江苏北部潮滩沉积物中137Cs和210pb的分布特征（英文）

编号 zgly0001586150

文献类型 期刊论文

文献题名 江苏北部潮滩沉积物中137Cs和210pb的分布特征（英文）

作者 刘志勇  潘少明  刘旭英  高建华 

作者单位 MinistryofEducationKeylaboratoryofCoastalandIslandDevelopment  NanjingUniversity 

母体文献 Journal of Geographical Sciences 

年卷期 2010年01期

年份 2010 

分类号 P736.211 

关键词 tidalflats  grain-sizeinformation  137Csand210Pbdating  sedimentrates  northJiangsuprovince 

文摘内容 Seven cores were collected from different sediment zones of tidal flats at Xin-yanggang in north Jiangsu province in August 2007. Sediment grain-size distribution and radioisotopes of 137Cs and 210Pb analysis were carried out for these cores. Sediment rates of the cores and radioisotopes distribution in surface sediment in different zones of the tidal flat were calculated from the 137Cs and 210Pb activities in sediments cores. The results indicated that each tidal zone had experienced different evolution phases,hydrological dynamics in the tidal flats made the grain-size of the surface sediment change gradually. 137Cs and 210Pb ac-tivities on the superficial layer of the cores varied spatially and the reason was discussed. On tidal flats,the fluctuation of 137Cs and 210Pb activities in the cores reflected the special sedi-mentary characteristics. Vegetation affects the grain-size distribution and the vertical profiles of 137Cs and 210Pb in the upper depths. 137Cs and 210Pb chronology got the comparable av-erage sediment rates on the tidal flat. The characteristics of 137Cs and 210Pb in the cores re-flected various depositional dynamical environments in different tidal zones and gave infor-mation on the different evolvement phases of the tidal zones. Based on the information of grain-size distribution,texture of the cores,sediment rates and topography,the evolution lines of the tidal flat were reconstructed.