The evaluation and quantification of solids transport in Morocco often uses the Universal Soil Loss Model (USLE) and the revised version RUSLE, which presents a calibration difficulty. In this study, we apply the MUSLE model to predict solid transport, for the first time on a large river basin in the Kingdom, calibrated by two years of solid transport measurements on four main gauging stations at the entrance of the Sidi Mohamed Ben Abdellah dam. The application of the MUSLE on the basin demonstrated relatively small differences between the measured values and those expected for the calibrated version, these differences are, for the non-calibrated version, +5% and +102% for the years 2016/2017 and 2017/2018 respectively, and between −33% and +34% for the calibrated version. Besides, the measured and modeled volumes that do not exceed 1.78 × 106 m3/year remain well below the dam’s siltation rate of 9.49 × 106 m3/year, which means that only 18% of the dam’s sediment comes from upstream. This seems very low because it is calculated from only two years. The main hypothesis that we can formulate is that the sediments of the dam most probably comes from the erosion of its banks.

中文翻译：

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比较 MUSLE 模型和两年的固体输运测量，在 Bouregreg 盆地，以及对 Sidi Mohamed Ben Abdellah 水库沉积的影响，摩洛哥

摩洛哥的固体运输评估和量化经常使用通用土壤流失模型（USLE）和修订版 RUSLE，这存在校准困难。在这项研究中，我们应用 MUSLE 模型来预测固体输运，这是第一次在王国的一个大型流域上，通过对 Sidi Mohamed Ben Abdellah 大坝入口处的四个主要测量站的两年固体输运测量进行校准. MUSLE 在盆地上的应用表明，测量值与校准版本的预期值之间存在相对较小的差异，对于非校准版本，2016/2017 和 2017 年的差异分别为 +5% 和 +102% /2018，校准版本介于 -33% 和 +34% 之间。此外，测量和建模的体积不超过 1。78 × 106 m3/年仍远低于大坝9.49 × 106 m3/年的淤积率，这意味着只有18% 的大坝泥沙来自上游。这看起来很低，因为它是从两年开始计算的。我们可以提出的主要假设是，大坝的沉积物很可能来自堤岸的侵蚀。