长江河口盐水入侵锋研究

根据１９５９－１９８８年部分年份长江口南港南槽、南港－北槽－北港和北支共２２个纵向测次资料，计算分析各入海通道向盐水入侵锋的伸退区域及其特征。利用密度佛氏数Ｆ＇ｘ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，盐度锋对河口量大浑浊带主要有两大贡献：锋区含盐有利于泥沙絮凝；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。

A STUDY ON SALT FRONTS IN THE CHANGJIANG RIVER ESTUARY

Based upon the observed data of partial years from 1959 to 1988, using 22times of longitudinal hydrological field data of the South and North Channels, theSouth and North Passages, North Branch in the Changjiang River Estuary, calcula-tions and analyses have given locations and features of the saIt fronts in the 4 wa-terways.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 ofChangjiang River Estuary.It is indicated that the front plays two roles in the process of the turbuditymaximum. Salinity of the front zone is benificial to flocculation. The gravitationalcirculation in the front zone leads to convergence of sediments from up-downstream.