In the convergence zone of the estuary and the ocean, there always exists the barshoal which has become an obstacle to navigation for the large-scale vessels in seaward channel.
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。
2
The Yangtze River estuary is a large heavily sediment-laden estuary where the barshoal with dozens of kilometers in length is formed due to its unique feature of water-sediment movement.
长江口是巨型多沙河口，其特有的水沙运动特点，形成了长达数十公里的拦门沙区段。
3
A few minutes later, Tom was in the shoal water of the bar, wading toward the Illinois shore.