清江梯级水库汛限水位联合设计与运用

Joint design and operation of flood limited water levels for Qingjiang cascade reservoirs

在不降低清江流域自身防洪标准、不影响清江梯级水库在长江防洪系统中发挥作用的前提下,建立梯级水库汛限水位设计与运用模型,科学利用洪水资源。采用清江流域1951-2009年的日降雨径流系列进行分析计算,研究结果表明:水布垭和隔河岩水库的汛限水位分别采用387.5m和196m的方案,在保证原设计防洪标准不降低的前提下,可使清江梯级水库多年平均发电量增加0.21亿kW.h,增幅为0.302%;其中平水年和枯水年增加的发电效益更为显著。开展汛限水位联合优化设计,可显著地提高梯级水库的综合利用效率。

A joint design and operation model of flood limited water levels is proposed and discussed in this paper for efficient use of flood water resources by cascade reservoirs. This model satisfies the requirement that the designed operation has no impact on the flood control standards of the Qingjiang basin, nor impact on these reservoirs＇ role in the Yangtze River flood control system. By using the data of daily rainfall and runoff of the basin in the period of 1951 - 2009, the results show that if the flood limited water levels of the Shuibuya and Geheyan reservoirs are fixed at 387.5m and 196.0m, respectively, then they can generate more power of 0. 021 billion kW. h or an 0. 302% increase in the annual average output relative to the existing operation. Thus, joint design can greatly increase reservoirs＇ comprehensive benefits, particularly, in normal and dry years.