沉积学报2024，Vol.42Issue(2)：558-574,17.DOI:10.14027/j.issn.1000-0550.2022.058
闽江河口水下三角洲及周边海域现代沉积环境演化及其对人类活动的响应
Contemporary Sedimentary Environment Evolution and Its Response to Human Activities in the Minjiang Subaqueous Delta and Surrounding Waters
摘要
Abstract
[Objective]River deltas are sensitive areas of land-sea interaction with intense human activities,and continue to be the focus of international research.[Methods]Based on grain-size analysis of surface sediments in the Minjiang River delta and surrounding waters,this study discusses the evolution of the contemporary sedimentary envi-ronment in the area.[Results]It is shown that the dominant to-and-fro tidal current within the estuary gradually changes into a rotating seaward flow,and that the current speed decreases from the subaqueous delta to the offshore area.The sediments in the study area are mainly sand,silt and sandy silt,with mean grain-sizes of 1.57 Φ,6.7 Φ and 5.62 Φ.From the estuary to the adjacent coastal shelf area,coarse-particle content decreases and fine-particle con-tent gradually increases.In addition,grain size trend analysis indicates that the sediment delivered by the Minjiang River is transported towards the E,SE and NE when it enters the estuary.After the fine sediment passes through the subaqueous delta,it tends to be transported offshore towards the SE and NE.A multivariate statistical analysis of sed-iment composition,grain size parameters and water depth integrating the geographical location,sediment source and hydrodynamic conditions indicate that the contemporary sedimentary environment in the study area is divided into four sub-sedimentary districts.The study reveals the effect of different influences on the sedimentary environment and demonstrates its response to human activities.[Conclusions]The results of this study provide advice for estuary resource development and ecological environment protection.关键词
水下三角洲/闽江河口/粒度参数/沉积物输运趋势/沉积环境Key words
subaqueous delta/Minjiang River estuary/grain-size parameter/sediment transport trend/sedimentary environment分类
海洋科学引用本文复制引用
谢津剑,王爱军,叶翔,陶舒琴,蔡枫..闽江河口水下三角洲及周边海域现代沉积环境演化及其对人类活动的响应[J].沉积学报,2024,42(2):558-574,17.基金项目
国家自然科学基金项目(UZZA20585,41776099) （UZZA20585,41776099）
自然资源部第三海洋研究所基本科研业务费项目(海三科2017015,海三科2019018) National Natural Science Foundation of China,No.UZZA20585,41776099 （海三科2017015,海三科2019018）
Scientific Research Foundation of the Third Institute of Oceanography,MNR,China,No.2017015,2019018 （）
