北支盐水入侵对长江口水源地影响研究

Impact of intruded saline water via north branch of theYangtze river on water source areas in the estuary area

在介绍长江口 (徐六泾以下 )已建和规划水源地分布以及氯度观测站布设情况的基础上 ,根据近 10a的长序列、大范围氯度同步观测资料 ,揭示了长江口南北支水域洪、枯季含氯度时空分布的主要规律 ,明确提出 :南北港盐水上溯对长江口已建和规划水源地的连续不宜取水天数不构成威胁 ,而北支盐水倒灌是南支水域盐水入侵的主要来源 ,近年有显著增强的趋势。采取适当的工程措施 ,削弱或切除北支盐水倒灌进入南支的源头 ,对低成本开发和利用长江口淡水资源 ,支持南水北调工程上马 ,确保上海。

On the basis of presenting the distribution of established and planned water source sites and the arrangement of chlorinity observation stations in the Yangtze estuary region (downstream from Xuliujin), and according to long-sequence large-scope simultaneously observed data of chlorinity for about ten years, the principal distribution laws of chlorinity in time and space in high water and low water seasons in the water area of the south and north branch rivers in the Yangtze estuary region were revealed. The reverse flow of saline water in Nangang and Beigang could not affect the number of successive days not suitable for taking water from the established and planned water source sites in the Yangtze estuary region, and the reverse flow of saline water in the north branch river was the main source of the saline water intrusion into the south branch river's water area. This trend of saline water intrusion was remarkably increasing in recent years. Some suitable structural measures should be taken to mitigate or cut out the source of saline water flowing from the north branch river into the south one, and this will be of great strategical significance to developing and utilizing the fresh water resources in the Yangtze estuary region at low cost, supporting the S-to-N Water Transfer Project and guaranteeing Shanghai municipality's and Jiangsu Province's sustainable development.