Assessment of soil erosion risk severity using GIS, remote sensing and RUSLE model in Oued Laou Basin (north Morocco)

IF 1.4 Q4 SOIL SCIENCE

Soil Science Annual Pub Date : 2021-12-31 DOI:10.37501/soilsa/142530

Omayma Amellah, Karim el Morabiti

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引用次数: 13

Abstract

Soil loss by lateral fl ow is a critical bother in the Oued Laou basin due to the steepness of its landscape relief and the considerable deference altitudinal between the upstream and downstream area. Those predispositions highly increase soil vulnerability to the risk of erosion indeed; tones of sediment are transported each year, causing signifi cant damages regarding structures and waterworks such as siltation. For this reason, this work focus on the merging of remote sensing techniques, GIS, and the Revised Universal Soil Loss (RUSLE) Equation to quantitatively evaluate soil erosion severity as well as highlight the most erosion-prone areas in the Oued Laou basin, Northwestern Morocco. Accordingly, the study site area was arranged into six soil erosion risk categories: very slight (25.3%), slight (12.4%), moderate (40.5 %), intense (12.2%), very intense, (5%) and severe (4.6%). Moderate to severe soil loss rates that are correlated to abrupt slopes defi ned most of the basin area. In addition to the spatial distribution of soil severity classes over the study area, the average annual soil erosion rate was estimated to be 31.5 t ha–1 year–1 in the Oued Laou watershed. The latter amount was compared to many previous studies that have been carried out in the surrounding basins based on RUSLE or other techniques to validate the model accuracy. Keywords

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基于GIS、遥感和RUSLE模型的摩洛哥北部Oued Laou盆地土壤侵蚀风险严重程度评估

由于乌老盆地地势陡峭，且上下游高度差异较大，侧向流造成的水土流失是该流域的一个严重问题。这些倾向确实极大地增加了土壤对侵蚀风险的脆弱性;每年都有大量的泥沙被运输，对建筑物和水利设施造成严重的破坏，如淤积。因此，这项工作的重点是将遥感技术、地理信息系统和修订的通用土壤流失量(RUSLE)方程结合起来，定量评估土壤侵蚀严重程度，并突出摩洛哥西北部Oued Laou盆地最容易发生侵蚀的地区。据此，将研究区划分为极轻微(25.3%)、轻微(12.4%)、中度(40.5%)、强烈(12.2%)、非常强烈(5%)和严重(4.6%)6个土壤侵蚀风险等级。与陡坡相关的中度至重度土壤流失率决定了大部分流域面积。除研究区土壤严重程度的空间分布外，还估算出乌老流域年平均土壤侵蚀速率为31.5 t ha-1 - 1。将后一个量与之前基于RUSLE或其他技术在周围盆地进行的许多研究进行比较，以验证模型的准确性。关键字

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来源期刊

Soil Science Annual SOIL SCIENCE-

CiteScore

2.50

自引率

6.70%

发文量

审稿时长

29 weeks

期刊介绍： Soil Science Annual journal is a continuation of the “Roczniki Gleboznawcze” – the journal of the Polish Society of Soil Science first published in 1950. Soil Science Annual is a quarterly devoted to a broad spectrum of issues relating to the soil environment. From 2012, the journal is published in the open access system by the Sciendo (De Gruyter).