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北支为典型的喇叭型河口,涨潮流为优势流的水道。根据历年实测资料的分析,北支水道含氯度最大变化幅度为70～15500×10~(-6)。北支的三条港和青龙港测站,当大通流量小于10000 m~3/s时,长江径流对北支的盐水上溯影响很小,三条港和青龙港基本处于比较稳定的高含氯度控制情况;当大通流量为10000～25000m~3/s时,长江径流的影响加强,北支含氯度随潮差变化的现象趋于明显;而当大通流量大于25000m~3/s时,北支水域基本处于淡水径流的控制下。长江枯季大潮期,由于北支的含
North Branch is a typical horn-shaped estuary, rising tide flow channel for the dominant. According to the analysis of observed data over the years, the maximum variation range of water content of Beihai channel is 70 ~ 15500 × 10 -6. When the flow of Chase is less than 10000 m ~ 3 / s, the influence of the runoff from the Yangtze River on the upstream of salt water in the North Branch is very little, while that of the Three Ports and the Qinglong Port of the North Branch is basically stable under relatively high chlorine content When the flow rate of Chase is between 10000 ~ 25000m ~ 3 / s, the influence of the runoff in the Yangtze River is stronger, and the trend of the chlorine content in the North Branch changes with the tide difference obviously. When the flow of Chase is more than 25000m ~ 3 / s, The waters are basically under the control of freshwater runoff. During the dry season of the Yangtze River, due to the inclusion of the northern branch