Reservoir sediment computation of Xiangjiaba hydropower plant
Reservoir sediment computation of Xiangjiaba hydropower plant
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发表时间：
2003
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通讯作者：
Hu Yan
中科院分区：
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作者：
Hu Yan
为分析上游两座水库联合调度下水库的淤积特性，以金沙江干流向家坝水电站为研究对象。将作者开发的一维非恒定流泥沙计算模型SUSBED-UNSTEADY应用于向家坝水电站水库泥沙淤积计算。具体计算内容包括水库泥沙淤积、水库河床剖面变化、库容损失、水库排沙比、坝前泥沙淤积厚度等，并进一步分析了泥沙淤积形态、淤积速率、库容损失和排沙比的变化特征。得出以下结论。由于上游水库的调节作用，水库入库水沙与自然条件下有很大差异，水库泥沙淤积主要呈带状，前期淤积速率较慢，并逐年增加，到泥沙平衡后又逐渐减慢，水库库容损失逐年增加，水库运用初期的排沙比略大，但逐年减小，之后又逐渐增大，直至库内泥沙平衡。介绍了金沙江向家坝水电站、溪洛渡水电站和雅砻江二滩水电站联合运行的综合拦沙效果。
In order to analyze the silting features of reservoir under co-regulation of 2 upstream reservoirs, the Xiangjiaba hydropower station on main Jinsha river was chosen as the research object. One-dimensional unsteady flow sediment computation model, SUSBED-UNSTEADY, developed by authors, was applied to reservoir sediment deposition computation of Xiangjiaba hydropower plant. The concrete computation issues include sediment deposition in the reservoir, variation of reservoir river bed profile, reservoir capacity losses, sediment discharge ratio of the reservoir, sediment deposition thickness in front of the reservoir dam as well as further analysis on sediment deposition form, sediment accumulation rate, variation features of reservoir capacity losses and sediment discharge ratio. The following conclusions are obtained. Due to the regulation of upstream reservoirs, the inflow water and sediment of the reservoir are very different from those of natural condition, resulting that the sediment of the reservoir deposits mainly in belt-shape ; the early-stage sediment deposition rate is slower and gradually increases year by year and then slows down near the sediment balance; the reservoir capacity losses increase year by year; the sediment release ratio in the early operation period of the reservoir is comparably larger but gradually decreases year by year, and then increases again until sediment balance in the reservoir. The comprehensive sediment retaining effect under the co-operation of Xiangjiaba hydropower plant and Xiluodu hydropower plant on the Jingsha river and Ertan hydropower plant on Yalong river is also introduced.