Assessing the rate of soil loss and sediment Yeild from Tullu Gana Watershed in Horo Guduru Wollega Zone, Ethiopia

Q2 Environmental Science Environmental Challenges Pub Date : 2024-08-01 DOI:10.1016/j.envc.2024.100993
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Abstract

The two main issues facing Ethiopia's highlands are soil erosion and sedimentation. The purpose of this study was to evaluate the rate of soil loss and sediment yields in the Tullu Gana Watershed in the northwestern region of Ethiopia over the previous three decades (1990–2021). To create Rainfall Erosivity, Soil Erodibility, Slope Length and Steepness, Cover Management, and Conservation Practices, input data sets including rainfall, soil, Digital Elevation Model, land use, and land cover were utilized. Once more, the drainage area was used to determine the sediment delivery ratio. The RUSLE model and GIS were integrated in this study. The average soil loss rate was 1.01 tons ha−1 yr−1 in 1990, according to the results, but it increased to 43.80 tons ha−1 yr−1, 45.18 tons ha−1 yr−1, and 46.43 tons ha−1 yr−1 in 2000, 2010 and 2021, respectively. Between 1990, 2000, and 2010 to 2021, the average sediment yield in the study area increased from 0.19 tons ha−1yr−1, 8.41 tons ha−1yr−1, and 8.67 tons ha−1yr−1 to 20.61 tons ha−1yr−1, respectively. Over the past three decades, there has been an increase in agricultural land, plantations, and settlement, according to the results of changes in land cover. Grazing land, open forests, and shrub land, on the other hand, decreased during that time. In addition, the research area was divided into six sub-watersheds, with the aim of prioritizing them for conservation planning in the future, based on the average rate of soil loss. Among the six crucial sub watersheds, Sw2, Sw4, Sw5, and Sw6 were classified as having extremely high severity, while Sw1 was classified as having low severity. In general, determining erosion-prone areas and implementing sustainable land management depend on an understanding of the quantity of soil loss and sediment yield and the mapping of its distribution. These results are intended to assist decision-makers to prepare reliable plans for managing soil erosion while taking identified priority classes and hotspot areas into account.

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评估埃塞俄比亚 Horo Guduru Wollega 区 Tullu Gana 流域的土壤流失率和沉积物 Yeild
埃塞俄比亚高原地区面临的两大问题是土壤侵蚀和泥沙沉积。本研究的目的是评估埃塞俄比亚西北部地区图卢加纳流域过去三十年(1990-2021 年)的土壤流失率和泥沙产量。为了创建降雨侵蚀率、土壤可侵蚀性、坡长和坡度、覆盖管理和保护措施,利用了包括降雨、土壤、数字高程模型、土地利用和土地覆盖在内的输入数据集。此外,还利用排水面积来确定沉积物输送比。本研究将 RUSLE 模型和地理信息系统结合在一起。结果显示,1990 年的平均土壤流失率为 1.01 吨/公顷-年-1,而 2000 年、2010 年和 2021 年分别增加到 43.80 吨/公顷-年-1、45.18 吨/公顷-年-1 和 46.43 吨/公顷-年-1。1990 年、2000 年、2010 年至 2021 年期间,研究区域的平均泥沙产量分别从 0.19 吨/公顷-1 年-1、8.41 吨/公顷-1 年-1 和 8.67 吨/公顷-1 年-1 增加到 20.61 吨/公顷-1 年-1。根据土地覆被变化的结果,在过去 30 年中,农田、种植园和定居点有所增加。而放牧地、疏林和灌木林地则在此期间有所减少。此外,研究区域被划分为六个次级流域,目的是根据平均土壤流失率,确定这些流域在未来保护规划中的优先次序。在这六个重要的次级流域中,Sw2、Sw4、Sw5 和 Sw6 被划分为严重程度极高的流域,而 Sw1 被划分为严重程度较低的流域。总体而言,确定水土流失易发区和实施可持续土地管理取决于对土壤流失量和沉积物产量的了解及其分布图的绘制。这些结果旨在帮助决策者制定可靠的水土流失治理计划,同时考虑到已确定的优先等级和热点地区。
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来源期刊
Environmental Challenges
Environmental Challenges Environmental Science-Environmental Engineering
CiteScore
8.00
自引率
0.00%
发文量
249
审稿时长
8 weeks
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