河口拦门沙，广义的指由心滩、沙岛、浅水航道和某些横亘河口的沙嘴所组成的拦门沙系；狭义的仅指口门沉积带航道上的浅段。拦门沙现象早就为人们所熟知，从20世纪50年代以来，已对它的成因、沉积构造和演变进行了较系统的研究。
因上游来沙量增加，在最大浑浊带中心和河口拦门沙处悬浮泥沙浓度趋于增加。
The suspended sediment concentration at the center of the turbidity maximum zone and near the sand bar tends to increase because of the sediment addition from upstream.
通过分析灌河口附近海域的泥沙运动特点，采用经验公式从定性和定量两个方面对灌河口拦门沙整治工程后的岸滩演变进行了预报。
By analyzing the sediment movement characteristics, we use the selected empirical formulas to forecast the coastal evolution after the regulation project in Guanhe estuary.
在河口与海洋交汇的河口地区都存在着一定范围的拦门沙浅滩，成为大型船舶通海航道的碍航区段。
In the convergence zone of the estuary and the ocean, there always exists the bar shoal which has become an obstacle to navigation for the large-scale vessels in seaward channel.
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