基于数学模型的东江南支流临时挡潮防咸方案分析

Study on temporary tidal and salt blocking scheme of East Jiangnan tributary based on mathematical model

为实现年度抗旱保供水目标,结合咸潮活动规律,确定了3个临时应急挡潮防咸方案。通过建立三维咸潮模型来研究不同方案的防咸效果,构建一维水流水质数学模型研究应急方案对沿线水厂水质的影响。实施应急工程后,对东江北干流的新塘水厂水质会产生负面影响,且应急工程不利于河道正常行洪。建议实施应急工程时,必须加强突发污染事件的监测,同时做好防洪应急预案。项目研究成果可为我国沿海区域抗旱防咸积累经验。

In order to achieve the annual goal of drought resist ance and water supply,combined with the law of salt tide activities,three temporary emergency tidal and salt prevention schemes are determined. Through the establishment of threedimensional salt tide model to study the salt prevention effect of different schemes,and the construction of one-dimensional flow and water quality mathematical model to study the impact of emergency schemes on the water quality of water plants along the line. The results show that scheme 3(blocking the north and south branches together)is the best salt prevention scheme. After the implementation of the emergency project,it will have a negative impact on the water quality of Xintang water plant in the north main stream of Dongjiang River,and the emergency project is not conducive to the normal flood discharge of the river. It is suggested that during the implementation of emergency works,the monitoring of sudden pollution events must be strengthened,and the flood control emergency plan must be made at the same time. The research of the project can accumulate some practical experience for drought and salt resistance in China’s coastal areas.