Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
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Volume 27, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • A New Hydrographical Model for the Unconfined Groundwater Basin
    Hiroshi HOSOTANI, Yoshihiko ITO
    1986 Volume 27 Issue 2 Pages 53-60
    Published: June 30, 1986
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.27.53
    JOURNAL FREE ACCESS
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    A Kagoshima prefecture, very simple numerical model for the hydrological analysis of Wantoubaru groundwater basin, Kikaijima island, is proposed.
    The hydrogeological setting of the basin is as follows; the basement rock of the basin is mudstone of the Shimajiri Group (Pliocene-Pleistocene) and the aquifer is limestone of the Ryukyu Group (Pleistocene). The limestone is very permeable and forms many caves or holes, therefore all the rainfall on the basin permeates down into this limestone or these holes and it is added straight to groundwater. And the groundwater in the limestone rapidly flows downstream in the basin.
    The proposed numerical model represents unsaturated permeable flow (vertical flow) and saturated groundwater flow (horizontal flow). The vertical flow model is reformed from Sugawara's tank model and the vertical permeability coefficient (Kv) is related to the runoff coefficient of a tank (a) by the following equation,
    Kv=1.443·a·l,
    where l is the distance between the surface and the groundwater level. And the horizontal flow model is based on the Darcy's law.
    When we apply this model to Wantoubaru basin, the vertical flow model may be splitted into two tanks; one of them represents limestone which has many small cracks, and another represents caves or holes. The vertical permeability co-efficient of the former tank is obtained from the data of the pumping tests at Minafuku experimental subsurface-dam in Miyakojima island, Okinawa prefecture. The coefficient of the latter is obtained from the span between a peak of rainfall and the corresponding peak of groundwater level. The horizontal permeability coefficient is obtained from the data of pumping tests in Miyakojima and Kikajima island.
    The result of the calculation by this model is agreed with the observed groundwater level. Therefore, we may be able to use this model for the analysis of unconfined groundwater.
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  • Judgement of Frost Heaving of Rocks by Freezing Test
    Shuzo KITAGAWA, Yoshiteru KAWAKAMI
    1986 Volume 27 Issue 2 Pages 61-70_1
    Published: June 30, 1986
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.27.61
    JOURNAL FREE ACCESS
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    There are some tunnels which have been deformed by frost heaving of rock behind the lining. We already reported about the common features in mode and progress of their deformations. This paper describes the geological conditions of frost heaving rocks which were detected in freezing test of rocks. For unconsolidated earth the past results of studies about frost heaving of soil generally apply, and concerning consolidated earth their strength and grain size distribution of rock are found the most effective indexes for judgment of frost heaving.
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  • Studies on the Dabris-flow in Rokko District (Part 1)
    Hirotaka SOKOBIKI, Sumiji KOBASHI, Toshiyuki HABARA
    1986 Volume 27 Issue 2 Pages 71-79
    Published: June 30, 1986
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.27.71
    JOURNAL FREE ACCESS
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    Slope failure and land-slide as geologic hazard have been studied in numerous districts up to the present based on the examinations of both the topographical and geological environments. Concerning debris flows, on the other hand, only a few researches have been reported from the same viewpoint. This is because the debris flow has been occurred in the relatively spreading space-time regions concerning topography and geology.
    In this paper, debris flows occurred in Rokko district on July, 1967 were examined in detail based on the concept of “drainage system”from topographical and geological viewpoints. The results clearly indicate that the debris flow occurs at the null order streames and develops downstream systematically to the higher order one.
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  • Mapping Information Management System of Earthquake Research Institute
    Sumiko HIYAMA, Yoshiko KOTAKE
    1986 Volume 27 Issue 2 Pages 80-88
    Published: June 30, 1986
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.27.80
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 27 Issue 2 Pages 89-96
    Published: June 30, 1986
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.27.89
    JOURNAL FREE ACCESS
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