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Assessment of soil erosion hazard in Kilie catchment, East Shoa, Ethiopia

机译：埃塞俄比亚东绍阿基利流域的土壤侵蚀危害评估

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This paper reports on a field study conducted in Kilie catchment, East Shoa Zone, Ethiopia to assess the rate of soil erosion by employing a soil loss prediction model (Universal Soil Loss Equation) integrated with in remote sensing and geographical information systems (RS/GIS), environment and gully measurement techniques. The final soil erosion risk map was produced after multiplication of the six factors involved in the USLE and RS/GIS. Gully measurement showed that the erosion rate is higher for the upland areas than the lowlands due to inappropriate soil and water conservation measures, free grazing by animals and conversion of hillside areas into farmlands. About 97.04 per cent of the study catchment falls within a range of 010?t?ha-1?yr-1 sheet/rill erosion rate. We found that 2.17 per cent of the study area in the uplands has a soil erosion rate falling between 10 and 20?t?ha-1?yr-1. About 0.8 per cent of the study area in the uplands is hit by severe sheet/rill erosion rate within the range of 20-60?t?ha-1?yr-1. Gully erosion extent in the study area was evaluated through gully measurement and quantification methods. Gully density of 67?m?ha-1 was recorded in the catchment. The gully to plot area ratio was found to be 0.14 on average. Hence, in the upland areas, sustainable land management practices are required in order to reduce the rate of soil erosion. Copyright (C) 2011 John Wiley & Sons, Ltd.
机译：本文报告了一项在埃塞俄比亚东绍阿地区基利集水区进行的野外研究，以通过结合遥感和地理信息系统（RS / GIS）的土壤流失预测模型（通用土壤流失方程）来评估土壤侵蚀的速率），环境和沟壑测量技术。将USLE和RS / GIS中涉及的六个因素相乘后，便产生了最终的土壤侵蚀风险图。沟壑测量表明，由于水土保持措施不当，动物自由放牧以及山坡地区转化为农田，高地地区的侵蚀率高于低地地区。研究集水区的约97.04％落在010？t？ha-1？yr-1表层/钻头侵蚀率的范围内。我们发现，在高地的研究区域中，有2.17％的土壤侵蚀率介于10至20？t？ha-1？yr-1之间。在高地上，约有0.8％的研究区域受到严重的片层/小溪侵蚀率的影响，范围在20-60t？ha-1？yr-1之间。通过沟壑测量和量化方法评估研究区的沟壑侵蚀程度。流域记录的沟壑密度为67？m？ha-1。发现沟壑与地积的面积比平均为0.14。因此，在高地地区，需要可持续的土地管理做法，以减少水土流失的速度。版权所有（C）2011 John Wiley＆Sons，Ltd.

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