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定量研究水库的拦沙效应是揭示水库对河道泥沙输移影响的关键之一.在系统分析三峡上游已建大型水库拦沙作用的基础上,提出了长江上游水库群综合拦沙率计算公式,预测了在建及拟建大型水库运行后三峡上游大型水库的拦沙效应.研究结果表明,现状条件下(1991-2005年),三峡以上地区大型水库拦沙量约为9 860万t/a,大型水库群综合拦沙率约为20.3%.近期拟建大型水库运行后(2020年),三峡以上地区大型水库群年均新增拦沙量将达25 500万t/a,大型水库群综合拦沙率将增加至75.2%.
It is one of the keys to reveal the effect of reservoirs on sediment transport in a quantitative study of sediment retention in reservoirs.On the basis of systematic analysis of the sediment-retaining effects of large reservoirs in the upper reaches of the Three Gorges, , Predicted the sediment-holding effect of the large reservoirs upstream of the Three Gorges after the construction and construction of large-scale reservoirs.The results show that under the current conditions (1991-2005), the sediment-carrying capacity of large-scale reservoirs above the Three Gorges area is about 96.60 million t / a, the comprehensive sedimentation rate of large reservoirs is about 20.3% .In recent large-scale reservoirs after the operation (2020), large reservoirs above the Three Gorges area an average annual sediment deposition will reach 250 million t / a, large reservoirs Group comprehensive barricade rate will increase to 75.2%.