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 45, Issue 5
Displaying 1-4 of 4 articles from this issue
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  • Attempt to Evaluate the Effect of Groundwater Recharging through Paddy Fields in the North Part of Kanto Plain
    A Water Balance Analysis by the Storage Model
    Hiroaki NAKAMURA, Yoko HASHIMOTO, Fumiya OOTSUKA
    2004 Volume 45 Issue 5 Pages 224-237
    Published: December 10, 2004
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.45.224
    JOURNAL FREE ACCESS
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    It is a very important subject for the preservation as well as for the utilization of the groundwater to maintain sound water circulation to evaluate the role of the groundwater pumping for irrigation and the recharge through paddy fields. As case study, we selected the national irrigation project site. First we made a tank-modal to simulate present groundwater balance in the site. Based on the calibrated model, simulation was carried out for water-balance and water level fluctuation in two cases:
    ·Recharge through paddy fields is terminated.
    ·Pumping up is terminated.
    The analysis showed that the model evaluated the role of pumping up as well as of recharge through paddy fields in the water balance.
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  • Evaluation of Thermal Effects of Large-Scale Pyroclastic Flow Deposits on Basement Rocks by Fission-Track Method
    Tatsuji MATSUZAKI, Chifumi KAKUTA, Tsuneari ISHIMARU, Hiroki KAMATA, T ...
    2004 Volume 45 Issue 5 Pages 238-248
    Published: December 10, 2004
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.45.238
    JOURNAL FREE ACCESS
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    Large-scale pyroclastic-flow deposits cover much wider areas of basement rocks than those of typical scales and can reach several tens of kilometers from the source area. Examination of the thermal effects of pyroclastic-flow deposits on basement rocks is important in order to evaluate the long-term stability of the geological environment of basement rocks. We studied the thermal effects of pyroclastic-flow deposits on basement rocks using fission tracks and established a method to estimate the sub-surface thermal record and effects at depths. As an example, we estimated the thermal effects of the Imaichi pyroclastic flow deposits. Our results indicate that the temperature rose to 60°C at 100 m depth in the basement rocks covered by the pyroclastic-flow deposits.
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  • The Effectiveness and Issue of the Tomograph-analyzing Method Applied to the Existing Refraction Seismic Data: A Case of a Loosened Rock Mass Slope
    Working Group Examining Rock-mass Slide
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    2004 Volume 45 Issue 5 Pages 249-258
    Published: December 10, 2004
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.45.249
    JOURNAL FREE ACCESS
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    In order to select suitable sites for large-scale structures in mountainous and/or hilly areas, the slope stability of the sites will become an important issue to be investigated and clarified. The loosened rock mass slope generally occupies wide area and has indefinite topographic features, therefore geotechnical investigation in such an area with boring and adits requires large number of quantity and eventually necessitates much cost and time.
    In this research, existing refraction seismic data in the downstream area from Tomata dam site are re-analyzed with recently introduced technique of tomograph-analyzing method. The results obtained here are compared with the detailed loosened rock mass condition analyzed by many boring and adits data, we have clarified that specific velocity layer patterns composed of a series of concave structures emerge at the top of loosened area in the rock mass slope. In identifying these specific velocity layer patterns, it is possible to distinguish loosened rock mass slope from rock-mass slide slope, and decrease the cost and time of geotechnical investigation. It is difficult, however, to identify the bottom boundary of loosened area in rock mass slope by using tomograph-analyzing method only. In such a case, this research shows that the borehole-to-surface transmission tomography should be applied to determine this bottom boundary.
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  • Liquefaction on the Valley Filling Embankment Caused by the Tokachi-oki Earthquake in 2003, Hokkaido, Japan
    Sakae MUKOYAMA, Hisashi SASAKI, Tomoyuki TAKAMI, Yoshinori KOYAMA, Sat ...
    2004 Volume 45 Issue 5 Pages 259-268
    Published: December 10, 2004
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.45.259
    JOURNAL FREE ACCESS
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    The liquefaction and slope disaster by The Tokachi-oki Earthquake (Mj8.0) on September 26, 2003, occurred at valley filling reclaimed farmland in Tanno-cho, Hokkaido. It is noticeable that a comparatively large liquefaction (about 6, 000-10, 000m3) occurred on the hill at 230km distant from the epicenter. It is presumed that mobilized sand (6, 000m3 or more) may be pressed out from several craters without downslope movement of the cave-in surface mass, and the cave-in accompanied by surface cracks arose after that. In this investigation, a field survey, aerial photo survey, airborne laser scanner survey and GIS analysis of land use were carried out and it is thought effective for distinction of artificial land form to use high-resolution DEM by airborne laser scanner survey.
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