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在深圳湾西北部海域进行表层沉积物取样,通过粒度分析获取沉积物粒度参数。结果表明,该海域中北部沉积物以粉砂为主,分选较差;局部有较粗的砂、砾沉积物分布,分选性差。地质统计分析结果显示,粒度参数半方差—距离的相关性与沉积物粒度参数的空间分布有关,剔除空间“异常”值后,可在半方差图中获取粒度参数的变程值,并将其作为粒径趋势模型的特征距离。粒径趋势分析表明,海湾西部海域的沉积物向东北净输运,深圳河口海域的沉积物偏西向输运,从而在海湾北部近岸海域形成一个沉积物汇聚中心,这与水动力观测结果基本吻合。此外,210Pb测年结果也表明,这个沉积物汇聚中心的沉积速率也相应较高,显示出较强的淤积趋势。
Samples of surface sediment were taken from the northwestern part of Shenzhen Bay and particle size parameters were obtained by particle size analysis. The results show that the sediments in the north-central part of the sea area are dominated by silt, which is poorly sorted. Partially coarse sand and gravel sediments are distributed with poor sorting. The results of geostatistical analysis show that the correlation between the semi-variance and the distance of the particle size parameter is related to the spatial distribution of the sediment particle size parameter. After removing the space “abnormal ” value, the variation of the particle size parameter can be obtained in the semi-variance figure Use it as the feature distance for the particle size trend model. The trend of grain size shows that the sediments in the western sea of the Gulf are transported to the northeast, and the sediments in the estuary of Shenzhen are transported westward, forming a sedimentary center in the northern coastal waters of the Gulf. This is consistent with the results of hydrodynamic observations Anastomosis. In addition, the results of 210Pb dating also showed that the depositing rate of sediment center was correspondingly higher, indicating a strong sedimentation trend.