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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Modelling the process of soil detachment by rill flow on steep loessial hillslopes
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Modelling the process of soil detachment by rill flow on steep loessial hillslopes

机译：雨水流动对陡峭的丘陵山坡上的土壤脱离过程

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Soil detachment by rill flow is a key process of rill erosion, modelling this process can help in understanding rill erosion mechanisms. However, many soil detachment models are established on conceptual assumptions rather than experimental data. The objectives of this study were to establish a model of soil detachment by rill flow based on flume experimental data and to quantitatively verify the model. We simulated the process of soil detachment by rill flow in flume experiments with a soil-feeding hopper using loessial soil on steep slopes. Seven flow discharges, six slopes and five sediment loads were combined. Soil detachment capacity, sediment transport capacity, and soil detachment rate by rill flow under different sediment loads were measured. The process of soil detachment by rill flow can be modelled by a dual power function based on soil detachment capacity and transport capacity deficit as variables. The established model exhibited high credibility (NSE=0.97; R-2=0.97). The contributions of soil detachment capacity and transport capacity deficit to soil detachment rate by rill flow reached 60% and 36%, respectively. Soil detachment capacity exerted more influence on soil detachment rate than did transport capacity deficit. The performance of the WEPP rill erosion equation is also favourable (NSE=0.95; R-2=0.97). The two power exponents in the model we established strengthen the role of soil detachment capacity in soil detachment rate and weaken that for transport capacity deficit. Soil detachment capacity and transport capacity deficit played important roles in the determination of soil detachment rate by rill flow. The results can be applied to implement the numerical modeling and prediction of rill erosion processes on steep loessial hillslopes. (c) 2019 John Wiley & Sons, Ltd.
机译：土壤脱落流量是瑞尔腐蚀的关键过程，建模这个过程可以帮助了解瑞尔侵蚀机制。然而，许多土壤脱离模型是在概念假设而不是实验数据的情况下建立的。本研究的目标是基于水槽实验数据建立橄榄球流的土壤脱离模型，并定量验证模型。我们模拟了使用陡峭斜坡上的背部土壤饲养料斗的水滴流动的土壤脱落过程。组合七流量排放，六个斜率和五个沉积物。测量了不同沉积物荷载下罗尔流量的土壤分离能力，沉积物输送能力和土壤脱离率。通过基于土壤分离能力和作为变量的运输能力缺陷，可以通过双功率模拟土壤脱落过程。建立的模型表现出高可信度（NSE = 0.97; R-2 = 0.97）。土壤分离能力和运输能力赤字对土壤脱离率的贡献分别达到了60％和36％。土壤分离能力对土壤脱离率的影响力比运输能力赤字更多。 WEPP rill侵蚀方程的性能也有利（nse = 0.95; r-2 = 0.97）。模型中的两个动力指数我们建立了土壤分离能力在土壤脱离率中的作用，削弱运输能力缺陷。土壤分离能力和运输能力缺陷在瑞尔流动测定土壤脱离率时发挥了重要作用。结果可以应用于实施陡峭的背离山坡上的岩石侵蚀过程的数值建模和预测。 （c）2019 John Wiley＆Sons，Ltd。

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