鸭绿江口与邻近西海岸沉积记录的耦合

发布时间：2018-04-04 09:37

本文选题：沉积记录　切入点：鸭绿江口　出处：《海洋学报》2017年01期

【摘要】：通过对采自鸭绿江口主汊道的5个柱状样的~(210)Pb和~(137)Cs测年以及粒度参数的分析,并与前期合作研究的西汊道及西岸潮滩的4个柱状样沉积物的测年和粒度研究成果进行比对,探讨了流域来水来沙、河口沉积与海岸发育之间的耦合效应及鸭绿江河口地貌演化的新证据。结果表明:鸭绿江口主汊道存在河流和潮流两种沉积作用,不同时期动力作用不同;以潮流作用为主的沉积时段,其沉积特征与西汊道及西岸潮滩的一致;主汊道沉积物的物质来源与西汊道和西岸潮滩的物质来源存在差异。鸭绿江口的主汊道、西汊道及邻近海岸的沉积记录对环境变化、人类活动、流域大洪水等事件均存在响应,响应的时间基本同步,具有耦合效应。沉积记录中存在5个明显的"事件信号",其中1960年最为重要,是鸭绿江河口地貌发生巨变的时间。
[Abstract]:The dating and granularity parameters of five columnar samples collected from the main inlet of Yalu River Estuary were analyzed and compared with the results of the dating and granularity studies of four columnar sediments in the West Inlet and the West Bank Tidal flat.In this paper, the coupling effect between sediment, estuary sediment and coastal development in the river basin and the new evidence of geomorphologic evolution in Yalu River estuary are discussed.The results show that there are two kinds of sedimentary processes in the main branch of Yalu River Estuary, river and tidal current, which are different in different periods, the sedimentary characteristics of which are consistent with those of the western branch and the West Bank tidal flat, and the sedimentary period of which is dominated by tidal current.The material source of the main inlet sediment is different from that of the west branch channel and the west coast tidal flat.The sedimentary records of the main inlet, the west branch and the adjacent coast of Yalu River Estuary are responsive to environmental changes, human activities and major floods in the basin. The response time is basically synchronous and has coupling effect.There are five obvious "event signals" in the sedimentary records, among which 1960 is the most important time when the geomorphology of the Yalu River estuary changed dramatically.
【作者单位】：辽东学院城市建设学院;南京大学海岸与海岛开发教育部重点实验室;辽中县水利局水务与资源管理办公室;
【基金】：国家自然科学基金(41271028,41576043)
【分类号】：P736.21;P931.1

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