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The response of sedimentary record to catchment changes induced by human activities in the western intertidal flat of Yalu River Estuary, China

机译:鸭绿江口西部潮间带沉积记录对人类活动引起的汇水变化的响应

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摘要

The response to the catchment changes of the sedimentary environment of the western intertidal flat of Yalu River Estuary was investigated by analyzing the vertical variations of the grain size of sediment cores, along with the hydrologic data and human activities in the catchment. The results demonstrated a stepwise decreasing trend for the variations of both the sediment load and water discharge into the sea, which could be divided into three stages as 1958–1970, 1971–1990 and 1991–2009. Reservoir construction and the changes of catchment vegetation coverage turned out to be the two predominant contributors to the changes. There are four periods for the variation of the sensitive components of the sediment cores from 1940 to 2010, i.e., 1940–1950, 1951–1980, 1981–1990 and 1991–2010. The vertical distribution of grain size in the cores mainly varied with the changes of vegetation coverage in the catchment and reservoir construction from 1960 to 1980, whereas it varied depending on the intensity of water and soil erosion in the catchment from 1980 to 1990. Despite the further reduction of the water and sediment input into the sea from 1990 to 2009, this period was characterized by coarsening trends for the grain size of sediment in the estuarine intertidal flat and correspondingly, the significantly increased silt contents of the sensitive component.
机译:鸭绿江口西部潮间带沉积环境对集水区变化的响应,通过分析沉积岩心粒径的垂直变化以及集水区的水文资料和人类活动,进行了研究。结果表明,沉积物负荷和入海水量的变化呈逐步下降的趋势,可分为1958-1970年,1971-1990年和1991-2009年三个阶段。水库建设和流域植被覆盖率的变化是导致变化的两个主要因素。从1940年到2010年,沉积物芯的敏感成分有四个变化时期,即1940-1950年,1951-1980年,1981-1990年和1991-2010年。 1960年至1980年,流域核心区域的粒径垂直分布主要是随着集水区植被覆盖的变化而变化的,而1980年至1990年,流域内水土流失的强度则取决于植被的变化。 1990年至2009年,流入海中的水和沉积物进一步减少,这一时期的特征是河口潮间带沉积物的粒径趋于粗化,相应地,敏感部分的泥沙含量也显着增加。

著录项

  • 来源
    《海洋学报(英文版)》 |2017年第4期|54-63|共10页
  • 作者单位

    National Ocean Technology Center, Tianjin 300111, China;

    Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China;

    National Ocean Technology Center, Tianjin 300111, China;

    Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China;

    Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China;

    Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China;

    Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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  • 入库时间 2022-08-19 03:57:50
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