海南三亚海域沉积物分布特征及其沉积环境指示  

Distribution characteristics of sediments and indication significance of sedimentary environment in the Sanya area,Hainan Province

作　　者：张亮 刘文涛[1,2] 贾磊 夏真[1,2] 胡梦茜 崔振昂 ZHANG Liang;LIU Wentao;JIA Lei;XIA Zhen;HU Mengxi;CUI Zhen’ang(Key Laboratory of Marine Mineral Resource,Ministry of Natural Resources,Guangzhou 510760,Guangdong,China;Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 510760,Guangdong,China)

机构地区：[1]自然资源部海底矿产资源重点实验室,广东广州510760 [2]中国地质调查局广州海洋地质调查局,广东广州510760

出　　处：《地质通报》2021年第2期341-349,共9页Geological Bulletin of China

基　　金：中国地质调查局项目《海南岛东北部沿海综合地质调查》(编号:DD20190308)。

摘　　要：2015—2016年开展1∶5万三亚海岸带综合地质调查,在三亚近岸海域采集328站位表层沉积物、完成5站位定点海流观测,获取了三亚海域表层沉积物粒度分布特征和水动力特征,并研究其指示的沉积环境。结果表明,研究区沉积物类型主要是粘土质粉砂、砂、砂质粉砂、砾石质砂、粉砂和粉砂质砂,其中粘土质粉砂是最主要沉积物类型,平均粒径为0.22~7.37φ。沉积物输运趋势显示,沿岸不同岸段出现侵蚀淤积趋势,东西瑁洲岛离岸输运,研究区南部存在多个沉积中心。海流结果表明,研究区属往复流,涨潮方向为西北向,落潮方向为东南向,余流方向主要为东南向。对水深、沉积物粒度参数进行了主成分分析和聚类分析,综合考虑水动力、物源和地形因素及其相互作用,将研究区划分为3类沉积环境。这种划分方法能揭示不同控制因素下的沉积环境差异,研究结果可为三亚海域生态环境保护、海洋工程建设提供科学依据。In order to obtain the grain size distribution characteristics and hydrodynamics of surface sediments in Sanya area and to study the indicative significance of sedimentary environment,a total of 328 surface sediments samples were collected and five fixed-point ocean current observations were completed in the coastal waters of Sanya during the 1∶50000 comprehensive geological survey in this area from 2015 to 2016.The results show that the types of sediments in the study area are mainly clayey silty sand,sand,sandy silty sand,gravelly sand,silty sand and silty sand,with the mean size 0.22 ~ 7.37φ,among which clayey silty sand is the most important.The grain size transport trend indicates that there are an erosion-deposition trend in some sectors along the coastline,offshore transport of the Maozhou island and multiple deposition centers in the south of the study area. The results show that there exists a reciprocating current in the study area,the direction of high tide is northwest,the direction of ebb tide is southeast,and the direction of residual current is southeast. Based on the principal component analysis and cluster analysis,according to the hydrodynamic,provenance and topographic factors as well as their interactions,the study area is divided into three types of sedimentary environments.This division way can reveal the difference in the sedimentary environments under different controlling factors. The results of the study can provide a scientific basis for ecological environmental protection and marine engineering construction in Sanya.

关 键 词：沉积物 粒度 水动力 输运趋势 聚类 海南三亚 

分 类 号：P736.21[天文地球—海洋地质] P5[天文地球—海洋科学]