| 摘要: |
| 我们于1975年对台湾海峡南部进行海底地形和底质调查研究时发现:1.台湾浅滩发育着水下沙丘群。2.陆架地形受现代环境的作用,正经历着冲刷、侵蚀和堆积的再改造过程。3.陆架边缘曾发生了巨大的滑坡。其原因是陆源物质供应严重缺乏,在风浪和各种流系作用下,使沉积物不断进行分异作用,再加上自1938年以来多次发生5—7级海底地震而导致滑坡,滑坡又促使沉积物向深水搬运,加速陆架地形的冲刷。 |
| 关键词: |
| DOI： |
| 分类号: |
| 基金项目: |
|
| SOME DISCOVERIES OF SUBMARINE RELIEF IN THE SOUTHOF TAIWAN STRAIT |
|
|
| Abstract: |
| Investigation on the submarine relief and bottom sediments was made in the south of Taiwan Strait in 1975. Following results were obtained: 1. Many submarine dunes are developing on the Taiwan shallow bank. 2. The shelf feature is undergoing a reforming process by washing, erosion and accumulation. 3. Slides have been happening in a large scale on the shelf margin. Under the actions of the strong southwest wind and northeast wind, the Kuroshio the monsoon current and the lack of continental material supply, sediments are continuously undergoing differentiation, resulting in the accumulation of sediments on the middle north of Taiwan shallow bank and the washing on its both sides. As the washing is stronger than the accumulating, the sediment has a deficit and the grain size decreases from the middle of Taiwan shallow bank to the sides (Fig. 3). On the action of waves, a lot of submarine dunes have developed (Fig. 2). In addition to dynamic water condition the submarine earthquakes which have occurred several times of magnitude 5-7 sine 1938 may be the direct cause leading to the slides at the shelf margin. Slides bring sediments to deepwater region and speed up the erosion of the shelf. In a word, the relief and the bottom sediment are undergoing a process under the internal and the outer stresses. |
| Key words: |
