渤海湾曹妃甸深槽形成机制及稳定性分析

渤海湾湾口曹妃甸岬角地貌特征明显，紧贴甸头前沿发育有渤海湾最深的巨型潮汐深槽。该深槽的发育有着一定的地质构造基础，曹妃甸沙岛形成的岬角地貌构成了深槽的边界条件，由此引起的局部潮流增大成为深槽形成与维持的主要动力条件。曹妃甸深槽长期以来边界条件与动力条件已基本适应，周边滩槽形势基本稳定，海床以轻微冲刷态势为主。近年来随着曹妃甸港区开发的不断深入，各种工程建设对深槽冲淤演变的影响日益增强，但由于并没有改变曹妃甸深槽的边界条件及动力形成机制，深槽稳定性良好。

Formation Mechanism and Stability of Caofeidian Channel in the Bohai Bay

Caofeidian barrier island extends southward into the Bohai Bay in the form of headland, just in front of which there is a deep channel with the largest water depth of 41 m. The formation of the deep channel was based on the old river valley extending from the Haihe River Estuary to the Bohai Sea Strait. The headland topography of Caofeidian barrier island forms the boundary condition of the deep channel, and the obvious velocity increase by headland effect becomes the dynamic condition of the deep channel development. The boundary condition and dynamic condition for the deep channel are almost adaptive for a long time, and the seabed is basically in a state of stability, and the the deep channel is in a state of slight erosion with short sediment supply. In recent years, the development of the Caofeidian harbor area has a significant effect on the evolution of the deep channel. The engineering practice shows that during 2004-2009, the seabed is basically in a state of erosion-deposition equilibrium with slight ersoion, and the deep channel is stable, which proves that the development of the Caofeidian harbor area did not change the boundary and dynamic conditions of the deep channel.