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首页> 外文期刊>Soil & Tillage Research >A new RUSLE slope length factor and its application to soil erosion assessment in a Loess Plateau watershed
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A new RUSLE slope length factor and its application to soil erosion assessment in a Loess Plateau watershed

机译：一种新的风格倾斜度因子及其在黄土高原流域土壤侵蚀评估的应用

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The Universal Soil Loss Equation and Revised Universal Soil Loss Equation have been widely used in watershed scale soil erosion assessments. However, the influences of the coupled effects of upslope topography and vegetation cover on flow accumulation and the downslope soil erosion are not fully considered in the current methods. In this study, a new calculating method for slope length factor (L), named the modified grid formula based on upslope contributing areas (L-M), was established by adding a new parameter, the effective contributing area ratio, to the existing L calculating method, the grid formula based on upslope contributing areas (L-G). A small watershed on the Loess Plateau was selected to evaluate the effects of the L-M on watershed soil erosion assessment. The soil erosion was estimated via the Revised Universal Soil Loss Equation using with two L calculating methods: L-M and L-G. Then, the soil loss of various land use types estimated from the two L methods were compared with the corresponding observed values from the nearby runoff plots, and the sediment yields based on the two L methods were estimated using the Sediment Delivery Distributed model and compared with measured values at the hydrologic station in the outlet of the watershed. The results indicated that, compared with L-G, 1) the L values obtained via the L-M were lower, contributing to a substantial decrease in soil erosion estimated at the watershed scale; 2) the average annual soil erosion estimated via the L-M for slope farmland, forestland and grassland in the watershed were closer to the observed values from local runoff plots; 3) the average annual sediment yield of the watershed estimated via the L-M was only +/- 5% relative to the measured values, implying that the values estimated via L-M was more accurate than the current methods. Overall, the L-M has accounted for the effect of vegetation hydrologic process and erosion process, which can improve the estimation accuracy of soil erosion assessments at the watershed scales and limit the risk of overestimating.
机译：通用土壤损失方程和修订的通用土壤损失方程已广泛应用于流域规模土壤侵蚀评估。然而，在目前的方法中没有完全考虑上升式地形和植被覆盖对流量积累和下坡土壤侵蚀的影响。在本研究中，通过添加新参数，有效贡献面积比率，建立了一种基于上升式贡献区域（LM）的改进的网格公式的斜率长度因子（L）的新计算方法。 ，基于Upslope贡献区域（LG）的网格配方。选择了黄土高原上的一个小流域，以评估L-M对流域土壤侵蚀评估的影响。通过经修订的通用土壤损耗方程估计土壤侵蚀，使用两种计算方法：L-M和L-G。然后，将来自两个L方法估计的各种土地使用类型的土壤丧失与来自附近的径流图的相应观察值进行比较，并且使用沉积物递送分布式模型估计基于两个L方法的沉积物产量并与流域出口中水文站的测量值。结果表明，与L-G，1）通过L-M获得的L值较低，促进流域估计的土壤侵蚀的显着降低; 2）通过L-M估计的平均年度土壤侵蚀，用于分水岭中的坡地，林地和草原较近局部径流地块的观察价值; 3）通过L-M估计的流域的平均年龄沉积物产量相对于测量值仅+/- 5％，这意味着通过L-M估计的值比当前方法更准确。总体而言，L-M已经占植被水文过程和侵蚀过程的影响，这可以提高流域尺度的土壤侵蚀评估的估计准确性，并限制过高估计的风险。

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