Geochemical and isotopic signatures for the identification of seawater intrusion in an alluvial aquifer

Journal of Earth system science

S P Rajaveni1¹  L Elango1¹  Indu S Nair1¹  M Schneider2² 

[1] Department of Geology, Anna University, Chennai 600 025, India.$$;Institute of Geological Sciences, Freie Universitaet Berlin, Germany.$$

关键词: Isotopic signatures;    geochemical indicators;    seawater intrusion;    major ionic ratios;    Arani and Koratalaiyar rivers;    coastal aquifers;    Chennai;    India.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Seawater intrusion is one of the alarming processes that reduces the water quality and imperils the supply of freshwater in coastal aquifers. The region, north of the Chennai city, India is one such site affected by seawater intrusion. The objective of this study is to identify the extent of seawater intruded area by major geochemical and isotopic signatures. A total of 102 groundwater samples were collected and analysed for major and minor ions. Groundwater samples with electrical conductivity (EC) greater than 5000 𝜇S/cm and a river mouth sample were analyzed for Oxygen-18 (𝛿18O) and Deuterium (𝛿2H) isotopes to study their importance in monitoring seawater intrusion. The molar ratio of geochemical indicators and isotopic signatures suggests an intrusion up to a distance of 13 km from the sea as on March 2012 and up to 14.7 km during May 2012.

【 授权许可】

Unknown