摘要
海岸堆积体的研究是海岸地貌学的主要研究课题之一。近二十年来,对砂质海岸堆积地貌及其相应的沉积相的研究进展很快。一些地质研究者对北美和大洋洲的许多典型海岸的观测和研究获得了良好的成果,对黑海和里海也做过一些工作。砂质海岸堆积体的,研究,过去偏重于沙坝、沙咀、沙堤等,而且多注重于陆上部分。
Diaolongzui lies in the center of eastern coast of the Laizhou Bay.In the coastal plain there is an old coastline.They are many date revealing this old coastline:1.The 5 m isometric line is a continuous,distinctive cliff,with a relative height of 1-2 meters;2.Over the cliff is a slight slop consisting of a Q_(3)^(dpl)yellow stratum.On the Q_(3)^(dpl)slop,neither feature of marine erosion nor tract of marine accumulation is showing;3.Below the old cliff is a Q_(4)^(m) mixture of sands,conchs and muds.Conditions under which the multi-accumulation spits were formed are as follows:A great bulk of the sands supplied from the Wanghe river,some supplied from the eastern coast of the Laizhou Bay,and the carrying by the wave and longshore current to the southwest.Accumulational forms ①-⑨ are developed in sequence.Behind each form there is a lagoon or marsh.After form ⑥ was developed,form@undergoes a process of retreat from ④ to ⑤.On the formation of small barrier inland we favered Hoyts hypothesis that the small barrier island may be formed by spit growth across a lagoon and subsequent truncation of the spit during storms.For examples:a.Form ⑧ was truncated by storm into a small inlet and island forty two years ago;b.The smallest spit ⑦ was truncated into a smallest inlet and island in February,1979 by a strong northern wind.
作者
蔡爱智
Cai Aizhi(Institute of Oceanology,Academia Sinica)
出处
《海洋与湖沼》
1980年第3期204-210,共7页
Oceanologia Et Limnologia Sinica
