Modeling and Mapping of Soil Water Erosion Risks in the Srou Basin (Middle Atlas, Morocco) Using the EPM Model, GIS and Magnetic Susceptibility

Q3 Environmental Science Journal of Landscape Ecology(Czech Republic) Pub Date : 2022-05-01 DOI:10.2478/jlecol-2022-0007

Hassan Mosaid, A. Barakat, V. Bustillo, J. Rais

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引用次数: 8

Abstract

Abstract The Oued Srou watershed located in the Middle Atlas Mountain of Morocco has been a subject of serious soil erosion problems due to the combination of natural factors and anthropic activities. Therefore, soil erosion hazard assessment and mapping can be handy to initiate remedial measures in the area. In this study, the improved Erosion Potential Model (EPM) integrated with GIS and remote sensing techniques is employed to map and assess the vulnerability of the Oued Srou watershed to the water erosion phenomenon and its impact on the silting of the Ahmed El Hansali dam. The results of the EPM model showed that the maximum annual soil loss rates were in the range of 5-652 m3/km2/year, with an average of 49 m3/km2/year. The delivery coefficient ratio showed that about 34433 t/year of the sediments reach the outlet of the watershed. The correlation analysis between all erosion factors revealed the following order of their importance in the water erosion control: soil sensitivity to erosion, soil protection, slope, erosive state, temperature, and rainfall. The magnetic susceptibility provided results on the evolution of soils; it showed that the most degraded soils had a high erosion rate. Generally, the stable soils not eroded showed an upward increase of magnetic susceptibility values in soil profiles; the evolution of magnetic susceptibility of degraded soils is disturbed. The magnetic susceptibility has also made it possible to highlight the source zones of sediments that reach the outlet of the watershed.

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利用EPM模型、GIS和磁化率对Srou盆地（摩洛哥中部阿特拉斯）土壤水蚀风险进行建模和绘图

位于摩洛哥中部阿特拉斯山脉的Oued Srou流域，由于自然因素和人为活动的共同作用，土壤侵蚀问题十分严重。因此，土壤侵蚀危害评估和测绘可以方便地在该地区发起补救措施。本研究采用改进的侵蚀潜力模型(EPM)与GIS和遥感技术相结合，绘制和评估了Oued Srou流域对水侵蚀现象的脆弱性及其对Ahmed El Hansali大坝淤积的影响。EPM模型结果表明，年最大土壤流失率在5 ~ 652 m3/km2/年之间，平均为49 m3/km2/年。输沙系数比值表明，年输沙量约为34433 t/年。各侵蚀因子对水蚀控制的影响程度依次为:土壤敏感性、土壤保护、坡度、侵蚀状态、温度、降雨。磁化率提供了土壤演化的结果;结果表明，退化程度最高的土壤具有较高的侵蚀速率。总体而言，未被侵蚀的稳定土在剖面上磁化率值呈上升趋势;对退化土壤磁化率的演化进行了扰动。磁化率也使得能够突出到达流域出口的沉积物的源区。

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来源期刊

Journal of Landscape Ecology(Czech Republic) Environmental Science-Nature and Landscape Conservation

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： Journal of Landscape Ecology is a fully reviewed scientific journal published by Czech National Chapter of the Association for Landscape Ecology (CZ-IALE). Our international editorial board has ambition to fill up a gap in the ecological field scope covered by the European scientific journals and mainly those among them which are produced in the Czech Republic. Subjects of papers are not limited teritorially, however, emphasis is given to the Middle-European landscape-ecological themes. The journal is not preferentially theoretical or applied, it is prepared to serve as a bridge between both levels of knowledge. The effort will be developed to increase gradually its quality level and to reach for acceptation by databases of scientific journals with IF. The first issue of JLE was published in 2008. Recently, three issues of JLE are published per year.