Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 25, Issue 4
Displaying 1-3 of 3 articles from this issue
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  • Experimental Model of Discharge Judgment Support Tool with “Minimum Necessary Discharge Table” —For the Effective Use of Flood Control Capacity in the Ohno Dam—
    Tadanori KUBOZONO
    2015 Volume 25 Issue 4 Pages 206-217
    Published: December 16, 2015
    Released on J-STAGE: January 06, 2016
    DOIhttps://doi.org/10.11315/jsde.25.206
    JOURNAL FREE ACCESS
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    As the frequency of local heavy rain increases due to recent climate change, existing dams are required to have flexible control systems in place which take into account the conditions of downstream rivers. In this article, I will introduce a judgment support tool to decide optimum outflow discharge from a dam. In conjunction with the “minimum necessary discharge table”, this tool utilizes the reservoir flood control volume effectively by implementing flood control operation in a planned scale and lowering downstream river water levels while ensuring the safety of the dam. I will also present a case study for this operation.
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  • Temporal Change of Propagation Time of Seismic Waves Estimated from Long-Term Earthquake Observation Records at Rockfill Dam
    Hidenori MOGI, Hideji KAWAKAMI, Yusuke ODA, Tatsuo OHMACHI
    2015 Volume 25 Issue 4 Pages 218-229
    Published: December 16, 2015
    Released on J-STAGE: January 06, 2016
    DOIhttps://doi.org/10.11315/jsde.25.218
    JOURNAL FREE ACCESS
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    We conducted Normalized Input-Output Minimization (NIOM) method for the long-term earthquake observation records at Aratozawa Dam located in Miyagi Prefecture, and examined the temporal changes of the propagation time of seismic waves in the dam body. The examinations revealed that (1) the S-wave propagation time observed during the 2008 Iwate-Miyagi Nairiku earthquake showed an abrupt increase due to the nonlinear behavior of the dam body; (2) a similar increase was observed during the 2011 off the Pacific coast of Tohoku earthquake, however, the amount of the increase was smaller than that found during the Iwate-Miyagi Nairiku earthquake, and the effects to the dam body due to the Tohoku earthquake was not significant; and (3) a gradual decrease of the propagation times proportional to the logarithms of lapse time was observed after the mainshocks of the 2008 Iwate-Miyagi Nairiku earthquake and the 2011 off the Pacific coast of Tohoku earthquake.
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  • Study on Dynamic Deformation Property of Rock-Fill Dam by the Earthquake Records
    Nobuteru SATO, Hideki SODA, Akio SAI
    2015 Volume 25 Issue 4 Pages 230-239
    Published: December 16, 2015
    Released on J-STAGE: January 06, 2016
    DOIhttps://doi.org/10.11315/jsde.25.230
    JOURNAL FREE ACCESS
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    Characteristics of seismic records between dam crest and its foundation contains dynamic property of the dam body. Focusing on the dynamic characteristics indicated by the earthquake record, authors estimated dynamic deformation property of dam body from actual earthquake records of rock-fill dam. And using the obtained dynamic deformation properties, reproduction analysis of rock-fill dam under the strong ground motion of Iwate Miyagi Inland Earthquake was performed and examined its applicability. This paper shows important point to set the dynamic deformation characteristics of embankment of the existing rock-fill dam.
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