烟台北部近岸海域表层沉积物粒度分布及沉积动力环境特征  

GRAIN SIZE DISTRIBUTION PATTERN OF SURFACE SEDIMENTS IN THE NORTHERN YANTAI COASTAL WATERS AND ITS BEARING ON HYDRODYNAMIC ENVIRONMENT

作　　者：吕纪轩 胡日军[1,2] 李毅 朱龙海[1,2] 刘波 皇甫雪睿 LYU Jixuan;HU Rijun;LI Yi;ZHU Longhai;LIU Bo;HUANGFU Xuerui(College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao 266100,China;Huaneng Xiapu Nuclear Power Co.,Ltd.,Ningde 352000,Zhejiang,China)

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266100 [2]中国海洋大学海底科学与探测技术教育部重点实验室,青岛266100 [3]华能霞浦核电有限公司,福建宁德352000

出　　处：《海洋地质前沿》2020年第4期27-36,共10页Marine Geology Frontiers

基　　金：国家自然科学基金面上项目“山东半岛海湾对泥沙的捕获机制——以威海湾为例”(41776059)。

摘　　要：基于烟台北部近岸海域56个表层沉积物样品的粒度资料,分析了研究区沉积物粒度分布特征。采用Pejrup三角图对研究区沉积动力环境进行了分区,利用Gao-Collins粒径趋势分析方法分析了沉积物的输运趋势,在此基础上探讨了研究区的沉积动力环境特征。研究结果表明,研究区粒度呈现中间粗、东西部海域细的分布格局;沉积动力环境可划分为AⅢ、BⅢ、BⅣ、CⅢ、CⅣ、DⅢ、DⅣ7个区,总体表现为"中间强、两侧弱,近岸强、远岸弱"的分布格局;研究区东西部开阔海域各存在1个沉积物汇聚中心,物质来源多样;研究区表层沉积物运移和分布与水动力条件基本吻合,且受沉积物来源的影响。潮流、沿岸流以及沉积物来源共同控制其沉积动力环境。Based on the 56 surface sediment samples collected from the northern Yantai coastal waters, the grain size distribution pattern of the sediments was analyzed. The sedimentary dynamic environment of the study area was defined by the Pejrup triangle diagram, and the transport trend of the sediments revealed by the Gao-Collins grain size trend analysis method. On this basis, the characteristics of the sedimentary dynamic environment of the study area were discussed. Results show that the grain size distribution of the study area is characterized by a pattern with coarse sediments in the center surrounded by fine deposits in the east and west;and thus the study area can be divided into seven sedimentary dynamic environments areas: AⅢ, BⅢ, BⅣ, CⅢ, CⅣ, DⅢ and DⅣ. Dynamically, strong environment occurs in the center, weak environments on both sides, or strong near shore and weak far shore;Two depositional centers are discovered in the open sea areas of the eastern and western parts of the study area, and the sediment sources are rather diverse;The movement and distribution of surface sediments in the area are basically dependent upon hydrodynamic conditions, influenced by sediment sources. And the sedimentary dynamic environment is jointly determined by tidal currents, coastal currents and sediment sources.

关 键 词：烟台北部 表层沉积物 粒度 分布特征 沉积动力环境 

分 类 号：P736.21[天文地球—海洋地质]