Journal of Japanese Association of Hydrological Sciences
Online ISSN : 1883-7166
Print ISSN : 1342-9612
ISSN-L : 1342-9612
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  • Akinobu MIYAKOSHI, Noritoshi MORIKAWA, Hitoshi TSUKAMOTO, Kazumasa ITO
    2021 Volume 51 Issue 3 Pages 51-63
    Published: December 25, 2021
    Released: December 27, 2021

    Temperature-depth profiles acquired by borehole temperature logging at the casing section were used to evaluate the vertical groundwater flow. Residual effects of borehole drilling construction were confirmed by the observations measured on the day after the construction by comparing the temperature-depth profile data, which were measured four times intermittently during the temporary suspension period of the construction. Consequently, the construction effects were sufficiently reduced after 12 days or more elapsed after the construction was suspended. The depth classification based on the characteristics of changes in the thermal gradient of the data was consistent with the geological classification. Moreover, effects of groundwater flow differed depending on the depth. Based on the type curve match results, the effects of upward groundwater flow were detected in the aquifer between 40 and 128 m of depth. Furthermore, the analysis of the borehole temperature log data indicated that the drilling site was located in the discharge area of the groundwater flow system. Therefore, reducing the effects of drilling disturbances is necessary for the application of borehole temperature logging data in groundwater flow analysis.

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