Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 15, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • Fluorescent Dye Approach to Identify Grout Injected into Fissures with High Accuracy
    Michinao TERADA, Hajime HAMADA, Takashi NISHIYAMA, Hiromi ICHIMARU
    2005 Volume 15 Issue 3 Pages 189-199
    Published: 2005
    Released on J-STAGE: January 11, 2008
    DOIhttps://doi.org/10.11315/jsde.15.189
    JOURNAL FREE ACCESS
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    A new fluorescent approach was developed to visualize the cracks filled with grout on the bore-hole wall and was applied to the water interception grout test in the dam site. As the result, it was proven that the infiltration behavior of the grout was surely grasped. By applying the fluorescent of the color which differs for the every grouting stage, the relationship between the various conditions of grouting (concentration of grout, sequence of grout and so on) and the infiltration direction of grout, the infiltration range of grout were also clarified. It was considered that the useful information for design and construction of the grouting has been brought from this method.
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  • Study on Reservoir Sediment Excavation Management and Sediment Replenishment to Downstream Rivers
    Masahisa OKANO, Mikio KIKUI, Hiroya ISHIDA, Tetsuya SUMI
    2005 Volume 15 Issue 3 Pages 200-215
    Published: 2005
    Released on J-STAGE: January 11, 2008
    DOIhttps://doi.org/10.11315/jsde.15.200
    JOURNAL FREE ACCESS
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    Comprehensive sediment management in reservoirs is required to preserve the capabilities of water resources facilities and to conserve the environment in rivers and coastal areas downstream of the reservoir. As one means of achieving the goals, ‘sediment replenishment’ has been carried out to excavate some of the sediment deposited in reservoirs, transport it to downstream of the dam, and discharge it into downstream rivers and finally into the sea with floodwater. This paper identifies the characteristics of sediment deposited in the Sakuma Dam reservoir in the Tenryu River and discusses the effects of ‘sediment replenishment’ on river bed changes. One dimensional numerical simulation shows that appropriate sediment excavation from the upper part of the Sakuma Dam reservoir and sediment supply to downstream rivers will contribute to maintaining both reservoir and river bed levels, and mitigating the armoring of river bed materials in rivers downstream of the Akiha and Funagira Dams. Consensus building among several stake-holders should be necessary to continue sediment replenishment for a long time successfully.
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  • Experiments on the Application of Cross-flow Water Turbines to Open Channel Flow
    Shinya UMEDA, Hideaki KAWASAKI, Nario YASUDA, Yousuke TOMIZAWA, Hajime ...
    2005 Volume 15 Issue 3 Pages 216-226
    Published: 2005
    Released on J-STAGE: January 11, 2008
    DOIhttps://doi.org/10.11315/jsde.15.216
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    This paper presents the experimental investigation on the cross-flow water turbine for utilizing water power generation in open channel flow. The water turbine without using headrace pipe is proposed for taking the application to the free flows in the existing water-use facilities into account. Therefore, the turbine system which consists of a runner and small intake casings is able to become much smaller than the conventional one. The turbine performance tests were carried out on two forms of the runner setting where the runner is lying or standing on the channel bed. The generating power, the water elevation and the turbine efficiency were examined to understand the relationship between the turbine performance and the flow feature. It was found that the lying turbine generates high power in a low number range of rotations where the turbine makes a large elevation of upstream water level into large effective head. In contrast, the standing turbine works well in a high number range of rotations with large effective head. The maximum efficiency of the present cross-flow turbines is nearly as large as that of the current water wheel which is widely used for open channel flows.
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  • Case Study on Seismic Resistant Reinforcement of Old Fill Dam Embankment Using Cement-mixed Muddy Soil
    Akira KITAJIMA, Shigeru TANI, Shinji FUKUSHIMA, Kouji NISHIMOTO
    2005 Volume 15 Issue 3 Pages 227-240
    Published: 2005
    Released on J-STAGE: January 11, 2008
    DOIhttps://doi.org/10.11315/jsde.15.227
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    Most of old fill-dams were mostly accumulated with the muddy soil in reservoir that caused the water pollution and the loss of reserved water. In order to make efficient use of the muddy soil as the embankment soil for reinforcing the damaged small earth dam embankment, we have developed a new type method to repair the old small earth dam embankment by means of the stabilized muddy soil with cement stabilizer. This repairing method is applicable to the reinforcement of the fill-dam embankment (embankment height H ≥ 15 m) larger than the small earth dam embankment (H < 15 m). In this paper, we represent the example that repaired an old fill-dam embankment for seismic-resistant reinforcement by applying the method developed by us.
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