| 摘要: |
| 为了研究灌河口海区的沉积环境,利用激光粒度仪对位于灌河口的柱状样GH-1孔进行了沉积物粒度分析,根据粒级-标准偏差方法对此柱状样的环境敏感粒级进行了计算,并结合对粒度概率曲线图的分析来对该区域进行沉积环境的研究,从而探讨了该环境敏感粒度组分的环境指示意义。在研究区内确定环境敏感粒度组分为250～32 μm,32～16 μm,代表沉积过程中的两种动力机制,分别是风暴流和沿岸流。通过该柱状样的210Pb测年可以得到沉积速率和沉积环境的变化,上段沉积速率较大为1.9cm/a,下段20cm沉积速率较低为0.4cm/a。 |
| 关键词: 灌河口 环境敏感粒度组分 210Pb 沉积变化 |
| DOI： |
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| 基金项目:江苏省环保科技项目(2010043); 连云港市科技发展计划项目(SH1113) |
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| Study on grain-size characteristics and deposition rate in the Guanhe Estuary of Jiangsu Province |
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| Abstract: |
| In order to explore the deposition environment of the Guanhe Estuary, grain-size analysis of sediment GH-1 drilling, retrieved from Guanhe Estuary, was carried out by using a Malvern 2000 grain-size analyzer. The environmentally sensitive grain size components were calculated according to variations in the grain-size standard deviation. The deposition environment was studied combined with the analysis of grain size probability curve. At the same time, the environmental implications were discussed. Two environmentally sensitive grain-size components, 250～32 μm and 32～16 μm, were identified, representing two dynamic mechanisms in the process of sedimentary, storm flow and coastal current. The variation of deposition rate and sedimentary environment can be obtained by using the 210Pb technique. The results show that the deposition rate was larger at 1.9 cm/a, and the deposition rate of the last 20 cm was smaller at 0.4 cm/a. |
| Key words: the Guanhe Estuary environmentally sensitive grain size component 210Pb deposition variation |
