Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
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Volume 45, Issue 1
Displaying 1-8 of 8 articles from this issue
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  • Some factors controlling arsenic concentrations of groundwater in the northern part of Osaka Prefecture
    Hiroko ITO, Harue MASUDA, Minoru KUSAKABE
    2003 Volume 45 Issue 1 Pages 3-18
    Published: March 05, 2003
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.3
    JOURNAL FREE ACCESS
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    Seasonal variation of spring water chemistry was investigated to clarify the source of arsenic in groundwater in the Todoromi area, northern part of Osaka Prefecture. Hostrocks of the spring waters are mainly composed of Mesozoic to Paleozoic sedimentary rocks. Total arsenic concentration of the spring waters ranges from 2 to 54μg/l. Water compositions are mainly controlled by the rates of chemical weathering in the Kamitodoromi area. Microbial activity in the soil is suggested to be responsible for the groundwater chemistry in the Shimotodoromi area. The primary source of arsenic in the groundwater is considered to be pyrite in the host rocks, since the arsenic concentration of the groundwater becomes higher as the arsenic concentration of the pyrite in the host rocks increases.
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  • Permeability and tracer movements based on geometrical patterns of fractures
    laboratory experiments with acrylic blocks
    Masahito YOSHIMURA, Masayuki IMAIZUMI, Yasuo SAKURA, Changyuan TANG
    2003 Volume 45 Issue 1 Pages 19-40
    Published: March 05, 2003
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.19
    JOURNAL FREE ACCESS
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    Laboratory experiments were carried out in order to study relationships among fractures' geometrical patterns, permeability and tracer movements. Tracer experiments were conducted with six artificial fracture patterns made of hexahedral acrylic blocks and arranged as natural flow systems in fractured rocks. Movements of this tracer were examined by measuring electric conductivity in fractures' intersections. Analyses of the these results reveal that the flow length and effective porosity of fractures depend on the fracture patterns, producing different permeability and tracer plume patterns. Relationship between Reynolds number and coefficient of dispersion from these experiments shows that mechanical dispersion takes place in different types of fractures, as a parallel plate. Factors controlling mass transport in fracture intersections were explained with a conceptual model of streamline and diffusion zone.
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  • Fundamental study on the measurement of direction and velocity of three-dimensional groundwater flow using a CCD camera in single borehole
    Kaoru KOBAYASHI, Hiroshi CHIKAHISA, Kazunobu MATSUMOTO, Kouki KUMAGAI
    2003 Volume 45 Issue 1 Pages 41-48
    Published: March 05, 2003
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.41
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    Methods for measuring the direction and velocity of groundwater flow are classified into single or multi boring methods. In recent years, single boring methods have been used more frequently because they are more economical, facilitate measurement and provide more accurate data. Where actual groundwater flow in a complex way, however, existing single boring methods have difficulty in measuring the three-dimensional flow of groundwater although they can take measurement for horizontal flow.
    This paper discusses the method for measuring the direction and velocity of groundwater flow using a CCD camera and prism to economically and accurately identify the three-dimensional groundwater flow in single borehole. In this study, the accuracy of measurement was also verified based on the results of laboratory tests. As a result, it was found that the proposed method enabled the measurement of the direction and velocity of three-dimensional groundwater flow using a CCD camera in single borehole with great accuracy.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    2003 Volume 45 Issue 1 Pages 49-58
    Published: March 05, 2003
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.49
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    2003 Volume 45 Issue 1 Pages 59-72
    Published: March 05, 2003
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.59
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  • [title in Japanese]
    [in Japanese]
    2003 Volume 45 Issue 1 Pages 73-80
    Published: March 05, 2003
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.73
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  • Visit to Valuable Water Springs (60) Valuable Water Springs in Tokyo
    Springs in the Musashino Plateau
    Noriyuki OOHIRA, Toshio UEDA, Kiyohiko WATANABE, Kenichiro MIZUNO, Ryu ...
    2003 Volume 45 Issue 1 Pages 81-96_1
    Published: March 05, 2003
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.81
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    2003 Volume 45 Issue 1 Pages 96-
    Published: 2003
    Released on J-STAGE: December 14, 2012
    DOIhttps://doi.org/10.5917/jagh1987.45.96
    JOURNAL FREE ACCESS
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    [in Japanese]
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