Water storage strategy in post-flood period for hongze lake based on flood utilizationEI北大核心CSCD

基于洪泽湖的地理地形特征,采用MIKE平台构建了湖泊及其蓄滞洪区联合运用的水文水动力模型,实现了对湖、陆水流运动和水量交换与控制的精细化模拟,并制定了后汛期不同蓄水时机和蓄水方案构成的蓄水策略样本库;通过丰、平、枯多种来水情景大规模的数值模拟,对不同典型年蓄水策略进行了评价和优选。结果表明:若洪泽湖后汛期来水属于丰水年系列,应于9月10—20日偏后期伺机蓄水,采用“先泄后蓄”、泄水效率较高的蓄水策略,尽量避开完整的洪水过程;若来水属于平水年系列,应于9月10—20日偏前期伺机蓄水,采用“先泄后蓄”、泄水效率较低的蓄水策略,在洪水的退水阶段起蓄;若来水属于枯水年系列,应于8月31日—9月10日起蓄,采用“先蓄后泄”的蓄水策略,泄水效率的选择应结合来水预报信息,在洪水的起涨段或中段即可拦蓄。

Water storage strategy in post-flood period for Hongze Lake based on flood utilization

Based on the geographical and topographical characteristics of Hongze Lake, the MIKE platform was introduced to build a hydrological-hydrodynamic model for the incorporated system of the lake and its flood detention basin to realize an elaborate simulation of flow movement and water exchange and control between lakes and lands. Then, we developed a water storage strategy sample library composed of different impounding times and water storage schemes in the post-flood period, and carried out large-scale numerical simulations under various inflow scenarios, including high-flow, medium-flow, and low-flow scenarios. Finally, water storage strategies for different typical years were selected and evaluated. The results show that when facing a high-flow period, the impounding time should be set later between September 10th and September 20th, and a scheme of discharge before storage with higher discharge efficiency is recommended, in which a complete flood process should be avoided as far as possible; when facing a medium-flow period, the impounding time should be set earlier between September 10th and September 20th, starting in the flood recession stage, and a scheme of discharge before storage with relatively low discharge efficiency is recommended; when facing a low-flow period, the impounding time should be set between August 31st and September 10th, and a scheme of storage before discharge is recommended, in which the selection of discharge scale should be combined with flood forecasts, and the flood should be intercepted and stored in the rising or middle stage.