鸭绿江口沉积粒度特征及其对沉积环境演化的指示

发布时间：2018-01-03 18:42

本文关键词：鸭绿江口沉积粒度特征及其对沉积环境演化的指示　出处：《海洋地质与第四纪地质》2017年03期 　论文类型：期刊论文

【摘要】：基于鸭绿江口主汊道10个沉积柱的粒度分析,讨论了鸭绿江口水动力条件、物源输入、沉积事件等沉积环境的演化过程。沉积记录显示,空间上自陆向海潮流对沉积的影响逐渐加强,时间上从上层到下层的径流影响逐渐减弱。沉积物的敏感粒度分析表明,细组分可能来源于鸭绿江径流;粗组分大部分来源于径流悬移质中的较粗部分和跃移质,少部分来源于浅海潮流脊的物质。在可识别的9个沉积事件中,4个与洪水直接相关,其他也表现出对环境事件或流域变化的响应。1960年的沉积事件非常重要,导致了河口地貌"二级分汊,三口入海"的重大地貌格局的形成。鸭绿江河口三角洲沉积与西岸潮滩的沉积具有"耦合效应",1970年、1988—1992年和1995年的沉积事件在鸭绿江口西汊道及西岸潮滩剖面中同样存在,可以用来进行地层的划分和对比。
[Abstract]:Based on the grain size analysis of 10 sediment columns in the main inlet of Yalu River Estuary, the evolution process of sedimentary environment, such as hydrodynamic conditions, source input and sedimentary events, is discussed. In space, the influence of tidal current from the continental to the sea on the sediment is gradually strengthened, and the influence of runoff from the upper layer to the lower layer is gradually weakened in time. The analysis of the sensitive granularity of the sediment shows that the fine components may originate from the runoff of the Yalu River. Most of the coarse components are derived from the coarse parts and leaps in the runoff suspended sediment, and a few from the shallow sea tidal ridges. Of the 9 identifiable sedimentary events, 4 are directly related to the flood. Others also show responses to environmental events or watershed changes. The sedimentary events of 1960 were very important, resulting in estuarine geomorphology "secondary branching". The formation of the important geomorphological pattern of "three ports into the sea". The delta deposits in the Yalu River estuary and the tidal flat deposits in the West Bank have a "coupling effect", 1970. The sedimentary events of 1988-1992 and 1995 also existed in the west branch of Yalu River Estuary and the tidal flat section of the West Bank, which can be used for stratigraphic division and correlation.
【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】：国家自然科学基金项目(41271028,41576043)
【分类号】：P736.21
【正文快照】： 沉积物粒度特征及其时空分布是河口沉积物的基本属性之一,蕴含了物质来源、水动力条件、沉积事件等重要信息。在沉积物测年的基础上,依据沉积物的粒度频率曲线、粒度参数、敏感粒度变化特征可以进行沉积环境的判别,推断沉积时的动力条件,帮助人们更好地认识海陆变迁、物源输入

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