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首页> 外文会议>International Soil Conservation Organization Conference vol.4; 20020526-31; Beijing(CN) >Laboratory Experiment and Theoretical Analysis of Dynamic Parameters for Water Erosion Prediction Model
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Laboratory Experiment and Theoretical Analysis of Dynamic Parameters for Water Erosion Prediction Model

机译：水蚀预报模型动态参数的室内实验与理论分析

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摘要

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：水蚀是一个复杂的物理过程。该预测模型是研究水蚀机理的有力工具，人们越来越重视基于物理过程的水土流失预测模型。侵蚀预测模型中使用的参数应具有特定的物理意义，并可以通过机械功能表达或通过实验测量，这是合理应用土壤侵蚀预测模型的关键。设计了一系列综合实验，以获取在不同水力条件（不同的坡度和流入速率）下水蚀预测模型中使用的参数。考虑到在稳定水流下，泥沙浓度随边坡长度的增加而增加，并最终接近对应于泥沙输送能力的事实，因此提出了一种采用可变边坡长度的实验室水槽实验方法来确定泥沙的输送能力。并提出了数学表达式来估计由此获得的实验数据的运输能力。在沙土（黄土）土壤上进行了405次水槽实验。运输能力与坡度和入流率有关。在进行的实验的基础上，提出了一种方法，在假设水流和土壤沿小溪的流动方式相同的情况下，计算出泥沙负荷水流的分离速率。然后提出了脱离速率与沉积物浓度和小溪长度的关系。

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