基于声学背散射数据的南海北部东沙海域内孤立波特征研究

doi:10.11978/2025010

Study on the characteristics of internal solitary waves in Dongsha area of the northern South China Sea using acoustic backscatter data

XIONG Xin^1,2, FENG Yingci^2*, YANG Renhui³, SUN Jie², LI Jian², ZHAN Wenhuan^2,4, LV Kaiyun¹

1.School of Surveying and Geoinformation Engineering, East China University of Technology, Nanchang 330013, China;

2.CAS Key Laboratory of Ocean and Marginal Sea Geology (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 511458, China;

3.CCCC Southern China Surveying & Mapping Technology Co., Ltd., Guangzhou 510220, China;

4.University of Chinese Academy of Sciences, Beijing 100049, China

Received:2025-01-15 Revised:2025-02-12 Accepted:2025-02-21
Contact: FENG, Ying-Ci
Supported by:

National key Research and Development Program of China (2022YFC3103800); Science and Technology Projects of Guangzhou (2025A04J5494, 2023A04J0191)

Abstract

Abstract: Internal solitary waves (ISWs) are studied west of Dongsha islands in the northern South China Sea (SCS) using acoustic backscatter data in August 2021. Simultaneous satellite images and XBT profiles are incorporated to understand their propagation and evolution processes at depths 110-180 m. A comparison of acoustic backscatter images and simultaneous XBT profiles revealed that acoustic imaging provided fine water structures with a small difference above 150 m. Three soliton trains (ISW1, ISW2, and ISW3) with apparent vertical and horizontal scales of –20∼30 and -160~380 m, respectively, are captured by the acoustic section. Their propagation speeds are 1.0m·s-1 and 1.2m·s-1 and 1.5m·s-1, respectively. The observed characteristics of ISW are more consistent with those by using theoretical two-layer Korteweg-de Vries (KdV) models. ISW1 exhibits complex waveform characteristics, while ISW3 has an asymmetric waveform structure influenced by the slop topography. suggesting that strong dissipation of these two ISWs. Joint observations from high-resolution acoustic and hydrographic techniques provide a comprehensive approach to overcoming the limitations of single instrument measurements, and enhance our understanding of the complex propagation processes of ISWs in the northern SCS.

Key words: internal solitary waves, acoustic backscatter data, northern South China Sea, evolutionary process

XIONG Xin FENG Yingci YANG Renhui SUN Jie LI Jian ZHAN Wenhuan LV Kaiyun. Study on the characteristics of internal solitary waves in Dongsha area of the northern South China Sea using acoustic backscatter data[J].Journal of Tropical Oceanography, 0, (): 1-.

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Study on the characteristics of internal solitary waves in Dongsha area of the northern South China Sea using acoustic backscatter data

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