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首页> 外文期刊>Journal of Civil, Construction and Environmental Engineering >Soil Erosion Risk Assessment in Nashe Dam Reservoir Using Remote Sensing, GIS and RUSLE Model Techniques in Horro Guduru Wollega Zone, Oromia Region, Ethiopia
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Soil Erosion Risk Assessment in Nashe Dam Reservoir Using Remote Sensing, GIS and RUSLE Model Techniques in Horro Guduru Wollega Zone, Oromia Region, Ethiopia

机译：利用遥感，GIS和RUSLE模型技术对埃塞俄比亚奥罗米亚地区Horro Guduru Wollega地区的纳西水库水土流失风险进行评估

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Soil degradation is wide spread and serious throughout the Ethiopian Highlands. It is also a major watershed problem in many developing countries causing significant loss of soil fertility, loss of productivity and environmental degradation. This research has, therefore, been carried out to evaluate the soil erosion risk and quantify the major land use land cover changes over the past 20 years (1996-2016) in the Nashe watershed. The research integrates the Revised Universal Soil Loss Equation (RUSLE) with a Geographic Information System (GIS) and Remote Sensing (RS) to quantify the potential soil erosion risk and land use land cover changes. Rainfall data, soil data, DEM data and satellite image were used as input data sets to generate RUSLE factor values. Raster calculator was used to interactively calculate potential soil loss and prepare soil erosion risk map. For the land use land cover change calculation two satellite images of two year interval ( Landsat TM 1996 and Landsat 2016) has been utilized. As a result the potential soil erosion risk and land use land cover map of 1996 and 2016 of the study area was generated. The result showed that the potential annual soil loss of the watershed ranges from 0.00 to 243..065ton/ha/yr. and the mean annual soil loss rate is 45.7ton/ha/yr. Concerning the land use land cover change Grass land decline from (8.85%) to (6.85.4%), open forest changes from (47.10%) to (22.75 %) and settlement land changes from (4.42%) to (7.59%). On the contrary farm land changes from (27.18%) to (45.55%), bare lands increase from (5.40%) to (5.55%) and water body changes from (7.06%) to (12.10 %). By the LULC analysis it has been found that the grass land and forest land declined from 1996-2016. On other hand, the rest of the land cover types have increased.
机译：整个埃塞俄比亚高地的土壤退化情况广泛且严重。在许多发展中国家，这也是一个重要的分水岭问题，导致土壤肥力严重丧失，生产力丧失和环境恶化。因此，本研究旨在评估纳西河流域过去20年（1996-2016年）的水土流失风险并量化主要土地利用的土地覆被变化。该研究将修订的通用土壤流失方程（RUSLE）与地理信息系统（GIS）和遥感（RS）集成在一起，以量化潜在的土壤侵蚀风险和土地利用土地覆盖变化。降雨数据，土壤数据，DEM数据和卫星图像被用作输入数据集，以生成RUSLE因子值。栅格计算器用于交互式计算潜在的土壤流失并准备土壤侵蚀风险图。为了进行土地使用，土地覆盖变化计算使用了两个间隔为两年的卫星图像（Landsat TM 1996和Landsat 2016）。结果，生成了研究区域1996年和2016年潜在的水土流失风险和土地利用土地覆盖图。结果表明，该流域的潜在年土壤流失量为0.00至243..065吨/公顷/年。年平均土壤流失率为45.7吨/公顷/年。关于土地利用土地覆盖的变化草地的土地面积从（8.85％）减少到（6.85.4％），开阔的森林面积从（47.10％）改变为（22.75％），定居地的面积从（4.42％）改变为（7.59％） 。相反，耕地从（27.18％）变为（45.55％），光秃秃的土地从（5.40％）增长到（5.55％），水体从（7.06％）增长到（12.10％）。通过LULC分析发现，从1996年至2016年，草地和林地减少了。另一方面，其余的土地覆盖类型有所增加。

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