检索结果-南通市图书馆

Estimating submarine groundwater discharge at a subtropical river estuary along the Beibu Gulf,China

Acta Oceanologica Sinica 2021年第9期40卷 13-22页

作者： Xilong Wang Kaijun Su Juan Du Linwei Li Yanling Lao Guizhen Ning Li Bin Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf Beibu Gulf UniversityQinzhou 535011China Institute of Radiation Medicine Chinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300192China Key Laboratory of Coastal Science and Engineering Beibu Gulf UniversityQinzhou 535011China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China Research Centre for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China Qinzhou Key Laboratory of Land Resources Use and Monitor Beibu Gulf UniversityQinzhou 535011China

In certain regions,submarine groundwater discharge(SGD)into the ocean plays a significant role in coastal material fluxes and their biogeochemical cycle;therefore,the impact of SGD on the ecosystem cannot be ignored.In this study,SGD was estimated using naturally occurring radium isotopes(^(223)Ra and ^(224)Ra)in a subtropical estuary along the Beibu Gulf,China.The results showed that the Ra activities of submarine groundwater were approximately 10 times higher than those of surface water.By assuming a steady state and using an Ra mass balance model,the SGD flux in May 2018 was estimated to be 5.98×10^(6) m^(3)/d and 3.60×10^(6) m^(3)/d based on 224Ra and 223Ra,respectively.At the same time,the activities of Ra isotopes fluctuated within a tidal cycle;that is,a lower activity was observed at high tide and a higher activity was seen at low tide.Based on these variations,the average tidal pumping fluxes of SGD were 1.15×10^(6) m^(3)/d and 2.44×10^(6) m^(3)/d with 224Ra and 223Ra,respectively.Tidaldriven SGD accounts for 24%-51%of the total SGD.Therefore,tidal pumping is an important driving force of the SGD in the Dafengjiang River(DFJR)Estuary.Furthermore,the SGD of the DFJR Estuary in the coastal zone contributes significantly to the seawater composition of the Beibu Gulf and the material exchange between land and sea.

关键词： radium isotopes submarine groundwater discharge balance model tidal pumping Dafengjiang River Estuary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Measurement of ^(224)Ra, ^(226)Ra and ^(228)Ra in seawater using Mn-fiber adsorption-γ spectrum method

引用

Acta Oceanologica Sinica 2000年第2期19卷 19-27页

作者： Liu Guangshan1 Huang Yipu1 Chen Xinbao1 (1. Department of Oceanography, Xiamen University, Xiamen 361005, China) Department of Oceanography Xiamen University Xiamen 361005 China

The specific activities of ^(224) Ra, ^(226)Ra and ^(228)Ra were determined by measuring γ-ray of their daughters with HPGe γ spectrometer after preconcentrating Ra isotope with Mn-fiber adsorption from large volume seawater. The calculating formulas of specific activities of the three nuclides were de rived. The methods of sample preparation and spectrum analysis were discussed. The advantages of the method are simple, rapid and three nuclides can be determined simultaneously.

关键词： radium isotopes seawater γ-spectrum analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：