长江口南支南岸水域盐水入侵来源分析

ANALYSIS OF SOURCES OF SALTWATER INTRUSION ALONG SOUTH BANK OF SOUTH BRANCH OF YANGTSE RIVER ESTUARY

本文根据大量实测资料,分析了长江口南支南岸水域盐水入侵源和氯化物的时空变化规律。研究结果表明,本河段盐水来自北支、北港和南港。在浏河—石洞口水域存在一个比其上、下游氯化物均要高的高浓度带。根据盐度变化特征和盐水来源,把南支南岸分为四个区段,为合理开发利用长江淡水资源提供科学依据。

Based upon a large amount of data from field observation, analyses of the sources of saltwater intrusion along the south bank of South Branch of the Yangtse River estuary, and the temporal-spatial variation pattern were made. The results showed that three sources of saltwater intrusion were from the North Branch, the South Channel and the North Channel. The interactions of the three sources varied with the changes in runoff, tidal current and the evolution of the estuary. The study indicated that there was a zone featured by high value in concentration in chlorinity between the mouths of the Liuhe River and the Shidong River along the South Branch. In terms of the variation of saltwater sources and chlorinity , the South Branch were divided into four sections to be considered for the full exploitation of freshwater resources of the estuary.