Erosion and solid transport is a tricky and complex problem that negatively affects natural and urban environments. In Algeria, the effects of this phenomenon are apparent; their impact is no less devastating in the long term than the other spectacular catastrophic phenomena that can be observed. Sixty-five large dams in Algeria are threatened by the reduction of 62% of their storage capacity because of the siltation problem (ANBT) (National Agency for Dams and Water Transfers). The main objective of this work is the evaluation of the impact of the erosion phenomenon on Bechar watershed which is in an area characterized by an arid climate. The universal soil loss equation was used. This model is based on the combination of the five factors (erosivity, erodibility, topography, vegetation cover and support practices) that directly influence this phenomenon. Analytical hierarchy process is used to give a weighting value of each factor according to its degree of influence on the phenomenon. The sediment delivery ratio is calculated to determine the amount of soil that will arrive at the outlet of the watershed and contribute to the storage structures siltation. The obtained results will undoubtedly help decision makers to understand the threat of erosion degree in the study area in order to better take the necessary measures to face this issue.

中文翻译：

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通过数字模型和多准则分析方法的组合，在干旱地区识别有侵蚀风险的区域：贝查尔·瓦迪流域

侵蚀和固体运输是一个棘手且复杂的问题，会对自然和城市环境产生负面影响。在阿尔及利亚，这种现象的影响是显而易见的。从长远来看，它们的影响不亚于可以观察到的其他壮观的灾难性现象。阿尔及利亚的65个大型水坝由于淤积问题（ANBT）（国家水坝与水利管理局）而受到其存储容量减少62％的威胁。这项工作的主要目的是评估侵蚀现象对以干旱气候为特征的贝查尔（Bechar）流域的影响。使用了通用土壤流失方程。该模型基于五个因素（腐蚀度，可蚀性，地形，植被覆盖和支持措施）直接影响这一现象。层次分析法用于根据每个因素对现象的影响程度来给出每个因素的权重值。计算沉积物输送比，以确定将到达流域出口并有助于存储结构淤积的土壤量。毫无疑问，所获得的结果将有助于决策者了解研究区域内侵蚀程度的威胁，以便更好地采取必要措施来应对这一问题。计算沉积物输送比，以确定到达流域出口并有助于存储结构淤积的土壤量。毫无疑问，所获得的结果将有助于决策者了解研究区域侵蚀程度的威胁，以便更好地采取必要措施来应对这一问题。计算沉积物输送比，以确定到达流域出口并有助于存储结构淤积的土壤量。毫无疑问，所获得的结果将有助于决策者了解研究区域内侵蚀程度的威胁，以便更好地采取必要措施来应对这一问题。