Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 21, Issue 4
Displaying 1-5 of 5 articles from this issue
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  • Research on Risk Management of Dam Flood Control by Utilizing Rainfall Prediction
    Shinya MITSUISHI, Tetsuya SUMI, Toshihisa OZEKI, Takuya YAGAMI
    2011 Volume 21 Issue 4 Pages 242-250
    Published: December 15, 2011
    Released on J-STAGE: December 23, 2011
    DOIhttps://doi.org/10.11315/jsde.21.242
    JOURNAL FREE ACCESS
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    Recently, the rainfall prediction technology utilizing numerical meteorological models have been advanced remarkably. In case of extreme flood events at some of dams, preliminary discharge and/or over-cutting flood control operations which reduce outflow discharge more than regulated are executed and recognized as considerably effective flood mitigation measures. This paper studied the risk management of rainfall prediction errors required for implementing stable and reliable flood control operations. By comparing the predicted and observed rainfalls, errors of the upper limit and the lower limit are clarified and how to define acceptable error margins regarding flood control and water use are proposed. In addition, numerical simulations are executed by applying it to the past flood control records and the method of calculating the optimal operation is confirmed.
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  • Development of A Wireless Sensor System for Ground Displacement Monitoring and Its Performance Test in A Dam Construction Site
    Yukio SHIBA, Mai SAWADA, Masayuki SAEKI, Toru ICHIZAWA
    2011 Volume 21 Issue 4 Pages 251-262
    Published: December 15, 2011
    Released on J-STAGE: December 23, 2011
    DOIhttps://doi.org/10.11315/jsde.21.251
    JOURNAL FREE ACCESS
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    Monitoring orobservation with use of sensors which is distributed over a large constructionsite needs cables of great length and takes a lot of labor and trouble. Thispaper reports a wireless sensor system for monitoring ground displacement whichhas been newly developed by combining GPS receiver and wireless sensortechnology. The wireless sensor is so designed that has a radio communicationdistance of several hundreds meters, is battery-operated for over a month, andcan observe ground displacement with about the same precision as existing wiredmonitoring system using GPS. Performance test on the prototype sensor systemhas been conducted in a dam construction site, and expected performance hasbeen verified.
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  • Proposal for Selection of Minimum Necessary Measuring Points for Appropriate Safety Management of Concrete Gravity Dams
    Yoshikazu YAMAGUCHI, Toshihide KOBORI
    2011 Volume 21 Issue 4 Pages 263-271
    Published: December 15, 2011
    Released on J-STAGE: December 23, 2011
    DOIhttps://doi.org/10.11315/jsde.21.263
    JOURNAL FREE ACCESS
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    Existing damsmust be effectively used as a valuable stock of infrastructure. Appropriatemaintenance and safety management of dams are therefore essential. For thesafety management of existing dams in Japan, according to the Japanese damsafety management regulation, leakage/seepage, deformation, uplift/pore waterpressure, and so on are measured. Our investigation revealed that some old damsterminated the measurement for safety management without appropriatemaintenance and repair. In this technical note, we propose selection method ofminimum necessary measuring points for appropriate safety management ofconcrete gravity dams.
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  • Comparison of In-Stream Flood Mitigation Dams in Austria and Japan
    Akio SHIRAI, Yoichi IWAMI, Tetsuya SUMI
    2011 Volume 21 Issue 4 Pages 272-277
    Published: December 15, 2011
    Released on J-STAGE: December 23, 2011
    DOIhttps://doi.org/10.11315/jsde.21.272
    JOURNAL FREE ACCESS
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    There are more than100 in-stream flood mitigation dams in Styrian state, Austria. We investigated 11of those dams in November, 2009. In this paperreport, we studied about riverbed sediment materials by comparing with ones in Japan. Thereis occasionally some difference in riverbed sediment materials between upstreamand downstream of one dams. Itis similar also in Austria and Japan. Geographicalfeature on the flood control basin is thought to be as oneof the reasonscauses similarlyin Austria and Japan. Creating lTheconsideration such as installing the low-water channelsin the flood control basin can beis effectivenecessary to secure the continuityousnessof the sediment transport.
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