Impact of agriculture and brackish-fishpond to groundwater vulnerability in Indonesian rural coastal alluvial plain deduced from major ions, water isotope, and sulfate isotope

Anna Rusydi1, Shin-ichi Onodera1, Mitsuyo Saito2, Seiichiro Ioka3, Robert Mohammad Delinom4, Rizka Maria4 and Yusuke Tomozawa1, (1)Hiroshima University, Higashi-Hiroshima, Japan, (2)Okayama University, Okayama, Japan, (3)Hirosaki University, Hirosaki, Japan, (4)Indonesian Institute of Sciences, Bandung, Indonesia