ABSTRACT A comprehensive methodology that integrates the Universal Soil Loss Equation (USLE) and Geographic Information System (GIS) was adopted in this study to determine the soil erosion and sediment yield of the Irga watershed in Jharkhand, India. Based on the availability and applicability of data in a GIS-environment, the original equations for the model input parameters were, however, modified by researchers. In the present study, a power-law equation was generated to estimate the rainfall erosivity (R) factor, and the Nash-Sutcliffe model efficiency coefficient used to determine the accuracy of the modified R factor. Average annual soil erosion in the Irga watershed is estimated to be 4.3 t ha−1 yr−1. On the other hand, average annual sediment yield of the watershed, estimated using the sediment delivery ratio, was found to be 1.2 t ha−1 yr−1. Low sediment yield indicates that most of the eroded soil was deposited within the watershed.

中文翻译：

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应用 USLE 在 GIS 环境中估算印度贾坎德邦 Irga 流域的土壤侵蚀

摘要 本研究采用综合通用土壤流失方程 (USLE) 和地理信息系统 (GIS) 的综合方法来确定印度贾坎德邦 Irga 流域的土壤侵蚀和沉积物产量。然而，基于 GIS 环境中数据的可用性和适用性，研究人员修改了模型输入参数的原始方程。在本研究中，生成了一个幂律方程来估计降雨侵蚀力 (R) 因子，并使用 Nash-Sutcliffe 模型效率系数来确定修改后的 R 因子的准确性。Irga 流域的年平均土壤侵蚀量估计为 4.3 t ha-1 yr-1。另一方面，发现使用沉积物输送率估计的流域年平均沉积物产量为 1。2 吨 ha−1 yr−1。低产沙量表明大部分侵蚀土壤沉积在流域内。