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首页> 外文期刊>Engineering Geology >Suitability of transport equations in modelling soil erosion for a small Loess Plateau catchment
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Suitability of transport equations in modelling soil erosion for a small Loess Plateau catchment

机译：黄土高原小流域土壤侵蚀模型中迁移方程的适用性

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Erosion models have not often been applied to very steep terrain such as the gully catchments of the Chinese Loess Plateau. The purpose of this research was to evaluate the suitability of a number of transport equations for use in erosion modelling under Loess Plateau conditions. To do this the equations were programmed into the LISEM model, which was applied to the 3.5 km~2 Danangou catchment in the rolling hills region of the Loess Plateau. Previous evaluations of transport equations used either flume tests or river sections, and did no spatial modelling. The results show that some equations predicted physically impossible concentrations (defined as above 1060 g/l). The results were evaluated by using two methods: 1) by comparing predicted and measured sedigraphs and sediment yield at the catchment outlet, and 2) by comparing the fraction of the catchment in which physically impossible transport capacities occurred. The results indicated that for the small grain sizes, high density flows and steep slopes of the gully catchments on the Loess Plateau the Shields parameter attained very high values. Furthermore, the transport threshold can usually be neglected in the equations. Most of the resulting equations were too sensitive to slope angle (Abrahams, Schoklitsch, Yalin, Bagnold, Low and Rickenmann), so that transport rates were overpredicted for steep slopes and underpredicted for gentle slopes. The Yang equation appeared to be too sensitive to grainsize. The Govers equation performed best, mainly because of its low slope dependency, and is therefore recommended for erosion models that simulate sediment transport by flowing water in conditions with, small grain sizes and steep slopes.
机译：侵蚀模型并不经常应用于非常陡峭的地形，例如中国黄土高原的沟壑集水区。这项研究的目的是评估在黄土高原条件下用于侵蚀模型的许多运输方程的适用性。为此，将方程编程到LISEM模型中，该模型应用于黄土高原起伏丘陵地区的3.5 km〜2 Danangou流域。先前对运输方程的评估使用水槽测试或河段，并且没有进行空间建模。结果表明，一些方程式预测了物理上不可能的浓度（定义为1060 g / l以上）。通过两种方法对结果进行评估：1）通过比较集水区出口的预测和测量的沉积物和沉积物产量，以及2）比较存在物理上不可能的运输能力的集水区的分数。结果表明，对于小粒径，高密度流和黄土高原沟壑集水区的陡坡，Shields参数获得了很高的值。此外，通常在等式中可以忽略运输阈值。大多数结果方程对斜坡角度太敏感（亚伯拉罕，肖克利奇，亚林，巴格诺德，洛特和里肯曼），因此对于陡坡，运输速率被高估，对于平缓斜坡，运输速率被低估。杨方程似乎对晶粒尺寸太敏感。 Govers方程的表现最佳，主要是因为其对坡度的依赖性较低，因此建议将其用于侵蚀模型，该模型通过在小粒径和陡坡的条件下通过流水来模拟沉积物的输送。

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