江苏灌河口沉积物粒度组分特征及沉积速率研究  

Study on grain-size characteristics and deposition rate in the Guanhe Estuary of Jiangsu Province

作　　者：徐芳[1] 冯秀丽[1] 陈斌林 贺心然 魏飞[1] 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]连云港市环境保护局,江苏连云港222001 [3]连云港市环境监测中心站,江苏连云港222001

出　　处：《海洋科学》2013年第6期83-88,共6页Marine Sciences

基　　金：江苏省环保科技项目(2010043);连云港市科技发展计划项目(SH1113)

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250～32μm，32～16μm，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。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 compo- nents, 250-32 μm and 32-16 μm, were identified, representing two dynamic mechanisms in the process of sedi- mentary, storm flow and coastal current. The variation of deposition rate and sedimentary environment can be ob- tained by using the ^210pb technique. The results show that the deposition rate was larger at 1.9 cm/a, and the deposi- tion rate of the last 20 cm was smaller at 0.4 cm/a.

关 键 词：灌河口 环境敏感粒度组分 210Pb 沉积变化 

分 类 号：P736.2[天文地球—海洋地质]