海南海棠湾海底微地貌多源声学特征、成因及其指示意义  

Multi-source acoustic characteristics,genesis and indicative significance of submarine micro-geomorphology in Haitang Bay,Hainan

作　　者：李勇航[1,2] 牟泽霖 刘文涛[1] 温明明[1,3] 倪玉根[1,3] 单晨晨 潘冬阳[1] LI YongHang;MU ZeLin;LIU WenTao;WEN MingMing;NI YuGen;SHAN ChenChen;PAN DongYang(Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 510760,China;School of Marine Science,Sun Yatsen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China)

机构地区：[1]中国地质调查局广州海洋地质调查局,广州510760 [2]中山大学海洋科学学院,珠海519082 [3]南方海洋科学与工程广东省实验室(广州),广州511458

出　　处：《地球物理学进展》2021年第4期1694-1701,共8页Progress in Geophysics

基　　金：国家重点研发计划项目(2017YFC0307402);中国地质调查局项目(DD20090308,DD20201175)联合资助。

摘　　要：海底微地貌不但可提供环境与工程地质评价信息,避免地质灾害发生和环境破坏,而且对渔业生态建设和沉积环境反演等也具有重要意义.为揭示海底微地貌的多源声学特征,成因及指示意义,利用在海南海棠湾获取的侧扫声呐、浅地层剖面、单道地震数据进行分析.识别出海底沙斑、小沙波、沙纹、礁石堆、基岩等自然微地貌,以及海底拖痕、管道、人工鱼礁、养殖网箱等人工微地貌.证实海底微地貌多源声学识别方法具有综合立体探测的优势,解译可靠性高;全新世以来,研究区如沙斑、小沙波、沙纹等自然微地貌,主要受较弱的水动力条件和沉积物供应不足制约,而人工微地貌主要由人类海洋活动造成,具体表现在基于人工鱼礁投放的海洋牧场建设、海洋养殖、拖网捕鱼以及海底管线敷设等方面;研究区地质条件总体良好,发生地质灾害风险小.Submarine micro-geomorphology can not only provide the information of environmental and engineering geological evaluation, which can avoid geological disasters and environmental damage, but also have important significance to fishery ecological construction and sedimentary environment inversion. In order to reveal the multi-source acoustic characteristics, genesis, and indicator significance of submarine micro-geomorphology, the side-scan sonar, sub-bottom profile, and single-channel seismic data obtained in Haitang Bay, Hainan Island was used for analysis. The natural micro-geomorphology, such as sand patches, sand waves, sand ripples, reefs, and bedrock, as well as anthropogenic micro-geomorphology, such as seabed trawling marks, pipelines, artificial reefs, and culture cage, can be identified. It is proved that the multi-source acoustic identification method for submarine micro-geomorphology has the advantages of comprehensive stereo detection and high reliability of interpretation. Since the Holocene, natural micro-geomorphology in the study area, such as sand patches, small sand waves, sand ripples, mainly by the weak hydrodynamic conditions and sediment supply constraints. Anthropogenic micro-geomorphology is mainly caused by human marine activities, which is embodied in marine ranching construction based on artificial reef release, marine aquaculture, trawling, submarine pipeline laying, and so on. The geological conditions in the study area are generally good, with small-scale sedimentary geomorphology causing less risk of geological disasters, and no large sand waves, sand ridges, shallow gas, faults, landslides, and other geological hazards.

关 键 词：海底沙波 海洋牧场 人工鱼礁 人工地貌 海底地貌 地质灾害 侧扫声呐 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]