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首页> 外文会议>2011 International Conference on Electric Technology and Civil Engineering >Impacts of Three Gorges Reservoir's water storage on flow-sediment characteristics of Dongting Lake
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Impacts of Three Gorges Reservoir's water storage on flow-sediment characteristics of Dongting Lake

机译：三峡水库蓄水对洞庭湖水沙特征的影响

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摘要

Based on the field surveyed data of flow-sediment, the subject of Three Gorges Reservoir''s water storage operation influence on flow-sediment characteristics of Dongting Lake is systematically studied by the comparison method. The results are represented as follow: Firstly, flow and sediment diversion ratios of Three Outlets of Jinjiang River respectively decrease from 18.5 % and 21.4% to 11.7% and 13.6%, which causes the ratios of Three Outlets occupying the total inflow quantity in runoff volume and sediment discharge respectively decline from 41.5% and 82.9% to 21.6% and 58.5%. Secondly, average inflow flow-sediment discharge in several years respectively reduces 531×108m3 and 4715×104t. Silting rate of the lake basin decreases from 70.4% to 39.2%, and the degression scope is 31.2%. Thirdly, average change rates of water level in west, south and east Dongting lake in several years respectively decrease 1.23m, 1.45m and 1.88m. Lastly, the erosion of lake basin is more than the silting and the diameter of silty sediment particles tends thinner. And sediment discharge ratios of west and northeast Dongting Lake both synchronously rise.
机译：在此基础上，通过比较方法，系统地研究了三峡水库蓄水作业对洞庭湖水沙特征的影响。研究结果如下：首先，晋江三个出口的流量和泥沙分流比分别从18.5％和21.4％下降到11.7％和13.6％，这导致三个出口的比例占径流量的总流入量。泥沙排放量分别从41.5％和82.9％下降到21.6％和58.5％。其次，几年平均入泥沙流量分别减少531×108m3和4715×104t。湖盆的淤积率从70.4％下降到39.2％，下降范围为31.2％。第三，西洞庭湖，南洞庭湖和东洞庭湖几年来的平均水位变化率分别降低了1.23m，1.45m和1.88m。最后，湖盆的侵蚀大于淤积，粉质沉积物颗粒的直径趋于变薄。西洞庭湖和东北洞庭湖的排沙率均同步上升。

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