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| | The computation of two-dimensional flow in open channel bends with deflection angles from 90° to 180° has been successfully completed by using the interpolational element method suggested by the author. The study provides a preliminary base for the two-dimensional sediment computation of an alluvial river. | | 本文用插值元法(IEM)计算了二维明渠各类弯道流场,使这一问题获得了一种新的解决办法。文中计算了90°,180°的连续平底弯道,并对三峡枢纽通航明渠进行了验证计算,结果说明插值元法可计算任意二维明渠弯道流场,为二维明渠泥沙数值计算打下了基础。 | | 文摘来源 | | 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... | | 为了研究上游为两个水库共同调度的情况下水库泥沙的淤积特性 ,选取了金沙江干流向家坝水电站作为研究对象。采用自主开发的一维非恒定流泥沙冲淤计算数学模型《SUSBED -UNSTEADY》对向家坝水电站水库泥沙淤积进行了计算 ,具体对水库库区泥沙淤积、水库河床纵剖面变化、水库库容损失、水库排沙比、库区坝前泥沙淤积厚度作了计算 ,进一步分析泥沙淤积形态、泥沙淤积速度、库容损失以及排沙比的变化特点 ,得出了以下结论 :由于上游水库的调度作用 ,使库区来水来沙较天然大不相同 ,导致库区泥沙淤积呈现带状淤积为主 ;前期泥沙淤积速度较慢 ,以后逐年加快 ,接近平衡时 ,淤积速度才又减慢 ;库容损失逐年增加 ;排沙比较大 ,水库运行前期排沙比较大但逐年减小 ,以后又逐年增大至水库淤积平衡。此外 ,还简要介绍了向家坝、溪洛渡以及雅砻江上的二滩电站的联合运行的综合拦沙效应 | | 文摘来源 | |   |
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