辽东湾中北部浅层埋藏古河道沉积特征及对海上工程的影响

Sediment Characteristics of the Shallow Buried Paleo-Channels in the North-central Liaodong Bay and Their Negative Effects on Nautical Engineering

以大量钻孔资料总结出辽东湾中、北部全新世 8.5kaB .P .以来沉积了第一海相层 ,与下伏盛冰期的陆相层之间构成不整合界面 (R1 )。界面以下的B层中发育大量埋藏古河道 ,古河道NE向展布 ,宽 2 0～ 80 0m ,埋深 2～ 1 3m ,按其埋深位置分成 4种古河道 ,按其充填方式又可分成 5种古河道。它们在认识地层古环境、海上施工、海上建筑和防灾减灾上有重要意义。

Through analysis of lots of core data, it is proved that the interface between No.1 marine horizon deposited since the Holocene and the underlying terrigenous horizon is a deposited in the glacial period unconformity surface (called R1) in the north central Liaodong Bay. Under the interface is layer B in which a large amount of paleo channels develop.The channels extend in the direction of NE, with a width of 20～800m and a depth of 2～13m.According to the position of layer B,they can be divided into four kinds of paleo channels, whereas according to the filling pattern, they can be divided into five. It is important to investigate their characteristics, in the aspects of our understanding of ancient environments,nautical engineering,reduction and prevention of hazards.