Abstract
Information on the distribution of subsurface temperature and hydraulic heads at 24 observation wells in and around the Tokyo Lowland, the eastern part of the Tokyo Metropolitan area, were examined to make clear the relationship between groundwater and the subsurface thermal environment in the urban area. Minimums in temperature–depth logs due to subsurface temperature increasing at shallow parts were recognized in 21 wells. This fact shows subsurface temperature is affected by ground surface warming in almost all of this area. Deeper than minimums, where the effects of surface warming became relatively small, regional variation is observed as follows: high temperatures are shown in the central part to the southern part, and low temperatures shown in the inland to eastern part. The high temperature area corresponds to an area where the lower boundary of groundwater flow is relatively shallow. This area corresponds also to an area with severe land subsidence resulting from excessive groundwater pumping. It is considered that this high temperature area is formed by the effects of upward groundwater flow affected by hydrogeological conditions and pumping. On the other hand, a comparison between past data (1956–1967) and present data (2001–2003) revealed widespread decreasing temperature in the inland area. This is explained by downward groundwater flow based on an analysis of temperature–depth logs. This fact suggests that subsurface temperature is not only increasing from the effects of surface warming but also decreasing from the effects of groundwater environment change due to pumping.
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Acknowledgments
The authors are grateful to Makoto Taniguchi, Jacek Majorowicz, Raymond Irwin for their valuable comments, which helped to prepare the final version. Part of this content has been reported in the Journal of Japanese Society of Engineering Geology (Miyakoshi et al. 2006).
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Appendix
Appendix
Figure 13 shows observed temperature–depth logs at 24 observation wells in the Tokyo Lowland.
Temperature–depth logs in a 1–6, b 7–12, c 13–18 and d 19–24
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Miyakoshi, A., Hayashi, T., Marui, A. et al. Evaluation of change in subsurface thermal environment due to groundwater flow in the Tokyo Lowland, Japan. Int J Earth Sci (Geol Rundsch) 97, 401–411 (2008). https://doi.org/10.1007/s00531-007-0259-y
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DOI: https://doi.org/10.1007/s00531-007-0259-y