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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 >Reservoir deltas and their role in pollutant distribution in valley-type dam reservoirs: Les Kralovstvi Dam, Elbe River, Czech Republic
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Reservoir deltas and their role in pollutant distribution in valley-type dam reservoirs: Les Kralovstvi Dam, Elbe River, Czech Republic

机译：水库Deltas及其在谷型坝水库污染物分布中的作用：LES KRALOVSTVI水坝，斯巴河，捷克共和国

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摘要

Interpretation of catchment pollution history from sediment cores is a common approach for dam reservoirs, but relatively little is known about the spatial distribution of pollutants in the lithologically diverse depositional subsystems. We studied the depositional system of a hundred-year-old valley-type reservoir of the Les Kralovstvi Dam built in 1919 on the upper reaches of the Elbe River, Czechia. Based on the analysis of pre-dam river valley morphology using historical topography maps with 1 m vertical resolution, 30 ground-penetrating radar sections on the lake and Cs-137 dating of four cores, we described a deltaic sediment body with maximum thickness of similar to 11 m, accumulation rates ranging from 3.6 to 9.7 cm/yr, and an annual loss in reservoir capacity of 0.8%. The sediment body has a distinct delta shape in the longitudinal section, with a delta platform dissected by a channel (topsets) and delta slope (foresets) and a ponded basin (bottomsets) located near the dam. The upstream sections of the channels are prone to erosion and sediment redistribution into downstream parts of the reservoir, as indicated by ground-penetrating radar sections and distribution of Cs-137 in younger sediment strata.
机译：沉积物核心集水污染史的解释是坝储存器的常见方法，但相对较少地了解岩性多样化沉积子系统中污染物的空间分布。我们研究了一座百年谷型水库的沉积系统，1919年建于1919年，在捷克河的上游。基于使用1米垂直分辨率的历史地形地图对坝体地形映射的分析，湖泊和CS-137的四个核心的30个地面穿透雷达部分，我们描述了一种最大厚度相似厚度的红细沉积物体到11米，积累率范围从3.6到9.7厘米/年，储层容量的年度亏损为0.8％。沉积物体在纵向部分中具有明显的δ形状，具有通过通道（顶部）和Δ斜坡（前提图）和位于坝附近的倾角的Δ平台。通道的上游部分易于侵蚀和沉积物再分布到储层的下游部分，如地面穿透雷达部分和沉积物层中的CS-137的分布所示。

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