南淝河生态补水方案研究

Study on Ecological Water Replenishment Programme of Nanfeihe River

采用Tennant法计算南淝河生态基流和生态需水,结合河道和水工程条件确定多个生态补水方案组合。利用MIKE软件构建南淝河水动力模型,采用生态补水试验观测数据对模型率定和验证,对不同方案下南淝河生态补水进行了水动力模拟。结果表明:在现状工况下,实施周期性补水。补水频率为一旬补水1次,每次补水4天,补水规模为15 m3/s,年补水量为1.8亿m3,可明显改善河道生态;丰水期适当减少补水频次及补水量,枯水期则增加补水频次及补水量。

Tennant method is used to calculate the ecological base flow and ecological water demand of Nanfei River.Multiple combinations of ecological water replenishment schemes are determined in combination with river channel and water engineering conditions.The dynamic model of Nanfei River is constructed by using Mike software.The model is calibrated and verified by using the observation data of ecological water replenishment test,and the hydrodynamic simulation of ecological water replenishment of Nanfei River under different schemes is carried out.The results show that under the current working conditions,periodic water replenishment is implemented.The frequency of water replenishment is one time in ten days,each time for four days.The water replenishment scale is 15 m 3/s,and the annual water replenishment volume is 180 million m 3,which can significantly improve the river ecology.The frequency and amount of water replenishment shall be appropriately reduced in wet season,and increased in dry season.