潮流冲刷槽是河口湾中重要的地貌类型。杭州湾是一个强潮海湾，它的北部在潮流作用下形成的冲刷槽具有典型性。本文通过动力、地貌和沉积相结合方法，在冲刷槽几何形态和动态特征分析基础上，论证了冲刷槽水流结构和泥沙输移，并指出冲刷槽在潮流作用下，纵向延伸和垂向增深较小，处于基本稳定状态，为港口建设提供依据。

There exist several scouring channels (Jin Shan, Qunagongting, Zhaou etc.) westward fromJin Shan in northern Hangzhou Bay. Their depth is about 20-50m, with a total lengtli morethan 50km. The scouring channels are developed at the top of Quaternary loose sedimentlayer, and they are formed gradually by the action of strong tidal current. The variation oftheir northern slope is small in recent 30 years.Their main channel and southern slope aremuch erosion, with seasonal variations.The sediments of northern Hangzhou Bay come mainly from the Changjiang estuary.The volume of annual sediments up stream Jin Shan amounts +10 -20 million tons. Thechange of erosion-deposition is small. The erosion is in equilibrium with the deposition. Butthe scouring channel evolution has still the possibilities to extend both in length and in width.