珠江河口区枯季咸潮入侵与盐度输运机理分析

Analysis of Saline Intrusion and Salinity Transport Mechanism in Estuary of Pearl River

以河口区物质平衡原理为基础,应用物质输运机理对珠江三角洲河口区盐度净输运进行分析,对比各动力因子对盐度净输运贡献的大小。结果表明:珠江三角洲各河口盐淡水混合以缓混合型为主,分层系数均在0.01～1.0之间;盐度净输运主要是由斯托克斯输运和平均流输运控制,潮抽吸作用也不容忽视,其中,斯托克斯输运是导致咸潮上溯的最主要动力因素;珠江三角洲各口门径潮流情况及动力条件各有不同,除黄金站和挂定角V6站外,盐度输运以向上游为主,咸潮上溯明显。

Base on material balance principle in estuary,analysis of the salinity transport in the Pearl River estuary was made by using the material transport mechanism.Comparing the contribution of the controlling factors,some conclusions can be made that the salt and fresh water is mainly partially mixed with the stratification coefficients between 0.01～1 at all stations.The net salinity transport is mainly controlled by advection and Stokes Drift,and the tidal pumping is also important.The Stokes Drift is the main cause of saline intrusion.Excepting Golden Station and Guadingjiao V6 Station,the net salinity transport is landward,the saline intrusion is obvious.