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Laboratory Experiment and Theoretical Analysis of Dynamic Parameters for Water Erosion Prediction Model

机译：水腐蚀预测模型动态参数的实验室实验与理论分析

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Water erosion is a complicated physical process. The prediction model is a powerful tool to research the mechanism of water erosion and more and more attention has been paid to the physical- process-based soil erosion prediction model. The parameters used in the erosion prediction model should have a specific physical meaning and could be expressed by a mechanical function or measured by experiment, which is the key points for the sound application of soil erosion prediction model. A series of integrated experiments were designed to obtain the parameters used in the water erosion prediction model under the different hydraulic conditions (different slopes and in-flow rates). Considering the fact that, under steady flow, sediment concentration increases with slope length and will finally approach that corresponding to the sediment transport capacity, a laboratory flume experimental method with variable slope length is advanced for transport capacity determination. And a mathematical expression is suggested to estimate the transport capacity with thus obtained experimental data. A series of 405 flume experiments were conducted with sand-clay (loess) soil. Transport capacity is related to slope gradient and inflow rate. Based on the experiments thus made, a method was advanced to compute the detachment rate of sediment loading water flow, under the assumption that the flow and soil are behaving the same way along rills. Then detachment rates were presented as functions of sediment concentration and rill length.
机译：水腐蚀是一种复杂的物理过程。预测模型是研究水侵蚀机制的强大工具，越来越多地关注基于物理过程的土壤侵蚀预测模型。侵蚀预测模型中使用的参数应该具有特定的物理含义，并且可以通过机械函数表示或通过实验测量，这是土壤侵蚀预测模型的声音应用的关键点。设计了一系列集成实验，以获得在不同的液压条件下的水侵蚀预测模型中使用的参数（不同的斜坡和流量速率）。考虑到，在稳定流动下，沉积物浓度随着斜坡长度的增加而增加，最终对应于沉积物输送能力的接近，具有可变斜坡长度的实验室水槽实验方法，用于运输能力测定。建议估计由此获得的实验数据估计运输能力的数学表达。通过砂粘土（黄土）土壤进行了一系列405个水槽实验。运输能力与坡度梯度和流入率有关。基于如此制造的实验，在假设流动和土壤沿植物的情况下表现相同的方式，基于如此制造的方法来计算沉积物负荷沉积物的分离率。然后拆卸率被呈现为沉积物浓度和雨螺长度的函数。

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