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Quantification and Evaluation of Water Erosion: Application of the Model SDR – InVEST in the Ziz Basin in South-East Morocco
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Author(s): Souad Ben Salem (Cadi Ayyad University, Morocco), Abdelkrim Ben Salem (Cadi Ayyad University, Morocco), Ahmed Karmaoui (Southern Center for Culture and Sciences (SCCS), Morocco), Mohammed Khebiza Yacoubi (Cadi Ayyad University, Morocco)and Mohammed Messouli (Cadi Ayyad University, Morocco)
Copyright: 2020
Pages: 22
Source title:
Decision Support Methods for Assessing Flood Risk and Vulnerability
Source Author(s)/Editor(s): Ahmed Karmaoui (Southern Center for Culture and Sciences (SCCS), Morocco)
DOI: 10.4018/978-1-5225-9771-1.ch007
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Abstract
The Ziz Watershed is located in the arid zones of South-Eastern Morocco and belongs to the large basin of Ziz-Rheris. In this basin, floods are related to natural factors and mainly to the occupation of the hydraulic public domain and the human intervention on the courses of the rivers. Increases in sediment yield are observed in many places in the Ziz, dramatically affecting water quality and reservoir management. In order to map overland sediment generation and delivery to the stream (studying the service of sediment retention), the InVEST sediment delivery ratio (SDR) model was applied. The sedimentation analysis in the Hassan Dakhil Dam, located in this watershed, shows that there is a very important erosion rate. The proof is the rapid filling of the dam. This is due to the transport of sediments in the rivers. If this situation continues at the current rate, the dam will no longer be fully operational for irrigation by 2050.
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