厦门湾及邻近海域沉积物分布特征和沉积速率  

Sediment distribution and deposition rate in the Xiamen Bay and adjoining waters

作　　者：刘治帅[1] 杨旸[1] 陈坚[2] 王爱军[2] 李东义[2] 汪亚平[3] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,江苏南京210093 [2]国家海洋局第三海洋研究所,福建厦门361005 [3]南京大学江苏省海岸与海岛开发重点实验室,江苏南京210093

出　　处：《海洋科学》2012年第6期1-8,共8页Marine Sciences

基　　金：国家自然科学基金项目(40876043;40906042);江苏高校优势学科建设工程资助项目

摘　　要：2007年和2010年在厦门湾及邻近海域进行底质表层沉积物和柱状岩心样品采集，并进行粒度分析及粒度参数计算，获得了研究区底质表层和柱状沉积物样品的粒度分布特征。结果表明，厦门湾海域沉积物类型多样，以粉砂质砂和砂质粉砂为主。平均粒径介于-1．5Φ～7．5Φ之间。采用Gao—Collins粒径趋势分析方法，发现九龙江口的沉积物主要呈东南方向净输运，而大金门南侧海域沉积物则有向九龙江口输运的趋势，同安湾内沉积物由海岸向湾中央输运；厦门东部海域沉积物向北输运，翔安南部海域沉积物向同安湾口以及澳头近岸输移。对柱状岩心进行放射性同位素210Pb测年分析，计算得到九龙江1：2沉积速率为2．62crn／a，进而探讨了九龙江口的沉积环境演化特征，研究成果可为区域资源开发和环境保护提供科学依据。The bottom, surficial, and core sediments were collected from the Xiamen Bay and adjoining waters in 2007 and 2010. The sediments were analyzed to obtain the particle sizes distribution and parameters. The analysis showed that the contents of sediments varied, mainly including silty sand and sandy silt. The mean particle size was -1.5Φ - 7.5Φ. The Gao-Collins grain size trend model was applied to estimate the net sediment transport pathways in the investigation areas. The sediment transported southeastward in the Jiulong River Estuary, and towards this estuary from Dajinmen area. In addition, the sediment transported offshore to the central bay in Tonganwan area. The sediment transported towards north in the eastern Xiamen sea, and towards the mouth of Tonganwan and on- shore of Aotou. The sediment core was analyzed using the 210pb dating method. The deposition rate was 2.62 cm / a in the Jiulong River Estuary. The above results and conclusions could be utilized in regional resource exploitation and environmental protection.

关 键 词：厦门湾 沉积物 粒度特征 粒径趋势分析 沉积速率 

分 类 号：P734[天文地球—海洋化学]