Tomochika Tokunaga / Associate Professor / Division of Environmental Studies
Department of Environment Systems / / Sustainable development of subsurface environment, hydrogeology, poromechanics

Career Summary
1989: Graduated, Faculty of Science, The University of Tokyo
1991: MSc. from The University of Tokyo
1991: Research Associate, The University of Tokyo
1996: Doctor of Engineering from The University of Tokyo
1997-98: Visiting Researcher, Department of Geology and Geophysics, University of Wisconsin-Madison
1999: Associate Professor, The University of Tokyo
Educational Activities
Graduate school:Geosphere Environment, Projects on Environment Systems(fieldwork)
Research Activities
The underground geosphere environment has been extensively used to support highly developed human society, e.g., extraction of energy resources and groundwater, waste disposal, and construction of tunnels and underground spaces. Due to these activities, environmental problems which affect the sustainability of our society have emerged. Our laboratory aims to understand and predict changes in the geosphere environment that are caused by human activities and to develop necessary engineering measures to attain sustainable use of geosphere environment.
Current research topics include sustainable usage of groundwater for improving the urban environment, analyzing and modeling long-term fluid flow and material transport processes through the geosphere with possible applications to waste disposal and energy resource exploration, analyzing water cycles in a variety of environments, such as arid areas and areas affected by the Asian monsoons, and developing advanced usage of the geosphere to secure freshwater resources.
1) Binh, N. T. T., Tokunaga, T., Son, H. P. and Binh, M. V., 2007, Present-day stress and pore pressure fields in the Cuu Long and Nam Con Son Basins, offshore Vietnam. Marine Petrol. Geol., 24, 607-615.
2) Tokunaga, T., Kimura, Y. and Shimada, J., 2007, Existence of stagnant fresh groundwater and diffusion-limited chloride migration in sub-sea formation at Yatsushiro bay, Japan. IAHS Publ., 312, 197-200.
3) Miyamoto, H. and Tokunaga, T., 2003, Prospects of engineering applications of submarine-groundwater-discharge research in Japan. In: Taniguchi, M. et al., eds., Land and Marine Hydrogeology, 61-75, Elsevier.
4) Tokunaga, T. and Kameya, H., 2003, Determination of storage coefficient of a porous material from flow-pump experiments: Theoretical analysis and experimental evaluation. Int. J. Rock Mech. Min. Sci., 40, 739-745.
5) Tokunaga, T., 1999, Modeling of earthquake-induced hydrological changes and possible permeability enhancement due to the 17 January 1995 Kobe Earthquake, Japan. J. Hydrol., 223, 221-229.
Other Activities
American Geophysical Union (AGU)
International Association of Engineering Geology and the Environment (IAEG)
American Association of Petroleum Geology (AAPG)
Science Planning Committee (SPC), Integrated Ocean Drilling Program (IODP)
Future Plan
Messages to Students