花园湖行洪区启用条件与分洪效应研究

采用数值模拟方法，分析淮河流域百年一遇来流条件下，花园湖行洪区的分洪效应。结果表明:当进洪闸、退洪闸同时开启时，花园湖行洪区对其上游的淮河干流水流以削峰为主，对其下游的淮河干流水位以错峰为主；花园湖行洪区中出入流速极值均出现在退洪闸处，特别是在退洪闸反向进洪初期，退洪闸处流速可达0.7 m/s；退洪闸适当晚开既不会增大淮河干流的最高水位，还可有效减缓花园湖行洪区的淹没进程，有利于提高淮河干流调蓄洪水的能力。

Launch condition and flood diversion effect of flood diversion area named Garden Lake

In this study, numerical simulations were carried out to analyze the effects on flood diversion by the Garden Lake in the case of a flood with ahundred-year return period. The results show that when the Garden Lake is in operation, that is to say, at the time that the flood gates are kept open, the Garden Lake flooding area plays a role of cutting the peak of discharge in the upstream of Huaihe River and shifting the peak of water level in the downstream of Huaihe River. In addition, the extreme values of flow velocity in the Garden Lake flooding area appear near the downstream sluice gate. Especially at the beginning of the inversed discharging flood, the flow velocity at the downstream sluice gate can reach up to 0. 7 m/s. Last but not the least, the results reveal that properly delaying the operation of Gargen Lake flood area, despite of increasing the maximum water level of mainstream of Huaihe River, can effectively slow down the inundating process of the flooding area of the Garden Lake, which is conducive to improving the ability of the Huaihe River to regulate and store floods.