摘要
在假彩色合成图像上可以清楚地分辨出滦河下游从老到新分为(1)—(5)五个内迭三角洲,它们总的顺序是自西向东迁移。这种迁移与燕山褶皱沉降带南部一些 NNE、NE 和 NW 方向的断裂活动有关。进入全新世后,通过滦县的NNE 向断裂和顺滦河方向的 NE 向断裂相继活动,使(2)迁移到(3),然后又在(4)的位置形成新的三角洲,湖林口往西的沿岸沙坝如蛤坨、月坨和曹妃甸等都是(4)的产物,在 NE 方向的断裂活动后滦河才形成了最新三角洲(5)。因此,由于滦河三角洲不断向海淤进,使得渤海湾北部岸线的弧度越来越大。
It can be recognized rather distinctly from the false-colour composite imagrs that in the lower reaches of the Luanhe River there are five overla- pping deltas,designated in this paper as No.1 to No.5 deltas,always migra- ting eastward from the ancient time up to the present.This kind of migration iis related to the activities of the fractures in the directions of NNE,NE and NW,located at the sluthern part of the Yanshan Mountain folded zone.After entrance to the Holocene Epoch,the NNE fracture through Luanxian County as well as the NE fracture along the Luanhe River activates consecu tively, causing No.2 delta migrating to the location of No.3 and later to the loxation of No.4,thus forming new delta.The coastal sand bars west of Hulinkou,such as Getuo,Yuwtuo,Shijiutuo and Caofeidian,are all located in the area of No.4 delta.After the activities of the NE fracture,No.5 delta is formrf in the Luanhe River Mouth. Therefore,the cuvature of the coastline at the northern part of the Bo- hai Bay has gradually increased due to the constant seaward siltation of the deltas in the Luanhe River Mouth.
出处
《海岸工程》
北大核心
1989年第4期44-50,共7页
Coastal Engineering
