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 49, Issue 1
Displaying 1-5 of 5 articles from this issue
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  • An Advanced Slope Failure Hazard Mapping Method by Combing GIS and Hayashi's Quantification Methods Theory
    Guoyun ZHOU, Naomoichi YOKOYA, Guangqi CHENG, Yoshito KITAZONO
    2008 Volume 49 Issue 1 Pages 2-12
    Published: April 10, 2008
    Released on J-STAGE: November 04, 2011
    DOIhttps://doi.org/10.5110/jjseg.49.2
    JOURNAL FREE ACCESS
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    A new Geographical Information System (GIS) - based slope failure hazard mapping method using Hayashi's quantification methods theory is proposed and applied in a slope failure prone area in Minamata City of Kumamoto Prefecture. In the past, Hayashi's quantification methods theory is often used in slope failure hazard mapping, however, the preparation of larger spatial data is very hard and the work efficiency is low and reliability of the results are doubtful sometime. In this research a series of GIS-based spatial data preparation method is proposed for quantification methods theory analysis and the results of the analysis results can be input into GIS to make hazard map directly. The application of proposed method on Minamata area shows that created hazard map has good agreement with real slope failure condition.
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  • Development of an Acoustic Emission System with the Use of Active and Dummy Sensors and Its Application to the Landslide of Babadag Town in Turkey
    Taishi ABE, Hisataka TANO, AYDAN Omer
    2008 Volume 49 Issue 1 Pages 13-22
    Published: April 10, 2008
    Released on J-STAGE: November 04, 2011
    DOIhttps://doi.org/10.5110/jjseg.49.13
    JOURNAL FREE ACCESS
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    In this paper, a new acoustic emission system utilizing two AE sensors and its application to the field measurements are described. One of the sensors, called active AE sensor, is directly attached onto rock while the other one, called dummy AE sensor, is detached from the rock surface and set next to the active AE sensor. This AE counting system is named as AD system. The AD system measures acoustic emissions through the active and dummy sensors simultaneously. If AE signals counted by the dummy sensor, it is interpreted as noise signals and such AE counts is omitted from data counted by the active AE sensor. This method has been applied to the landslide of Babadag town in Turkey since 2001. It is shown that this AD system can increase the reliability of the AE field measurement.
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  • Analysis of Sediment Movement Caused by Debris Flow Using High-Resolution Satellite Imagery in the Xiao Xue River Watershed, Taiwan
    Takashi SHIRAISHI, Ken TSUTSUI, Hideaki NAKAGAWA, Tetsuro ESAKI
    2008 Volume 49 Issue 1 Pages 23-33
    Published: April 10, 2008
    Released on J-STAGE: November 04, 2011
    DOIhttps://doi.org/10.5110/jjseg.49.23
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    This research targets the debris flow caused by heavy rain by the Minddule, Aere Typhoons in July and August, 2004 in the Xiao Xue River Watershed (22.0km2) in middle portion of the Da-Chia River, Taiwan. The sediment movement area were extracted and divided into slope failure and river using the 5m mesh DEM made from high-resolution stereo satellite images and 2-dimentional satellite image analysis. The historical variation, sediment movement volume and topographical characteristics in the slope failure and river were analyzed. As a result, it was found that the collapsed sediment caused by the slope failures at the Chi-Chi Earthquake had accumulated in the bottom of slope or river and the accumulated sediment have flown down the slope and river and become debris flow by heavy rain caused by Minddule, Aere Typhoons and had led to big scale sediment disasters. The volume of sediment yield and the accumulated sediment in slope failures was 9, 814 thousand m3, 2, 898 thousand m3 respectively. The volume of scoured sediment and accumulated sediment in river was 1, 353 thousand m3, 2, 387 thousand m3 respectively. The volume of sediment discharge from the Xiao Xue River Watershed to the Da-Chia River was 5, 882 thousand m3. It is inferred that the analysis method proposed in this research will be a new effective method for sabo plans in a wide area.
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  • The Outcrop of the Median Tectonic Line Shobudani Fault which Appeared in the Construction Spot of Hashimoto City in Wakayama Prefecture, Southwest Japan
    Takayuki MATSUMOTO
    2008 Volume 49 Issue 1 Pages 34-37
    Published: April 10, 2008
    Released on J-STAGE: November 04, 2011
    DOIhttps://doi.org/10.5110/jjseg.49.34
    JOURNAL FREE ACCESS
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    Median Tectonic Line outcropped at Suda town in Hashimoto City, Wakayama Prefecture. In this outcrop, Izumi Group thrust up Shobudani Group. This thrust fault is Shobudani fault that acted at Early Quaternary. The short paper describes this outcrop, and is an examination of continuousness and the activity of the fault. The Shobudani fault perhaps converges with northern Gojodani fault in a deep part under the ground, and probably the fault activity becomes dull in about 0.8-0.7 Ma.
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  • Trends in Proposed Amendments to the Soil Contamination Countermeasures Law and Related Points at Issue
    Hiroshi TAKASHIMA
    2008 Volume 49 Issue 1 Pages 38-41
    Published: April 10, 2008
    Released on J-STAGE: November 04, 2011
    DOIhttps://doi.org/10.5110/jjseg.49.38
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