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首页> 外文期刊>Journal of Coastal Research: An International Forum for the Littoral Sciences >Sedimentary Environment Evolution in East China's Coastal Tidal Flats: The North Jiangsu Radial Sand Ridges
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Sedimentary Environment Evolution in East China's Coastal Tidal Flats: The North Jiangsu Radial Sand Ridges

机译：华东沿海潮汐公寓沉积环境演变：北江苏径向沙脊

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摘要

The North Jiangsu radial sand ridges (NJRSR) are a unique sedimentary system comprising the largest silt and mud coastal tidal flat in China. Many factors influence its tidal geomorphology sensitivity when responding to the marine environment and human activities. In this study, three typical core samples were collected from sampling points near Xinyang Gang (XYG), Chuandong Gang (CDG), and Xiaoyangkou Gang (XYK). Pb-210 and Cs-137 radionuclide dating was used to estimate the sedimentation rate of the tidal flat. On the basis of combined sediment grain size and reclamation history over the last 50 years, the evolution of the NJRSR coastal tidal flat sedimentary environment under the impact of human activities and the changing coastal environment was examine. The result indicated that the predominant type of sedimentary deposition is sandy si however, sediment composition varies because of coastal reclamation activities extending into the sea and with changes in sediment source and depositional forces. Average sedimentation rates of the three core samples were 1.27, 1.85, and 2.43-3.3 cm/y, respectively, reflecting increasing sedimentation rates from north to south. However, sedimentation rates over the past century have gradually declined in core XYG because of a reduced supply of materials from northern sources. Moreover, sand content has increased in the north since the 1980s, and grain size has become coarser. In the middle sample, a sudden change in sediment composition occurred in the 1950s-60s, exhibited by a significant reduction in sand content but an increase in silt content and finer grain sizes. In the south, grain size coarsened initially before becoming finer, likely because of a reduction of eroded material from the Yellow River in the north, increased coastal reclamation activities, and changes in sedimentary dynamics.
机译：北江苏径向砂脊（NJRSR）是一种独特的沉积体系，包括中国最大的淤泥和泥沿着泥滩。在回应海洋环境和人类活动时，许多因素会影响其潮汐地貌敏感性。在这项研究中，在楚隆刚（XYG）附近的抽样点收集了三种典型的核心样本，楚康刚（CDG），小康口刚（XYK）。 PB-210和CS-137放射性核素约会用于估计潮汐平的沉降速率。在过去50年的组合沉积物粒度和填海病史的基础上，审查了人类活动影响下的NJRSR沿海潮汐沉积环境的演变与沿海环境变化。结果表明，沉积沉积的主要类型是砂质淤泥;然而，沉积物组成因沿海填海活动而变化，延伸到海中并随着沉积物来源和沉积力的变化。三个核心样本的平均沉降率分别为1.27,1.85和2.43-3.3cm / y，反映了北向南的增加沉降率。然而，由于北方来源的材料供应量减少，过去世纪过去常年逐渐下降的沉降率。此外，自20世纪80年代以来，北方的砂含量增加，晶粒尺寸变得粗糙。在中间样品中，在20世纪50年代-60S中发生沉积物组成的突然变化，通过砂含量显着降低，但淤泥含量和更细粒尺寸的增加。在南方，粒度最初粗糙，在变得更精细，可能因为北方黄河中的侵蚀材料还原，增加了沿海填海活动，以及沉积动态的变化。

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