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Radium isotopes distribution and submarine groundwater discharge in the Bohai Sea

Yi, Lixin; Dong, Na; Zhang, Linus LU ; Xiao, Guoqiang; Wang, Hongpeng and Jiang, Xingyu (2019) In Groundwater for Sustainable Development 9.
Abstract

In order to characterize the radium distribution and submarine groundwater discharge (SGD) in the Bohai Sea area, the three isotopes 223Ra, 224Ra and 228Ra in different water bodies were measured in a 4-year period with the radium-delayed coincidence counting (RaDeCC) system. The results indicated that radium activities take an order of groundwater > coastal seawater > river water > central seawater. The radium activities of groundwater were controlled by the lithology, human activities and salinity. Groundwater in aquifers with higher content of Th and U like igneous and metamorphic has higher radium activities, high salinity and oil exploitation which leads to groundwater contamination can... (More)

In order to characterize the radium distribution and submarine groundwater discharge (SGD) in the Bohai Sea area, the three isotopes 223Ra, 224Ra and 228Ra in different water bodies were measured in a 4-year period with the radium-delayed coincidence counting (RaDeCC) system. The results indicated that radium activities take an order of groundwater > coastal seawater > river water > central seawater. The radium activities of groundwater were controlled by the lithology, human activities and salinity. Groundwater in aquifers with higher content of Th and U like igneous and metamorphic has higher radium activities, high salinity and oil exploitation which leads to groundwater contamination can also cause the higher radium activities. The radium isotopes of offshore waters were controlled by their respective onshore groundwater and SGD flux rates. The relative level of radium Ra isotope activity of coastal groundwater and nearshore seawater is determined by the interaction between groundwater and seawater. It is concluded that smaller radium mass transport from bottom sediments and the majority radium were supplied from landward groundwater from horizontal and vertical distribution of Ra isotope. The seasonal investigation showed that the seawater radium activities of 223Ra, 224Ra and 228Ra in autumn were higher than that in spring. Based on the seasonal variation of radium activities and the mass balance of radium, SGD of the Bohai Sea during rainy season were calculated to be 1.43 × 108 m3/d (3.73 × 10−3 m3/m2/d) in northern region and 2.84 × 107 (1.76 × 10−3 m3/m2/d) in western region by 228Ra.

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organization
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Contribution to journal
publication status
published
subject
keywords
Geological lithology, Radium isotope, Seasonal variation, Submarine groundwater discharge, The Bohai sea
in
Groundwater for Sustainable Development
volume
9
external identifiers
  • scopus:85067869934
DOI
10.1016/j.gsd.2019.100242
language
English
LU publication?
yes
id
c122cb1f-5e63-45a7-a511-e57ed9016b00
date added to LUP
2019-07-04 13:01:30
date last changed
2019-07-30 05:05:57
@article{c122cb1f-5e63-45a7-a511-e57ed9016b00,
  abstract     = {<p>In order to characterize the radium distribution and submarine groundwater discharge (SGD) in the Bohai Sea area, the three isotopes <sup>223</sup>Ra, <sup>224</sup>Ra and <sup>228</sup>Ra in different water bodies were measured in a 4-year period with the radium-delayed coincidence counting (RaDeCC) system. The results indicated that radium activities take an order of groundwater &gt; coastal seawater &gt; river water &gt; central seawater. The radium activities of groundwater were controlled by the lithology, human activities and salinity. Groundwater in aquifers with higher content of Th and U like igneous and metamorphic has higher radium activities, high salinity and oil exploitation which leads to groundwater contamination can also cause the higher radium activities. The radium isotopes of offshore waters were controlled by their respective onshore groundwater and SGD flux rates. The relative level of radium Ra isotope activity of coastal groundwater and nearshore seawater is determined by the interaction between groundwater and seawater. It is concluded that smaller radium mass transport from bottom sediments and the majority radium were supplied from landward groundwater from horizontal and vertical distribution of Ra isotope. The seasonal investigation showed that the seawater radium activities of <sup>223</sup>Ra, <sup>224</sup>Ra and <sup>228</sup>Ra in autumn were higher than that in spring. Based on the seasonal variation of radium activities and the mass balance of radium, SGD of the Bohai Sea during rainy season were calculated to be 1.43 × 10<sup>8</sup> m<sup>3</sup>/d (3.73 × 10<sup>−3</sup> m<sup>3</sup>/m<sup>2</sup>/d) in northern region and 2.84 × 10<sup>7</sup> (1.76 × 10<sup>−3</sup> m<sup>3</sup>/m<sup>2</sup>/d) in western region by <sup>228</sup>Ra.</p>},
  articleno    = {100242},
  author       = {Yi, Lixin and Dong, Na and Zhang, Linus and Xiao, Guoqiang and Wang, Hongpeng and Jiang, Xingyu},
  keyword      = {Geological lithology,Radium isotope,Seasonal variation,Submarine groundwater discharge,The Bohai sea},
  language     = {eng},
  series       = {Groundwater for Sustainable Development},
  title        = {Radium isotopes distribution and submarine groundwater discharge in the Bohai Sea},
  url          = {http://dx.doi.org/10.1016/j.gsd.2019.100242},
  volume       = {9},
  year         = {2019},
}