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长江河口盐水入侵锋研究
茅志昌1,2
1.华东师范大学河口海岸研究所 上海;200062
摘要:
根据1959－1988年部分年份长江口南港-南槽、南港-北槽、北港和北文共22个纵向测次资料，计算分析各人海通道内盐水入侵锋的伸退区域及其特征。利用密度佛氏数Fx' 的计算结果，提出确定盐度锋迁移范围和滞流点的判据．研究结果表明，盐度锋对河口最大浑浊带主委有两大贡献：锋区含盐度有利于泥沙絮凝；锋面附近形成的重力环流，有利于泥沙富集，形成最大浑浊带。
关键词:  盐度锋  滞流点  盐淡水交混  重大环流  密度佛氏数
DOI：
分类号:
基金项目:国家自然科学基金资助，9487005－01号
A STUDY ON SALT FRONTS IN THE CHANGJIANG RIVER ESTUARY
Mao Zhichang
Institute of Estuarine and Coastal Research, East China Normal University, Shanghai 200062
Abstract:
Based upon the observed data of partial years from 1959 to 1988, using 22 times of longitudinal hydrological field data of the South and North Channels, the South and North Passages, North Branch in the Changjiang River Estuary, calculations and analyses have given locations and features of the salt fronts in the 4 waterways.

Based on calculations of the densimetric Froude number, the zone of up-down-stream for the fronts and location of null point are determined in the channels of Changjiang River Estuary.

It is indicated that the front plays two roles in the process of the turbudity maximum. Salinity of the front zone is benificial to flocculation. The gravitational circulation in the front zone leads to convergence of sediments from up-downstream.
Key words:  Salt fronts, Null point, Mixing of salt-freshwater, Gravitational circulation, Densimetric Froude number
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