在邻近我国的内陆架浅海海底,广泛发育着一种特殊的侵蚀堆积地貌体——水下沙脊.它由一系列平行水流方向的线性堆积沙体及其间的侵蚀沟槽组成,其类型复杂,形态各异.它们或呈梳状分布在开敞海湾的湾顶和强流近岸地区,或呈指状展布于河口和海峡出口,水深多小于35米. A special erosional sedimentary body, the underwater sand ridge, is extensively developed on the seabed shallow ocean floor adjacent to our country, and consists of a series of linearly accumulated sand bodies and their intervening trenches parallel to the flow direction, with complex types They are either in a comb shape distributed on the open top of the bay and in the nearshore area of ​​strong currents or at the exit of the estuary and strait at finger-like depths less than 35 meters.