Atmospheric and Hydrospheric Sciences (A)
Session Sub-category Hydrology & Water Environment(HW)
Session ID A-HW34
Title Isotope hydrology 2026
Short Title Isotope hydrology 2026
Main Convener Name Masaya Yasuhara
Affiliation Rissho Univ.
Co-Convener 1 Name Koki Kashiwaya
Affiliation Graduate School of Engineering, Kyoto University
Co-Convener 2 Name Stephen Gingerich
Affiliation United States Geological Survey
Co-Convener 3 Name Takashi Nakamura
Affiliation International Research Center for River Basin Environment, University of YAMANASHI
Co-Convener 4 Name Kazuyoshi Asai
Affiliation Geo Science Laboratory
Session Language 
E
Scope 
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.
Presentation Format Oral and Poster presentation
Time Presentation No Title Presenter
Oral Presentation May 29 AM1
9:05 - 9:30 AHW34-01 Determining Travel Time Distributions and Process Responses in Managed Aquifer Recharge Using Isotope and Dissolved Gas Tracers Jared David van Rooyen
9:30 - 9:55 AHW34-02 Deciphering the groundwater flow system in the Kumagawa River basin using multi-isotope tracers Hirochika Sumino
9:55 - 10:10 AHW34-03 Triple isotopic composition of oxygen from rainfall in central Japan Jian ZHANG
10:10 - 10:25 AHW34-04 Short-term variations in precipitation isotope ratios and their controlling factors in "Senjo-Kousuitai" that occurred in northern Kyushu in August 2025 Nagaoka Teru
Oral Presentation May 29 AM2
10:45 - 11:10 AHW34-05 Sources and Transformation of Nitrogen in Shallow Groundwater in the Shinagawa City, Tokyo: Hydrochemistry and Multi-Nitrogen Isotopes Lan Anh Phung Thi
11:10 - 11:25 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 Nguyen
11:25 - 11:40 AHW34-07 Seismic response characteristics of spring water in Aso Caldera revealed by multiple tracer analysis: focusing on changes in endmember composition Mori Ueyama
11:40 - 11:55 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 Yamamoto
11:55 - 12:10 AHW34-09 Implications of vertebrate DNA found in urban shallow groundwater in Shinagawa, central Tokyo, Japan Masaya Yasuhara
Presentation No Title Presenter
Poster Presentation May 29 PM3
AHW34-P01 A geochemical study on urban shallow groundwater system in central Tokyo, Japan Yuki Itoh
AHW34-P02 Groundwater quality in the double-cropping area of northwestern Saitama Prefecture, Japan Yuka Saito
AHW34-P03 Long-term variations in isotopic ratios of precipitation in Nagoya City Kazuyoshi Asai
AHW34-P04 Tracking Isotopic Signatures in Indian Monsoon Extremes: Insights from IsoGSM Simulations Sreeshma K
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 Yasuhara
AHW34-P06 Recharge and Mixing Processes in the Coastal Aquifer of the Eastern Boso Peninsula: A Multi-Tracer Approach Shota KAMBAYASHI
AHW34-P07 Groundwater Mixing and Flow Structure in a Valley Constriction area. SHUNSUKE ISHII
AHW34-P08 Characterizing recharge signatures of mountain river water in the Japanese Southern Alps using d-excess Tatsuki Kimura
AHW34-P09 Groundwater Flow Characteristics and Hydrological process in Volcanic and Non-Volcanic Fault Regions Anna Sano