As more and more water projects are built on rivers, the flood control operation becomes more complex. Studies on the optimal flood control operation are very important to safeguard human life and property. This study focused on optimizing the operation of a complex flood control system composed of cascade reservoirs, navigation-power junctions, flood storage areas, and flood control points. An optimal model was established to jointly maximize flood peak reduction rates of downstream flood control points. A hybrid algorithm named the Dynamic Programming-Progressive Optimality Algorithm (DP-POA) was used to solve this model, and the middle and lower reaches of the Ganjiang River were selected as a case study. The results show that flood reduction at three downstream flood control points ranged from 1080 to 5359 m3/s for designed floods with different return periods, which increased by about 333~1498 m3/s in comparison with the conventional operation. Considering that the maximum water level of reservoirs using DP-POA and the conventional operation is the same, this indicated that DP-POA can make full use of the reservoirs’ flood control storage to reduce downstream flood peaks. In addition, the flood diversion volume of the flood storage area using DP-POA ranged from 0.33 × 108 to 1.79 × 108 m3 for designed floods with 200-year, 300-year, and 500-year return periods, which is smaller than that using the conventional operation.

中文翻译：

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由梯级水库、航电枢纽和蓄洪区组成的复杂防洪系统的优化运行

随着越来越多的水利工程建在河流上，防洪工作变得更加复杂。研究最佳防洪运行对保障人类生命财产安全具有重要意义。本研究的重点是优化由梯级水库、航电枢纽、蓄洪区和防洪点组成的复杂防洪系统的运行。建立了联合最大化下游防洪点洪峰降低率的优化模型。采用动态规划-渐进最优算法（DP-POA）的混合算法对该模型进行求解，并以赣江中下游地区为例进行研究。结果表明，不同重现期的设计洪水，下游三个防洪点的减洪幅度为1080～5359 m3/s，较常规操作增加约333～1498 m3/s。考虑到使用DP-POA的水库最高水位与常规操作相同，这说明DP-POA可以充分利用水库的防洪库，降低下游洪水高峰。此外，对于200年、300年和500年重现期的设计洪水，使用DP-POA的蓄洪区的分洪量范围为0.33×108～1.79×108 m3，小于使用常规操作。考虑到使用DP-POA的水库最高水位与常规操作相同，这说明DP-POA可以充分利用水库的防洪库，降低下游洪水高峰。此外，对于200年、300年和500年重现期的设计洪水，使用DP-POA的蓄洪区分洪量为0.33×108～1.79×108 m3，均小于使用常规操作。考虑到使用DP-POA的水库最高水位与常规操作相同，这说明DP-POA可以充分利用水库的防洪库，降低下游洪水高峰。此外，对于200年、300年和500年重现期的设计洪水，使用DP-POA的蓄洪区的分洪量范围为0.33×108～1.79×108 m3，小于使用常规操作。