福建东山八尺门海域现代沉积物分布特征及其冲淤演化过程  

Modern sediment distribution and evolution of seabed erosion and deposition in Bachimen sea area,Dongshan,Fujian

作　　者：游远新[1] YOU Yuanxin(Fisheries Research Institute of Fujian,Xiamen 361013,China)

机构地区：[1]福建省水产研究所,福建厦门361013

出　　处：《渔业研究》2022年第1期9-20,共12页Journal of Fisheries Research

基　　金：福建省省属公益类科研院所科技服务项目(20180400104).

摘　　要：本文通过对八尺门海堤两侧海域表层沉积物和柱状沉积物的分析、不同时期的海图和实测水深数据对比,对八尺门海堤两侧海域沉积环境及冲淤变化进行了分析。研究结果表明:八尺门海域表层沉积物以黏土质粉砂为主,沉积物类型趋于单一;柱状沉积物^(210)Pb活度未呈指数型下降,表明沉积物受到扰动影响,沉积速率表明八尺门海堤两侧海域的沉积速率随时间呈逐渐增大的趋势;八尺门海域总体上为淤积状态,冲淤变化的原因主要为八尺门海堤对东山湾和诏安湾之间水体交换的阻隔,养殖网箱、吊养设施和养殖池塘对海流的阻碍,养殖过程中流失和残余的饵料及养殖生物的代谢物等。Based on the analysis of surface sediments and columnar sediments from both sides of Bachimen seawall,and the comparison of water depth data in different periods,this paper analyzes the sedimentary environment and the changes of seabed erosion as well as deposition on both sides of Bachimen seawall.The results showed that the surface sediment types in Bachimen sea area were mainly clayey silt,and the sediment type tends to be single.The ^(210)Pb of columnar sediments did not decrease exponentially,indicating that the sediments were disturbed.The deposition rate showed that the deposition rate in the sea areas on both sides of Bachimen seawall gradually increased with time.The sea area was generally in the state of deposition.The main reasons for the change of erosion and deposition were the barrier of Bachimen seawall to the exchange of sea water between Dongshan Bay and Zhao'an Bay,the barrier of aquaculture cage,hanging aquaculture facilities and aquaculture pond to the sea current,the loss and residual bait as well as metabolites of aquaculture organisms in aquaculture,etc.

关 键 词：沉积环境 冲淤变化 水深数据对比 沉积物粒度 ^(210)Pb测年 人类活动 

分 类 号：P736.21[天文地球—海洋地质]