[A-HW34] Isotope hydrology 2026

Fri. May 29, 2026 10:45 AM - 12:15 PM 102 (International Conference Hall, Makuhari Messe)

Chairperson:Kashiwaya Koki(Graduate School of Engineering, Kyoto University), Gingerich Stephen(United States Geological Survey), Asai Kazuyoshi(Geo Science Laboratory), Nakamura Takashi(International Research Center for River Basin Environment, University of YAMANASHI), Yasuhara Masaya(Rissho Univ.)

Isotope hydrology is currently being applied across diverse disciplines,
including limnology, geochemistry, geomorphology, volcanology,
meteorology, agriculture, forestry, civil engineering, sanitary
engineering, ecology, and soil science, and it elucidates the
terrestrial water cycle and associated material cycle in the atmosphere,
hydrosphere, and lithosphere.
This session aims to share the latest results on isotope hydrology and
links research activities across the different disciplines organically
and transversally. Expected outcomes of this session are the discovery
of new isotope tracers, the development of new research areas, and the
return of research results to society.
Not limited to study that utilizes isotopes, presentations based on
general water quality or trace elements are also welcomed if it has the
potential to contribute to or extend to water and material cycle studies.

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10:45 AM - 11:10 AM

[AHW34-05] Sources and Transformation of Nitrogen in Shallow Groundwater in the Shinagawa City, Tokyo: Hydrochemistry and Multi-Nitrogen Isotopes

★Invited Papers

*Lan Anh Phung Thi¹, Itoh Yuki², Lee Seongwon², Yasuhara Masaya³, Ono Ryuga¹, Nakamura Takashi¹ (1. Interdisciplinary Centre for River Basin Environment, University of Yamanashi, Yamanashi, Japan, 2. Graduate School of Geo-environmental Science, Rissho University, Japan, 3. Faculty of Geo-Environmental Science, Rissho Univeristy, Japan)

11:10 AM - 11:25 AM

[AHW34-06] Identifying mountain water contribution and dynamics to the groundwater using stable isotopes and a 2D groundwater flow model, case study: Kofu basin, Yamanashi, Japan.

*Cuong Quoc Nguyen¹, Takashi Nakamura¹, Tatsuki Kimura¹ (1. International Research Center for River Basin Environment, University of YAMANASHI)

11:25 AM - 11:40 AM

[AHW34-07] Seismic response characteristics of spring water in Aso Caldera revealed by multiple tracer analysis: focusing on changes in endmember composition

*Mori Ueyama¹, MAKOTO Kagabu¹ (1. Institute of Integrated Science and Technology, Nagasaki University)

11:40 AM - 11:55 AM

[AHW34-08] Estimation of molten sulfur generation environment at Shiretokoiozan volcano through comparison of the chemical composition and hydrogen and oxygen isotope ratios with hot spring waters in other volcanic lakes

*Mutsunori Yamamoto¹, Koki Kashiwaya², Katsuaki Koike² (1. Osaka Museum of Natural History, 2. Graduate School of Engineering, Kyoto University)

11:55 AM - 12:10 PM

[AHW34-09] Implications of vertebrate DNA found in urban shallow groundwater in Shinagawa, central Tokyo, Japan

*Masaya Yasuhara¹, Kazuki Sekine¹, Yuki Itoh², Kazuhiro Saikawa², Seongwon Lee¹, Tsuyoshi Shintani³, Yoko Togo³ (1. Faculty of Geo-Environmental Science, Rissho Univ., 2. Graduate School of Geo-Environmental Science, Rissho Univ., 3. Geological Survey of Japan, AIST)

Discussion (12:10 PM - 12:15 PM)

Session information