摘要
基于2022年采集的表层沉积物样品,通过端元分析方法,对五缘湾及同安湾口的沉积动力环境和泥沙来源进行了研究。结果表明:表层沉积物粒度端元分析提取到3个单峰端元,其中EM1端元代表了水深较浅、水动力较弱的沉积环境,可用于指示河溪入海泥沙以及随涨潮流而来的台湾海峡细颗粒物质;EM2端元代表了水动力作用较强、机械分异作用显著的沉积环境,可反映海岸风化侵蚀陆源碎屑物质;EM3端元代表了受人类活动强烈扰动作用下的沉积动力环境,指示了同安湾受高集海堤、围垦等人类活动影响发生大范围淤积之前的底砂物质。研究显示,近期高集海堤开口工程、桥梁修建、航道和港池疏浚及围填海等人类活动已对研究区域沉积环境产生了明显的扰动,被淤积物覆盖的本底砾质粗砂底质再次出露。
Based on the surface sediment samples collected in 2022,the sedimentary dynamic environment and sediment source of Wuyuan Bay and Tong′an Bay mouth were studied by end-member analysis method.The results showed that three unimodal end-members were extracted using surface sediment grain size end-member analysis.The EM1 components represented the sedimentary environment with shallow water depth and weak hydrodynamic force,which could be used to indicate the sediments entering the sea form the rivers and the fine particulate matters in the Taiwan Strait with the rising tide.EM2 components represented the sedimentary environment with strong hydrodynamic effect and significant mechanical differentiation,and could represent the terrestrial clastic materials eroded by coastal weathering.The EM3 components represented the sedimentary dynamic environment under the disturbance of stronger human activities,and represented the bottom sand material before the large-scale deposition of Tong′an Bay affected by human activities such as Gaoji seawall and reclamation.Recently,human activities such as Gaoji sea dyke opening project,bridge construction,channel and harbor dredging and reclamation had disturbed the sedimentary environment of the study area,and the gravelly coarse sand substrate had been exposed.
作者
王伟斌
姚弘毅
吴昊
蔚广鑫
WANG Weibin;YAO Hongyi;WU Hao;YU Guangxin(Fujian Institute of Oceangraphy,Xiamen 361013,China;Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies,Xiamen 361102,China)
出处
《渔业研究》
2023年第1期54-63,共10页
Journal of Fisheries Research
基金
福建省省属公益类科研院所基本科研专项(2020R1006007
2020R1006004)。
关键词
表层沉积物
粒度
端元
沉积动力
surface sediments
granularity
end-member
sedimentary dynamics
