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Soil erosion assessment of a Himalayan river basin using TRMM data

机译：利用TRMM数据对喜马拉雅河流域的水土流失评估。

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In this study, an attempt has been made to assess the soil erosion of a Himalayan river basin, the Karnali basin, Nepal, using rainfall erosivity (R-factor) derived from satellite-based rainfall estimates (TRMM-3B42 V7). Average annual sediment yield was estimated using the well-known Universal Soil Loss Equation (USLE). The eight-year annual average rainfall erosivity factor (R) for the Karnali River basin was found to be 2620.84 MJ mm ha~(-1) h~(-1) year~(-1). Using intensity-erosivity relationships and eight years of the TRMM daily rainfall dataset (1998-2005), average annual soil erosion was also estimated for Karnali River basin. The minimum and maximum values of the rainfall erosivity factor were 1108.7 and 4868.49 MJ mm ha~(-1) h~(-1) year~(-1), respectively, during the assessment period. The average annual soil loss of the Karnali River basin was found to be 38.17 t ha~(-1) year~(-1). Finally, the basin area was categorized according to the following scale of erosion severity classes: Slight (0 to 5 t ha~(-1) year~(-1)), Moderate (5 to 10 t ha~(-1) year~(-1)), High (10 to 20 t ha~(-1) year~(-1)), Very High (20 to 40 t ha~(-1) year~(-1)), Severe (40 to 80 t ha~(-1) year~(-1)) and Very Severe (＞80 t ha~(-1) year~(-1)). About 30.86% of the river basin area was found to be in the slight erosion class. The areas covered by the moderate, high, very high, severe and very severe erosion potential zones were 13.09%, 6.36%, 11.09%, 22.02% and 16.64% respectively. The study revealed that approximately 69% of the Karnali River basin needs immediate attention from a soil conservation point of view.
机译：在这项研究中，已尝试使用基于卫星降雨量估算（TRMM-3B42 V7）的降雨侵蚀力（R因子）来评估尼泊尔卡纳利盆地的喜马拉雅河流域的土壤侵蚀。使用众所周知的通用土壤流失方程（USLE）估算年平均沉积物产量。卡纳利河流域的八年年平均降雨侵蚀力因子（R）被发现为2620.84 MJ mm ha〜（-1）h〜（-1）年〜（-1）。利用强度-侵蚀力关系和TRMM日降雨数据集的八年时间（1998-2005年），还估算了卡纳利河流域的年均土壤侵蚀。在评估期间，降雨侵蚀力因子的最小值和最大值分别为1108.7和4868.49 MJ mm ha〜（-1）h〜（-1）年〜（-1）。卡纳利河流域的年平均土壤流失量为38.17 t ha〜（-1）年〜（-1）。最后，根据以下侵蚀严重程度等级对流域进行分类：轻度（0至5 t ha〜（-1）年〜（-1）），中度（5至10 t ha〜（-1）年）。 〜（-1）），高（10至20 t ha〜（-1）年〜（-1）），极高（20至40 t ha〜（-1）年〜（-1）），严重（ 40至80 t ha〜（-1）年〜（-1））和非常严重（> 80 t ha〜（-1）年〜（-1））。发现流域面积的30.86％属于轻微侵蚀等级。中度，高度，非常高，严重和非常严重的潜在侵蚀区覆盖的面积分别为13.09％，6.36％，11.09％，22.02％和16.64％。研究表明，从土壤保护的角度来看，卡纳利河流域约有69％需要立即引起注意。

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    ASHISH PANDEY; S.K. MISHRA; AMAR K GAUTAM; D. KUMAR;

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    Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee-247 667,Uttarakhand, India;

    Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee-247 667,Uttarakhand, India;

    Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee-247 667,Uttarakhand, India;

    Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee-247 667,Uttarakhand, India;

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