摘要
对渤海湾曹妃甸海域161个表层沉积物样品进行了粒度组分和参数分析,利用Pejrup三角投图进行沉积动力环境分区,并运用GAO-COLLINS模型模拟沉积物输运趋势。结果显示,研究区表层沉积物类型包括砂、粉砂质砂、泥质砂、砂质粉砂、粉砂和黏土。粉砂分布范围最广,其次为粉砂质砂。粒度从东北向西南由粗变细,分选性逐渐变好。研究区东、西方向各有一个沉积中心,且二者沉积物输运趋势差异明显。东部海域沉积中心表现为北侧离岸输运,南侧向近岸输运,西侧向东输运;西部海域沉积中心表现为向西南、向西和向北输运。物源、地形地貌和水动力条件是物质输运的主要控制因素。结合周边工程环境因素、海底地形地貌、海流和地质背景等信息,在Pejrup三角图上,研究区沉积动力环境可划分成3个区,各区沉积动力强度与沉积物类型分布具有较好的对应关系。研究区物质运输主要受潮流、波浪和渤海湾环流控制。本研究揭示了曹妃甸南部海域现代沉积特征和水动力特征,可为曹妃甸围海造陆后海域沉积环境变化研究提供基础资料。
A total of 161 surface sediment samples were collected in the Caofeidian sea area of Bohai Bay and classified,the grain size fractions and parameters were analyzed,the depositional dynamic environments were partitioned using Pejrup's triangular projection map.The Gao-Collins model was used to simulate sediment transport trends.Results indicate that the surface sediments in the study area included sand,silty sand,sandy mud,muddy sand,silt,and clay,of which silt was the most widely distributed,followed by silty sand.The grain size showed a gradient from coarser to finer from northeast to southwest with increased sorting.Two distinct depositional centers were recognized,each with unique sediment transport patterns.The eastern center showed offshore transport in the northern side and onshore transport in the southern side,while the western center exhibited transport to the southwest,west,and north.The material source,topography,and hydrodynamic conditions were the primary factors controlling the materials transport.The depositional dynamic environment in the study area could be divided into three zones on the Pejrup triangle diagram according to the surrounding engineering environmental factors,seabed topography,ocean current and geological background.Material transport was primarily governed by tidal currents,waves,and the Bohai Bay circulation.This study unveiled the modern sedimentary and hydrodynamic characteristics in the southern Caofeidian area,and provided foundational data for research into the changes in the depositional environment after land reclamation in the area.
作者
冯永财
郝连成
胡延斌
褚宏宪
李佳林
远继东
黄杏
陈晓日
王超
FENG Yongcai;HAO Liancheng;HU Yanbin;CHU Hongxian;LI Jialin;YUAN Jidong;HUANG Xing;CHEN Xiaori;WANG Chao(Yantai Center of Coastal Zone Geological Survey,China Geological Survey,Yantai 264000,China;Ministry of Natural Resources Observation and Research Station of Land-Sea Interaction Field in the Yellow River Estuary,Yantai 264000,China)
出处
《海洋地质前沿》
CSCD
北大核心
2024年第11期57-69,共13页
Marine Geology Frontiers
基金
中国地质调查局项目(DD20211553,DD20230073,DD20230412)
国家自然科学基金(41276060)
自然资源综合调查指挥中心科技创新基金(KC20220011)。
关键词
曹妃甸
表层沉积物
粒度参数
沉积动力环境
沉积物输运趋势
Caofeidian
surface sediment
grain size parameters
depositional dynamics environment
sediment transport trend
