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进行了一系列室内试验,以验证模拟细沟演变动态过程的数学模型。该模型模拟了细沟水流的动态过程、水力学特性参数的空间变化、细沟中土壤的剥离、运输及沉积过程;模拟了细沟在侵蚀过程中的形态演变,其中包括沟宽、沟深、局部坡度在空间上的差异及其随时间的变化;模拟了细沟侵蚀/泥沙沉积后局部细沟形态的变化对细沟水流反馈效应。试验土壤为砂壤土,采用的坡度为:3%,5%,7%;3个流量:7.6,11.4,15.2L/min。在同一试验条件不同工况下对模型进行了验证,同时对细沟中沿程水流速度和细沟末端的侵蚀产沙量进行了模拟值和试验实测值的对比。结果表明,模型预测值和实测细沟形态演变值具有很好的一致性,模型中提出的侵蚀、沟床形态变化和水力学特性参数间的互反馈环效应可以反映细沟侵蚀的动态演变过程和发展趋势。
A series of laboratory tests were conducted to verify the mathematical model that simulates the dynamic evolution of the gutter. The model simulates the dynamic process of rill flow, the spatial variation of hydraulic parameters, the stripping, transport and deposition of soil in the rill, and simulates the morphological evolution of the rill in the erosion process, including the groove width, , The spatial variation of local slope and its change with time, and the feedback effect of the change of local thin-groove morphology on the rill flow was simulated after the erosion / deposition of sediment. The test soil is sandy loam with 3%, 5%, 7% slopes and 3 flows: 7.6, 11.4 and 15.2 L / min. The model was validated under different conditions of the same test conditions. Simultaneously, the simulative values and measured values of the sediment flow rate along the rill and the sediment yield at the end of the rill were compared. The results show that there is a good agreement between the predicted values of the model and the measured values of the shape of the gutter. The interaction between erosion, gutter shape and hydraulic parameters in the model can reflect the dynamic evolution of rill erosion And development trend.