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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Use of bathymetry and clay mineralogy of reservoir sediment to reconstruct the recent changes in sediment yields from a mountain catchment in the Western High Atlas region, Morocco
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Use of bathymetry and clay mineralogy of reservoir sediment to reconstruct the recent changes in sediment yields from a mountain catchment in the Western High Atlas region, Morocco

机译：储层沉积物的沐浴和粘土矿物学在摩洛哥西部高地图集地区的山地集水区重建近期沉积物产量的最新变化

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摘要

The dam of Takerkoust, located at the outlet side of N'fis Basin (Western High Atlas of Morocco), is one of the strategic reservoirs in Morocco facing a serious problem of siltation due to soil erosion. A paleo-hydrology approach combining chronological and sedimentological analyses is conducted to understand the evolution of the depositional sediment history of the Takerkoust reservoir between 1988 and 2016. First, a series of 8 bathymetric surveys in the Takerkoust reservoir was used to determine the chronology of flood event deposits. Second, grain size distribution, clay mineralogy (XRD) and organic matter content were analyzed in 2 cores drilled in the Takerkoust reservoir and the newly build Ouirgane reservoir in upstream (from which 46 samples were taken). Third, Soils samples collected from the uppermost soil horizons (First 5 cm) of different localities of the N'fis watershed were also analyzed to identify sediments origins. Eleven couplets with different textures and thickness are identified in the Takerkoust reservoir corresponding to the period 1988-2016. The highest correlation is observed between instantaneous maximum flow and thickness of the sandy component of the couplets. The variation of the siltation rate allows highlighting two distinct periods: the oldest period (1988-1999) characterized by a high sediment yield SY (908.6 tkm(-2).yr(-1)) and a youngest one (1999-2016) characterized by a low SY (203.9 tkm(-2).yr(-1)). The newly built Ouirgane dam, seems to be responsible for the decreasing siltation rate and change of the clay assemblages of the sedimentary series in Takerkoust reservoir.
机译：Takerkoust的大坝位于N'FIS盆地的出口（摩洛哥西部高地图集），是摩洛哥的战略水库之一，由于土壤侵蚀而面临严重的淤积问题。进行了古水文方法，以了解时间和沉积学分析，了解1988年至2016年间Takerkoust储层沉积沉积物史的演变。首先，采用了一系列8座8次在Takerkoust储层中的沐浴疗法来确定洪水的年表事件存款。其次，在Takerkoust储层中钻的2个芯中分析了晶粒尺寸分布，粘土矿物学（XRD）和有机物质含量，新构建了上游的Ouirgane储层（从中取出46个样品）。第三，还分析了从N'FIS流域的最高土壤视野（前5厘米）的土壤中收集的土壤样品，以鉴定沉积物起源。在与1988 - 2016年期间的Takerkoust储层中确定了具有不同纹理和厚度的11个对联。在对联的瞬时最大流量和厚度之间观察到最高的相关性。淤积率的变化允许突出两个不同的时期：最古老的时期（1988-1999），其特征在于高沉积物产量SY（908.6 TKM（-2）.YR（-1））和最年轻的一（1999-2016）其特征在于低SY（203.9 TKM（-2）.YR（-1））。新建的奥里戈纳大坝似乎负责降低Takerkoust储层沉积系列沉积系列的淤泥汇率和变化。

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