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首页> 外文期刊>Journal of Asian earth sciences >Sedimentary records off the modern Huanghe (Yellow River) delta and their response to deltaic river channel shifts over the last 200 years
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Sedimentary records off the modern Huanghe (Yellow River) delta and their response to deltaic river channel shifts over the last 200 years

机译：现代黄河三角洲的沉积记录及其对近200年三角洲河道变化的响应

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摘要

The modern Huanghe (Yellow River) delta sedimentary complex has developed since 1855, when the lower river channel migrated northward from the Yellow Sea to the Bohai Sea. As a result, the river-laden sediment accumulated rapidly on the lowlying plain and formed the mega-delta. Here we present high-resolution sedimentary sequences based on Cs-137 and Pb-210 dating and grain-size parameters of two sediment gravity cores collected near the present river mouth (core All) and in adjacent Laizhou Bay (core A26). Based on these sedimentary sequences, the different responses of the sediment records to natural and artificial channel shifts are presented. The average sedimentation rates of the two cores All (1951-2006) and A26 (1808-2006) were estimated to be 2.25 cm/year and 0.80 cm/year, respectively. The results indicated that the geometry of the delta (e.g. the location of river mouth and changing coastline) and sediment supply from the river played an important role in the sedimentation of the subaqueous delta. The channel shifts in 1976 and 1996 shortened the distances from the river mouth to the location of core All, resulting in the local accumulations of relatively coarse particles from the river mouth. The sedimentation of core A26 indicated four major channel shifts in 1855, 1904, 1947 and 1976. When the river mouth approached the core location, the accumulated sediment became finer; otherwise, the active resuspension due to strong hydrodynamics resulted in the accumulation of coarser sediment. The sediment records preserved in the two gravity cores illustrated different sedimentary responses to the lower channel shifts of the Huanghe and sediment supply from the river at centennial scales, which is critical to understanding the evolution of the modern Huanghe Delta in the past and to predicting the future trend. (C) 2015 Elsevier Ltd. All rights reserved.
机译：现代的黄河三角洲沉积综合体始于1855年，当时下游河道从黄海向北迁移到渤海。结果，充满河流的沉积物在低洼的平原上迅速聚集并形成了巨型三角洲。在这里，我们介绍了基于Cs-137和Pb-210测年的高分辨率沉积序列，以及在当前河口附近（核心All）和邻近的莱州湾（核心A26）收集的两个沉积物重力核心的粒度参数。基于这些沉积序列，提出了沉积物记录对自然通道和人工通道移动的不同响应。据估计，两个岩心All（1951-2006）和A26（1808-2006）的平均沉降速率分别为2.25厘米/年和0.80厘米/年。结果表明，三角洲的几何形状（例如河口的位置和不断变化的海岸线）和河流的沉积物供应在水下三角洲的沉积中起着重要作用。 1976年和1996年的河道转移缩短了从河口到All All中心位置的距离，导致了河口相对较粗颗粒的局部堆积。 A855核心的沉积表明在1855、1904、1947和1976年发生了四个主要的航道转换。当河口接近核心位置时，累积的沉积物变得更细了。否则，由于强大的水动力而导致的主动重悬导致了较粗大的沉积物的堆积。保存在两个重力中心的泥沙记录说明了对黄河下游河道位移的不同沉积反应以及百年尺度上来自河流的泥沙供应，这对于了解过去现代黄河三角洲的演变以及预测黄河三角洲的演变至关重要。未来趋势。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第15期|68-80|共13页
  • 作者

    Wu Xiao; Bi Naishuang; Kanai Yutaka; Saito Yoshiki; Zhang Yong; Yang Zuosheng; Fan Dejiang; Wang Houjie;

  • 作者单位

    Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China|Minist Educ, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China;

    Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China|Minist Educ, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China;

    Natl Inst Adv Ind Sci & Technol, Geol Survey Japan, Tsukuba, Ibaraki 3058567, Japan;

    Natl Inst Adv Ind Sci & Technol, Geol Survey Japan, Tsukuba, Ibaraki 3058567, Japan|Univ Tokyo, Grad Sch Frontier Sci, Dept Nat Environm Studies, Kashiwa, Chiba 2778563, Japan;

    China Geol Survey, Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China;

    Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China|Minist Educ, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China;

    Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China|Minist Educ, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China;

    Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China|Minist Educ, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Huanghe delta; Sedimentation rate; Grain size; Deltaic channel migration;

    机译：黄河三角洲沉积速率粒度三角洲河道迁移;

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