Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2018-137 Manuscript under review for journal Hydrol. Earth Syst. Sci. Discussion started: 3 May 2018 c Author(s) 2018. CC BY 4.0 License. 1 Assessment of seawater intrusion using multivariate statistical, hydrochemical and 2 geophysical techniques in coastal aquifer, Cha-am district, Thailand 3 Jiraporn Sae-Ju1, Srilert Chotpantarat1, 2, 3, 4, and Thanop Thitimakorn1,3 4 1 Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand 2 Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok, Thailand. 3 Research Program on Controls of Hazardous Contaminants in Raw Water Resources for Water Scarcity Resilience, Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok, Thailand. 5 4 Research Unit of Green Mining (GMM), Chulalongkorn University, Bangkok, Thailand. * Corresponding author. Tel.: (662)2185442; Fax.: (662)2185464; Email:
[email protected]. 6 7 8 9 10 11 12 13 14 15 16 17 1 Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2018-137 Manuscript under review for journal Hydrol. Earth Syst. Sci. Discussion started: 3 May 2018 c Author(s) 2018. CC BY 4.0 License. 18 ABSTRACT 19 Seawater intrusion in coastal areas is one of the important environmental problems, causing negative impact 20 on groundwater resources in the future. To assess and mitigate the seawater intrusion, the affected aquifers 21 need to be characterized. By integrating geophysical investigation and multivariate statistical analysis of 22 the hydrochemical data, seawater intrusion into coastal aquifers in this area could be evaluated.