海洋地质与第四纪地质2023，Vol.43Issue(6)：14-24,11.DOI:10.16562/j.cnki.0256-1492.2023082302
闽江口琅岐岛潮滩沉积物粒度时空变化特征研究
Spatio-temporal variations in grain size of surficial sediment on tidal flat of Langqi Island in Minjiang River estuary
摘要
Abstract
Tidal flats are located in sensitive areas of interaction between land and ocean,and their sedimentary environment changes are closely related to the evolution of coastal ecosystems and coastal development and utilization.In order to clearly understand the spatio-temporal variations of estuarine tidal flats,we selected the tidal flat of Langqi Island in the Minjiang River estuary as the study area,studied surficial sediment composition in different seasons,and discussed the spatio-temporal variations in sediment grain size distribution,providing a scientific basis for a deep understanding of the sedimentary process of the estuarine tidal flats in response to environmental changes.Results indicate that the surficial sediment composition of inter-tidal flat on Langqi Island is dominated by silt,with significant differences of sand and clay contents.The mean grain-size ranges from 2.2 Φ to 7.4 Φ,and shows a significant seasonal variations,with the average mean grain-size in summer being smaller than in winter.From west to east,the mean grain-size increases first and then decreases seaward,and the distribution area of coarse grain component in gradually increases from north to south.The distribution pattern of sediment on the inter-tidal flat of Langqi Island at the Minjiang River estuary is consistent with that of other estuaries,bays,and open tidal flats in the world,reflecting the result of the among sediment sources,hydrodynamics,and local geomorphology.However,due to significant differences in hydrodynamics,vegetation coverage and sediment supply in the study area,which cause significant seasonal changes in the sediment composition,the sediment grain-size compsition of the tidal flat in the Minjiang River estuary are very sensitive to environmental changes.关键词
粒度参数/季节变化/潮滩/琅岐岛/闽江口Key words
grain-size parameter/seasonal variation/tidal flat/Langqi Island/Minjiang River estuary分类
海洋科学引用本文复制引用
李海琪,王爱军,叶翔,梁灏深,张望泽,吴水兰,李云海..闽江口琅岐岛潮滩沉积物粒度时空变化特征研究[J].海洋地质与第四纪地质,2023,43(6):14-24,11.基金项目
国家自然科学基金项目"闽江河口-毗邻海岸的地貌沉积互馈过程及环境演变"(U22A20585),"中小型山溪性河口水下三角洲沉积体系演化及其对人类活动与极端事件的响应"(41776099) （U22A20585）
自然资源部第三海洋研究所科研业务费专项资金资助项目(海三科2019017,海三科2019018) （海三科2019017,海三科2019018）
