耿明会^1,,
宋海斌^1,,,
关永贤²,
陈军¹
1. 海洋地质国家重点实验室, 同济大学海洋与地球科学学院, 上海 200092
2. 国土资源部海底矿产资源重点实验室, 中国地质调查局广州海洋地质调查局, 广州 510760

基金项目: 国家重点研发计划项目（2017YFC0306703）、国家自然科学基金（41576047，41506054）与国家自然科学基金重大计划重点项目（91128205）资助


详细信息

作者简介: 耿明会, 女, 1990年生, 山东临沂人, 主要从事海洋地球物理研究.E-mail:gengminghui5591788@163.com

通讯作者: 宋海斌, 教授, 主要从事海洋地球物理与地震海洋学研究.E-mail:hbsong@tongji.edu.cn

中图分类号: P738

收稿日期:2017-10-23
修回日期:2018-01-11
上线日期:2018-02-05

Research on the distribution and characteristics of the nepheloid layers in the northern South China Sea by use of seismic oceanography method

GENG MingHui^1,,
SONG HaiBin^1,,,
GUAN YongXian²,
CHEN Jun¹
1. State Key Laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
2. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China


More Information

Corresponding author: SONG HaiBin,E-mail:hbsong@tongji.edu.cn

MSC: P738

--> Received Date: 23 October 2017
Revised Date: 11 January 2018
Available Online: 05 February 2018


摘要
摘要:利用地震海洋学方法在南海北部陆架和上陆坡区域发现了15个雾状层.这些雾状层的延伸长度从几千米到几十千米，厚度十几米到一百米，其顶界所处水深在135 m至715.5 m范围之间.雾状层在地震海洋学剖面上表现为强反射特征.不同于其他传统声学或光学方法，地震海洋学方法分辨率高，且能在短时间内对整个水体进行成像，可以记录到雾状层的时空变化特征，实现对雾状层的"四维"观测.南海北部上陆坡区域是内孤立波浅化、能量耗散集中的区域，在此过程中内孤立波会导致较大的波致流速，侵蚀海底使得表面沉积物再悬浮，进入水体，形成和维持雾状层的存在.
关键词: 雾状层/
地震海洋学/
内孤立波/
沉积物再悬浮/
南海北部

Abstract:In the northern South China Sea, we totally find 15 nepheloid layers on the shelf and upper continental slope by seismic oceanography method. These nepheloid layers range in length from several kilometers to tens of kilometers, in thickness between more than ten meters and one hundred meters, and the top boundaries of which occur from 135 m to 751.5 m deep. The nepheloid layers are indicated by enhanced reflections on the seismic oceanography profiles. Compared to the traditional acoustic and optical methods, the seismic oceanography method can map the whole water-column structure of the ocean in a very short period of time, with high resolution, could capture the nepheloid layers' variations in temporal and spatial domain, and realize their four-dimensional observations. The upper continental slope of northern South China Sea is the focus area of the internal solitary wave shoaling and energy dissipation, and the propagation and shoaling of the internal solitary wave bring about quite large wave-induced current, which will erode the seafloor and resuspend sediment particles to generate and maintain these nepheloid layers.
Key words:Nepheloid layers/
Seismic oceanography method/
Internal solitary waves/
Sediment resuspention/
Northern South China Sea



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