Japan Geoscience Union Meeting 2016

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW19] Water Environment and Geology in Urban Areas

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Takeshi Hayashi(Faculty of Education and Human Studies, Akita University), Hiroaki SUZUKI(Strategic Technology Development Dept. Research & Development Center, Nippon Koei Co., Ltd.), Kei Nishida(Interdisciplinary Centre for River Basin Environment, Interdisciplinary Graduate School, University of Yamanashi), Motoyuki Asada(Shimizu Corporation), Satoshi Takizawa(Department of Urban Engineering, Graduate School of Engineering, the University of Tokyo), Masaya Yasuhara(Rissho Univ.)

5:15 PM - 6:30 PM

[AHW19-P03] On geochemical and isotopic characteristics of shallow urban groundwater in Shinagawa district, central Tokyo, Japan

*Masaya Yasuhara1, Akihiko Inamura2, Takashi Nakamura3, Kazuyoshi Asai4 (1.Rissho Univ., 2.Geological Survey of Japan, AIST, 3.Univ. Yamanashi, 4.Geo-Science Laboratory)

Keywords:Tokyo, megacity, shallow groundwater, groundwater pollution, isotope, hydrochemical process

Water chemistry of shallow groundwater in the highly-populated Shinagawa district, central Tokyo, Japan, is discussed with special reference to its nitrate, sulfate and chloride concentrations. As a result of the water chemistry analysis, shallow groundwater proved to be characterized by a high nitrate, sulfate, and chloride concentrations. The enriched δ15N and δ18O values of nitrate and δ34S values of sulfate suggest leaking sewers is a potential source of nitrate and sulfate ions in shallow groundwater.