GRAIN SIZE CHARACTERISTICS OF SURFICIAL SEDIMENTS AND THEIR RESPONSE TO HYDRODYNAMICS OVER THE COASTAL WATERS OF NORTHERN JIANGSU PROVINCE
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摘要: 对2007年9-11月在南黄海辐射沙脊区和江苏北部潮滩采集的表层底质样品进行粒度分析,获得了平均粒径、分选系数、偏态、峰态等粒度参数,并对其进行了聚类分析。结果表明,9 m以浅和20 m以深的样品可归为两种类型的沉积物,而水深9~20 m之间的沉积物两种类型都有,多样性较大。由Gao-Collins粒径趋势分析模型获得的沉积物净输运趋势显示,除外毛竹砂处沉积物有向外海输运的趋势之外,其他外围的断面均显示泥砂向辐射沙洲中心输运,这与历史资料中记录的结果相一致,表明粒径趋势分析适用于大型辐射沙洲海域。根据Sternberg图分析,粒度参数的空间分布是由差异性输运造成,沉积物从射阳河口岸外向大丰潮间带上部输运的过程中,众数粒径几乎全部以悬移质的形式输运,而小庙洪向东灶潮滩上部输运的众数粒径以悬移方式输运的概率只有60%,从而使射阳河口岸外与大丰潮间带上部的沉积物粒度参数相同,而小庙洪与东灶潮间带上部的沉积物粒度参数有显著差异。Abstract: Surfical sediment samples were collected from the radial tidal ridge areas and tidal flats on the Jiangsu coast during September to November 2007. The moment grain size parameters (i.e. mean size, sorting coefficient, skewness and kurtosis) are obtained by grain size analysis, and cluster analysis was carried out for the parameters. The result indicates that water depth being shallower than 9 m, sediment samples can be grouped into the same type. Likewise, when the water depth is more than 20 m,sediments belong to another type. However, if the water depth is between 9 and 20 m, there are various types of sediments. Grain size trends obtained using the Gao-Collins model show that there is general trend of transporting towards the central part of the coast, except for the Waimaozhu sandbank. Such a pattern is consistent with the measured sediment transport pathways reported in literature. On the basis of an analysis using the Sternberg diagram, the effect of differential sorting during sediment transport is the main process for the distribution of surficial sediments. The sediments are almost entirely transported in suspension from the Sheyang estuary towards the Dafeng tidal flat, while only around 60% of the sediments are transported in suspension from the Xiaomiaohong channel to the Dongzao tidal flat. This process results in the unified sediment grain size parameters for the surfical sediments between the Sheyang estuary and the Dafeng tidal flat, and different sediment grain size parameters between the Xiaomiaohong channel and the Dongzao tidal flat.
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Keywords:
- radial tidal ridges /
- tidal flats /
- grain size parameters /
- water depth /
- South Yellow Sea
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