广西钦州湾海域表层沉积物分异特征与规律  

Sediment characteristics and differentiation in the Qinzhou Bay, Guangxi, China

作　　者：张伯虎[1,2] 陈沈良[1] 刘焱雄[3] 谷国传[1] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062 [2]浙江省水利河口研究院,浙江杭州310020 [3]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《热带海洋学报》2011年第4期66-70,共5页Journal of Tropical Oceanography

基　　金：广西近海海洋综合调查与评价专项(GX908-01-08)

摘　　要：根据2008年12月广西钦州湾海域表层沉积物粒度分析结果,结合沉积物结构、地形和水动力条件,探讨了沉积物的分布规律及其作用机制。结果表明,钦州湾海域表层沉积物在横向上,自西向东呈现出西部粗、东部细,分选程度西部好于东部的特征;在纵向上,沉积物粒径呈现由内向外粒径从粗到细的特征,大致在5m水深处存在一个明显的界限,该水深以浅区域的砂含量较高,且主要沉积砂等较粗物质;该水深以深区域以粉砂质黏土为主,砂含量较低。Flemming的三角图式表明,钦州湾海域沉积动力相对较弱。在此基础上,根据水动力差异与物源不同,将研究区划分为5m水深以浅的西部区、5m水深以浅的东部区和5m水深以深的区域等3个沉积区。The authors investigated the sedimentary environments and their hydrodynamic processes in the Qinzhou Bay, based on the data of surface sediment samples collected in 2008 in combination with sediment texture, topography, and hydrodynamics of the bay. The results indicate that transversal distributions of surface sediments in the outer bay are from coarse to fine particle size, and the degree of the sort is from good to poor level. For the longitudinal distribution of surface sediments, there is a large percentage of sand at the underwater slope that is shallower than 5 m; however, slit and clay predominate at the underwater slope that is deeper than 5 m. According to the differences in hydrodynamic, morphologic features, and sediment sources, the outer bay can be divided into three main sedimentary zones.

关 键 词：沉积物粒度 水动力 沉积分区 钦州湾 

分 类 号：P736.2[天文地球—海洋地质]