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本文研究了三峡水库减少淤积的双汛限水位调度方案及其综合影响 .建议在大洪水来临前 ,将坝前水位从 1 45m下降到 1 35m ,既腾空部分库容防洪、也增加冲沙减淤作用 .双汛限方案对航运和发电有一定的影响 .平均每年断航时间约 7d .但是变动回水区淤积大量减少 ,可改善通航条件 ,库区流速降低 ,既提高航运经济效益 ,也改善坝区通航条件 .后期可增加兴利库容 1 2亿m3以上 ,对于提高发电质量 ,改善枯水期下游通航条件也有好处 .还可增加水库初期排沙比 ,减轻下游河道冲刷 .双汛限方案是保持三峡水库长期效益的措施之一 .
This paper studies the double flood season water level regulation scheme and its comprehensive impact of the Three Gorges Reservoir to reduce siltation.It is proposed to reduce the water level in front of the dam from 1 45m to 135m, The double flood limited program has certain influence on shipping and power generation, with an average annual break time of about 7 days, but a large reduction of siltation in the fluctuating backwater area can improve navigation conditions and reduce the flow velocity in the reservoir area, thereby improving both the economic benefits and the shipping economic benefits Dam navigation conditions.Later increase of more than 1200000000 cubic meters of Xing capacity, for improving power quality, improve the lower reaches of the downstream navigation conditions are also benefits.Also increase the sediment discharge ratio of the initial reservoir to reduce the erosion of the lower reaches of the river. One of the measures for the long-term benefit of the Three Gorges Reservoir.