Preliminary study on the depositional model in the wavedominated delta evolution during the Anthropocene:a case study of the Hanjiang River Delta in China  

作　　者：Hongyue Wang Zhongbo Wang Yang Wang Haiyan Tang Xiaodong Zhang Xiaofeng Luo Yongxin Mai Xuhong Huang Yilin Zheng Ping Yin Zhongping Lai 

机构地区：[1]Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention,Institute of Marine Sciences,Shantou University,Shantou 515063,China [2]Zhoushan Field Scientific Observation and Research Station for Marine Geo-hazards,China Geological Survey,Zhoushan 316000,China [3]Laboratory for Marine Mineral Resources,Laoshan Laboratory,Qingdao 266237,China [4]Haikou Marine Geological Survey Center,China Geological Survey,Haikou 570100,China [5]College of Marine Geosciences,Ocean University of China,Qingdao 266100,China [6]Qingdao Institute of Marine Geology,Qingdao 266237,China

出　　处：《Acta Oceanologica Sinica》2024年第11期45-56,共12页海洋学报(英文版)

基　　金：The Guangdong Basic and Applied Basic Research Foundation under contract Nos 2024A1515012628;the National Natural Science Foundation of China under contract Nos 41876059 and 42372213;the Open Research Fund Program of Zhoushan Field Scientific Observation and Research Station for Marine Geo-hazards,China Geological Survey under contract No.ZSORS-22-5;the Shantou University Scientific Research Foundation for Talents under contract No.NTF20028;China-Association of Southeast Asian Nations(ASEAN)Maritime Cooperation Fund Project under contract No.12120100500017001;China Geological Survey Projects under contract Nos DD20211553,DD20221710,and DD20230415;the Science and Technology Innovation Fund of Command Center of Integrated Natural Resources Survey Center under contract No.KC20230017.

摘　　要：The deltas serve as the primary interactive zone where terrestrial and marine environments converge,playing a pivotal role in the coastal deposition.In the Holocene,climate changes and sea level fluctuation are the principal driving factors in the evolution of deltas.However,human activities such as the construction of dams and reservoirs in the Anthropocene have significantly altered sediment transport in rivers,leading to depositional pattern variation during deltaic evolution.In this study,we have conducted a comparative analysis of the morphological variations(1986-2021)in the barrier system of the Hanjiang River Delta(HRD)using satellite remote sensing(SRS)method.Additionally,we have examined the lithological changes and facies alterations observed in eight boreholes on the present barrier spit.Our findings indicate that the intensification of anthropogenic activities led to a significant reduction in the sediment flux of the Hanjiang River(HR),resulting in depocenter landward migration at the estuary.SRS analysis reveals their periodical morphological characteristics and spatial variations of estuarine sandbars(1986-1992),barrier islands-lagoons(1993-2009),and barrier spits(2010-2021)during 1986 to 2021.The stratigraphy of boreholes demonstrates a south-to-north facies transition from lagoon to lagoon-barrier spit and barrier spit in vertical lithology.Therefore,the depositional evolution of the HRD barrier system is categorized into three phases:estuarine sandbar-barrier island phase(1986-1998);barrier island-lagoon phase(1999-2009);and barrier spit phase(2010-2021).During the estuarine sandbar-barrier island phase,fluvial processes played a predominate role in the deposition.Consequently,with a significant decrease in river sediment load,the dominant factors driving depositional processes shifted towards wave action and alongshore current.Based on the conceptual model in the Holocene,we propose a modified depositional model of wave-dominated deltas during Anthropocene that encompasses three evolutionary p

关 键 词：Hanjiang River Delta barrier spit human activities wave-dominated delta depositional model 

分 类 号：P53[天文地球—古生物学与地层学]