基于AUV观测数据的南海东沙北部浅表层精细地质特征及其灾害因素分析

doi:10.11978/2022025

Abstract

Abstract:

A comprehensive understanding of the geological characteristics of shallow strata of seabed is the basis for identifying and evaluating shallow marine geological hazards, which is of great significance to the development of marine resources and marine engineering construction. Multiple oil and gas fields are being explored and developed in northern Dongsha, South China Sea. However, there is a lack of systematic analysis of the fine geological characteristics of the shallow strata in this place. Based on the diverse data of AUV (autonomous underwater vehicle), multi-beam, AUV shallow stratum profile, 2D seismic data and sediment test, the factors of shallow strata geological hazards were identified and their risks were evaluated in the area of 100~400m water depth in northern Dongsha, South China Sea. The survey found that the seabed surface sediments in the study area were generally relatively stable, and several micro-geomorphologies of the seabed, such as sand waves, steep steps and gullies developed. Shallow gas below the seabed was not observed, and numerous paleovalleys are developed. Significant spatial differences are featured in the shape and distribution characteristics of seabed sand waves. The sand waves with wave height greater than 1m are mainly distributed in the depths of 134~143m, 168~187m and 205m, they can move positions under modern dynamic conditions. The observation results show that the development of seabed sand waves is related to the process of internal waves. The steep steps are more than 20°, which is considered to be related to the faults running through the shallow strata.

Key words: AUV, geological characteristics, geohazard factors, South China Sea, sand waves

LI Yanjie, ZHU Yousheng, CHEN Guanjun, WANG Shu, WANG Weiwei. Analysis of shallow surface fine geological characteristics and hazard factors of the seabed in the northern part of Dongsha, South China Sea based on AUV data[J].Journal of Tropical Oceanography, 2023, 42(1): 114-123.

Figures/Tables 9

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深度范围/m	280~292	230~280	205~220	187~190	168~187	151~155	143~146	134~143	131~134
波长/m	50~150	65~220	50~60	<10	50~110	<10	<10	40~130	<10
波高/m	2.3~5.1	1.3~5.1	1.3~1.5	<0.5	1.3~3.0	<0.5	<0.5	1~2.8	<0.4

Analysis of shallow surface fine geological characteristics and hazard factors of the seabed in the northern part of Dongsha, South China Sea based on AUV data

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