Study of shallow groundwater quality evolution under saline intrusion with environmental isotopes and geochemistry |
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| Authors: | F Ma Y S Yang R Yuan Z Cai S Pan |
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| Institution: | (1) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, People’s Republic of China;(2) School of Earth Ocean and Planetary Sciences, Cardiff University, Cardiff, CF10 3YE, UK |
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| Abstract: | Evolution of the shallow groundwater quality under saline intrusion in porous aquifer system has been studied with environmental
isotopes and geochemistry in the Laizhou Bay area, China. Two campaigns of water sampling from various sources were carried
out in spring and winter for environmental isotopic and chemical analyses. The origin of groundwater salinity from intrusion
of both modern seawater and deep brine water was identified by analysing the correlations between 18O, D, T, Cl−, SO42− and electrical conductivity. The results indicate that the brine is originated from evaporating and concentrating of intruded
seawater and its δD and δ18O are different from modern seawater but similar to those of mixture of seawater with fresh groundwater. It is hard to distinguish
the salinity origin in this area by the δD–δ18O relationship alone. The relations between δ18O and conductivity, Cl− and SO42− have been used to identify the salinity origin due to the distinct difference in salinity between the brine and seawater,
conjunctively with use of T. A threshold of T = 12 TU was adopted to identify the origin of saline groundwater. |
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| Keywords: | Shallow groundwater Salinity origin Environmental isotope Geochemistry Saline intrusion Eastern China |
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