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长江河口系多级分汊潮汐河口 ,其盐水入侵有外海入侵、倒灌、浅滩通道水体交换及漫滩归槽等 4种形式 ,时间上有周日、朔望、洪枯季、年际等变化特点 ,南支—南港河段纵向上存在 3条盐度梯度急剧变化分界线 ,形成其特有的盐度时空变化规律。研究成果对宝钢水源长江引水方案的形成起了重要作用 ,并为陈行水库的选址、库容设计提供了基础数据。在长江河口建库 ,研究工作的重点是推算最长连续取不到合格水的天数 ,它是确定库容的关键数据。
The Yangtze estuary is divided into multi-level tidal estuaries with invasion of offshore water by intrusion, intrusion of inundation channel, exchange of water bodies in shoals and floodplain-draining of tidal flats. There are four types of changes in the time such as the sun, the moon, the flood season and the interannual variation There are three demarcation lines of sharp changes in salinity gradients along the longitudinal direction of Nanzhan - Nangang River, forming the characteristic of temporal and spatial variation of salinity. The research results have played an important role in the formation of Baosteel Yangtze River water diversion scheme and provided the basic data for the site selection and storage design of Chenhang Reservoir. The establishment of a reservoir at the mouth of the Yangtze River, the focus of the research work is to calculate the longest continuous access to qualified water days, it is to determine the key data storage capacity.