关键词: 蓄滞洪区；变化环境；超额洪量；布局优化；滁河流域

Abstract: Flood storage and detention areas are an important part of the basin flood control system, and their flood control function is irreplaceable. With significant changes in rainfall, water conditions, engineering conditions, and social conditions in the basin, the need for optimizing the layout of flood storage and detention areas has become more prominent. However, there are few reports on systematic analysis of layout optimization methods. Therefore, a calculation model for basin excess flood volume was constructed, and a layout optimization method and evaluation index system for basin flood storage and detention areas in a changing environment were proposed. Taking the Chuhe River Basin as an example, the changes in the flood storage, release, and evolution laws of the basin and the spatial-temporal distribution characteristics of the excess flood volume were quantitatively analyzed, and the rationality of the current layout and layout optimization of the flood storage and detention areas in the Chuhe River Basin were studied. The results show that the current layout of flood storage and detention areas in the Chuhe River Basin is difficult to effectively address the 0.77×10⁸ m³ of excess flood volume in the Jinji-Chizhen river section when encountering floods similar to the 2020 flood with the rainstorm center located in the upper reaches. Under the guidance of the proposed layout optimization method, measures such as dredging local river sections and appropriately raising the flood control water level were taken to further optimize the spatial-temporal distribution of the excess flood volume. A layout optimization plan for flood storage and detention areas was comprehensively selected from aspects such as flood diversion capacity and socioeconomic impact, systematically resolving the contradiction between the distribution of excess flood volume and flood storage capacity in the Chuhe River Basin. The research results can provide important references for the revision of flood control plans or the design of flood control projects in the Chuhe River Basin, and can also provide technical references for the layout optimization of flood storage and detention areas in other basins.

Key words: Flood storage and detention area; Changing environment; Excess flood volume; Layout optimization; Chuhe River Basin