[A-HW34] Isotope hydrology 2026

Fri. May 29, 2026 5:15 PM - 7:00 PM Poster Hall (Exhibition Hall 7&8, Makuhari Messe)

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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5:15 PM - 7:00 PM

[AHW34-P01] A geochemical study on urban shallow groundwater system in central Tokyo, Japan

*Yuki Itoh¹, Masaya Yasuhara², Seongwon Lee², Takashi Nakamura³, Kazuyoshi Asai⁴, Masaaki Takahashi⁵ (1. Rissho University graduate School of Geo-environmental Science, 2. Faculty of Geo-Environmental Science, Rissho University, 3. International Research Center for River Basin Environment, University of YAMANASHI, 4. Geo Science Laboratory, 5. National Institute of Advanced Industrial Science and Technology (AIST))

5:15 PM - 7:00 PM

[AHW34-P02] Groundwater quality in the double-cropping area of northwestern Saitama Prefecture, Japan

*Yuka Saito¹, Yuki Itoh², Masaya Yasuhara¹, Seongwon Lee¹, Takashi Nakamura³, Hiroshi A Takahashi⁴ (1. Department of Environmental Systems, Faculty of Geo-Environmental Science, RISSHO University, 2. Rissho University graduate School of Geo-environmental Science, 3. International Research Center for River Basin Environment, University of YAMANASHI, 4. Geological Survey of Japan, AIST)

5:15 PM - 7:00 PM

[AHW34-P03] Long-term variations in isotopic ratios of precipitation in Nagoya City

*Kazuyoshi Asai¹, Yuji Kato¹ (1. Geo Science Laboratory)

5:15 PM - 7:00 PM

[AHW34-P04] Tracking Isotopic Signatures in Indian Monsoon Extremes: Insights from IsoGSM Simulations

*Sreeshma K¹, Lekshmy Palliyil Ravisankar², Midhun Madhavan³ (1. Department of Atmospheric Sciences, Cochin University Of Science and Technology, 2. Biological Sciences, Wayne State University, Michigan, USA, 3. School for Environment and Sustainability, University of Michigan, USA)

5:15 PM - 7:00 PM

[AHW34-P05] Estimating groundwater recharge of an alluvial fan by river water infiltration - A case study based on δD, δ¹⁸O of water and δ¹³C of DIC -

*Masaya Yasuhara¹, Seongwon Lee¹, Rikuto Kamiguchi², Yoko Togo³, Tsuyoshi Shintani³, Noritoshi Morikawa³ (1. Faculty of Geo-Environmental Science, Rissho Univ., 2. Himi City Office, 3. Geological Survey of Japan, AIST)

5:15 PM - 7:00 PM

[AHW34-P06] Recharge and Mixing Processes in the Coastal Aquifer of the Eastern Boso Peninsula: A Multi-Tracer Approach

*Shota KAMBAYASHI¹, Saki Nishizawa KATAZAKAI², Yuhei SHIROTANI¹, Naohiko INATOMI¹ (1. Marine Ecology Research Institute, 2. Central Research Institute of Electric Power Industry)

5:15 PM - 7:00 PM

[AHW34-P07] Groundwater Mixing and Flow Structure in a Valley Constriction area.

*SHUNSUKE ISHII¹, Takashi Nakamura², Tatsuki Kimura² (1. University of Yamanashi, 2. Interdisciplinary Centre for River Basin Environment)

5:15 PM - 7:00 PM

[AHW34-P08] Characterizing recharge signatures of mountain river water in the Japanese Southern Alps using d-excess

*Tatsuki Kimura¹, Koichi Sakakibara², Takashi Nakamura¹ (1. Interdisciplinary Centre for River Basin Environment, University of Yamanashi, 2. Department of Environmental Sciences, Faculty of Science, Shinshu University)

5:15 PM - 7:00 PM

[AHW34-P09] Groundwater Flow Characteristics and Hydrological process in Volcanic and Non-Volcanic Fault Regions

*Anna Sano¹, Takashi Nakamura², Kei Nishida² (1. Special Education Program for River Basin Environmental Science, University of Yamanashi (Graduated in 2020), 2. Interdisciplinary Centre for River Basin Environment University of Yamanashi)

Session information

[A-HW34] Isotope hydrology 2026

[AHW34-P01] A geochemical study on urban shallow groundwater system in central Tokyo, Japan

[AHW34-P02] Groundwater quality in the double-cropping area of northwestern Saitama Prefecture, Japan

[AHW34-P03] Long-term variations in isotopic ratios of precipitation in Nagoya City

[AHW34-P04] Tracking Isotopic Signatures in Indian Monsoon Extremes: Insights from IsoGSM Simulations

[AHW34-P05] Estimating groundwater recharge of an alluvial fan by river water infiltration - A case study based on δD, δ¹⁸O of water and δ¹³C of DIC -

[AHW34-P06] Recharge and Mixing Processes in the Coastal Aquifer of the Eastern Boso Peninsula: A Multi-Tracer Approach

[AHW34-P07] Groundwater Mixing and Flow Structure in a Valley Constriction area.

[AHW34-P08] Characterizing recharge signatures of mountain river water in the Japanese Southern Alps using d-excess

[AHW34-P09] Groundwater Flow Characteristics and Hydrological process in Volcanic and Non-Volcanic Fault Regions

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