the Loess Plateau in North Shaanxi Province, based on the Philip infiltration model, the moving wave model and the universal soil loss equation, the rainfall intensity, runoff depth, slope length, slope and vegetation coverage were established Factors of the sub-rainfall runoff and sediment production simulation model, and by artificial rainfall runoff experiment verification model. The results show that the NSC of measured and simulated runoff is 0.87 and the average error is 15%. The measured and simulated values of sediment yield show NSC of 0.77 and average error of 26.2%. The simulation error of the production process is more than 10%. The roughness of the slope decreases with the increase of the slope length. With the increase of slope, the response sensitivity of the single-wide flow to the slope decreases gradually. The established sub-rainfall runoff and sediment yield model can well simulate runoff, total sediment yield and dynamic runoff process.