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根据水文泥沙观测和地形资料分析,30多年来,在长江洪水造床作用、南北港分流口通道的兴衰更替以及北港分流分沙功能增强等因素作用下,北港拦门沙河段发生了较大变化,例六滧沙脊的形成及其沙尾下移;河道中央呈现纵长17km的水下沙脊,形成二槽一脊的W型复式河槽;团结沙外侧发育了北港口北沙等地貌现象。
According to the observation of hydrological sediment and the analysis of topographic data, over the past 30 years, under the action of flood control in the Yangtze River, the rise and fall of the diversion channel in the North-South Harbor and the enhanced function of diversion and sedimentation in the North Harbor, In the central part of the river, an underwater sand ridge with a length of 17km is formed to form a W-shaped double channel with two troughs and one ridge. On the outside of the united sand, the development of the north port such as Beisha and other landscapes .