华东地质2023，Vol.44Issue(4)：402-414,13.DOI:10.16788/j.hddz.32-1865/P.2023.04.004
莱州湾海洋沉积物粒度特征及其环境响应分析
Grain size characteristics and environmental response of marine sediments in Laizhou Bay
摘要
Abstract
This paper studied the 1～3 m thick sedimentary environment in the Laizhou Bay based on the grain size information of 20 core samples.Sand and silty sand are the main components of the sedi-ments in Laizhou Bay,and their sorting degree is poor on the whole,indicating significant influence on the formation of the sediments exerted by surrounding factors.The grain size characteristics of the sediments in Laizhou Bay obviously reflect the environment.The distribution of grain size in cores indicate different stages of forces acting on the sediments in different sea areas.In general,from the coast of Laizhou Bay to the plain under middle shallow sea,the slope of the probability accumulation curve increases gradually and the periodic differentiation becomes more and more distinct.The environmentally sensitive component of Laizhou Bay sediment is 3 ≤φ≤4,and coastal river properties and sediment transport path have significant effects on grain size and components.Combined with the previous research on sedimentation rate,the peri-odic changes of grain size and components in the eastern area of Laizhou Bay is temporally corresponding to the diversion of the Yellow River in 1855.The sedimentary environment in the middle sea area of Laizhou Bay has strong hydrodynamics and diverse material sources.The grain size of sediments in Qimudao-Dia-olongzui sea area is slightly coarse,requiring a higher critical starting speed and a relatively small probabil-ity of resuspension.The Yellow River submerged delta is relatively turbulent with unstable energy.It is in the late stage of gravity flow,with energy attenuation and conversion to traction and drainage.The under-water bank slope in the southern Bay has a certain amount of sedimentation under the action of waves and tidal currents.关键词
莱州湾/浅海/沉积粒度/沉积环境Key words
Laizhou Bay/shallow sea/grain size of sediments/sedimentary environment分类
海洋科学引用本文复制引用
黄学勇,高茂生,侯国华,张戈,党显璋..莱州湾海洋沉积物粒度特征及其环境响应分析[J].华东地质,2023,44(4):402-414,13.基金项目
国家自然科学基金"晚更新世以来莱州湾地下卤水成因及恢复性研究(编号:41977173)"、科技基础性工作专项"我国典型潮间带沉积物质量本底调查及图集编研(编号:2014FY210600)"、国家重点研发专项"沿海地区海水入侵现状调查评价(编号:2016YFC0402801)"和中国地质调查局"渤海湾西部等重点海岸带综合地质调查(编号:DD20160144)"项目联合资助. （编号:41977173）
