水下沙脊

我国邻近海域的水下沙脊

The submarine sand ridges in China waters

对比20世纪70年代和80年代的资料，近岸物质趋向粗化，北支水下沙脊发育，现代三角洲不断向外扩展，残留砂面积减少。

Based on comparisons with surface sediment types in 1970s and 1980s , the modern subaqueous delta is expanding seaward and mixing with the relict late Pleistocene delta sands , meanwhile , nearshore sediment is coarsening and subaqueous sand ridge is developing .

根据沉积结构特征可将杭州湾划分为五种不同的沉积环境：东部湾底、西部湾底、庵东浅滩、近岸深槽和水下沙脊。

According to the sedimentary textures of bottom sediments and hydrodynamic conditions , the following sub-environments can be identified in the Hangzhou Bay : east part of the bay bottom , west part of the bay bottom , Andong shoal , nearshore deep channel and tidal sand ridges .