Japan Geoscience Union Meeting 2016

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International Session (Poster)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-GE Geological & Soil Environment

[A-GE05] Subsurface Mass Transport and Environmental Assessment

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Shoichiro Hamamoto(Department of Biological and Environmental Engineering, The University of Tokyo), Yasushi Mori(Graduate School of Environmental and Life Science, Okayama University), Hirotaka Saito(Department of Ecoregion Science, Tokyo University of Agriculture and Technology), Ken Kawamoto(Graduate School of Science and Engineering, Saitama University), Ming Zhang(Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology)

5:15 PM - 6:30 PM

[AGE05-P20] Change in groundwater quality during the long term thermal loading and cooling

*Masato Kenmochi1, Takeshi Saito1, Ken Kawamoto1, Toshiko Komatsu1 (1.Graduate School of Science and engineering, Saitama University)

Keywords:groundwater quality, subsurface temperature, thermal loading

Recently, the subsurface temperature increase due to global warming, heat island phenomenon, the waste heat from the underground structures and some other causes has been observed worldwide. Increase in subsurface temperature might affect groundwater quality (e.g., dissolution of toxic substances such as heavy metals in the soil, generation of metabolic substances by the change of microbial activity). But its effects are not well understood. Therefore, the purpose of this study is to investigate the effects of subsurface temperature increase on groundwater quality. In this study, the subsurface heat exchanger installed in the experimental site at Saitama University campus and water of 40 ℃ and 60 ℃ was circulated in the heat exchanger for the thermal loading test. The groundwater quality was measured at four monitoring wells with two aquifers. As a result of thermal loading, the concentration of several components (K, Na, NH3, B, Li, Si, As) increased with subsurface temperature increase, while the concentration of a few components (Mg, Ca) decreased. These results show that the subsurface temperature increase affects groundwater quality.