Journal of the Japan Society of Erosion Control Engineering
Online ISSN : 2187-4654
Print ISSN : 0286-8385
ISSN-L : 0286-8385
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Volume 45, Issue 1
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 45 Issue 1 Pages 1-2
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.1
    JOURNAL FREE ACCESS
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  • Study on Conservation of Mountain Stream Environment with Consolidation Works
    Hirokazu KITAMURA
    1992 Volume 45 Issue 1 Pages 3-13
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.3
    JOURNAL FREE ACCESS
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    The space with which green and water harmonized came to be created in various places, where a regional inhabitant can take enriching and the relief by improving the safety of sediment disasters and maintaining a beautiful mountain stream environment. It is a present tendency to apply the logic which applies to equilibrium river to mountain stream uniformly, reproduce the environment according to the artificial fixation of the scene. However, a basic factor by which the environment created is different because of equilibrium river and mountain stream, therefore, it is necessary to maintain mountain stream environment by appropriate logic and the technology.
    Because of this point of view, the intent of this study is to reveal the ideas and methods for conservation of mountain stream with consolidation works.
    a) On mountain stream, the environment is being maintained by a natural action by which gravel area is maintained.
    b) It is time of L/b=2 that gravel area is maintained highest and is demonstrated the effect of consolidation works for erotion control at this time most.
    c) Therefore, it is suggested that sabo works should coexist with conservation of mountain stram environment by appropriately arranging consolidation works.
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  • Study on Prediction and Countermeasures of Flood Disasters caused by Landslide Dam Failures
    Yoshiharu ISHIKAWA, Michiya IRASAWA, Shang Fu KUANG
    1992 Volume 45 Issue 1 Pages 14-23
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.14
    JOURNAL FREE ACCESS
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    Landslide dams form in a wide range of physiographic settings. The most common types of mass movements that form landslide dams are slumps of rock and soil; ladslides; debris flow triggered by earthquakes and excessive rainfall. Most landslide dams are remarkably short-lived. When a landslide dam collapses or is overspilled, the sudden release of stored water augmented by higyly concentrated sediment due to rapid erosion of the dam body can lead to a flood which may cause a great destruction to property and potential loss of lives downstream.
    Prediction of maximum discharge and total sediment runoff of such a flood is essential to examine countermeasures, yet no comprehensive investigation has ever been undertaken. This paper, conceived in response to the importance of the problem, addresses the process of erosion of dam body and the sediment transport mechanisms, proposes a method to obtain the hydrograph and sediment concentration in the flow. Further, the results such as follows will be presented.
    1) Hydrographes of the flood discharges and the sediment transports due to landslide dam failures,
    2) Diagram for predicting the starting time of dam failures,
    3) Diagrams for predicting the peak discharge,
    4) Prediction method of inundated location and the evaluation of the dangerous rank,
    5) Countermeasures.
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  • Case Study on Socioeconomic Evaluation Methods for Sabo Works
    Michiya IRASAWA, Yoshiharu ISHIKAWA
    1992 Volume 45 Issue 1 Pages 24-28
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.24
    JOURNAL FREE ACCESS
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    So far the public works have developed the infrastructure by stressing their main role. However, in recent years, diversification of the nation's needs has become tending to demand a multi-socioeconomic effect in developing the infrastructure. In each tendency, it is necessary for the erosion control project to consider not only the disaster prevention effect, but also the social and economic effect. When these public works projects are viewed in perspective, it is required to evaluate these effects more rationally so as to develop the erosion control project.
    We took Asahi village in Yamagata prefecture as a case stydy area to try evaluating social effects of an erosion control projects, where the project plays an important role.
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  • Study on the Physical Properties of the Colluvium Soils in Yoshino River Basin
    Takaaki AMADA, Miturou UEMURA, Yukuo ABE
    1992 Volume 45 Issue 1 Pages 29-37
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.29
    JOURNAL FREE ACCESS
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    Investigation of soil properties from the view point of soil engineering are indispensable for plannig the landslide contorol measures.
    This paper present the experimental results on physical properties of soil in Yoshino River basin. Samples are classified as sandy silt by means of soils classification based on the grain size. The sorting of this soil is generally classified as “very poorly sorted”.
    The soil classification by means of plasticity chart indicates that 70% of the samples is inorganic clays of low or medium plasticity, of which 20% is inorganic silt of low or medium compressibility.
    Main clay minerals are mica chlorite in Sanbagawa zone and chlorite amphibole in Mikabu zone. The mica content has decisive influence on the compressibility and other properties of the soil. In Sanbagawa zone, the slope angls are comparatively steep but those of Mikabu zone are somewhat different. The landslide of Mikabu area resembles that of the Niigata area, but it can not be classified as the same category of Niigata by soil testings.
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  • Experimental Study on Purification Methods of Turbid Water
    Michiya IRASAWA, Yoshiharu ISHIKAWA, Yutaka KOIZUMI
    1992 Volume 45 Issue 1 Pages 38-42
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.38
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 45 Issue 1 Pages 43-51
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.43
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Sigechika MIYAJIMA
    1992 Volume 45 Issue 1 Pages 52-55_2
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.52
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1992 Volume 45 Issue 1 Pages 55
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.55
    JOURNAL FREE ACCESS
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  • Disasters caused by Debris Flows at Unzen-Fugen Volcano in March, 1992 and Countermeasures
    Hiroshi IKEYA, Yoshiharu ISHIKAWA
    1992 Volume 45 Issue 1 Pages 56-60_2
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.56
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 45 Issue 1 Pages 61-63
    Published: May 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.45.61
    JOURNAL FREE ACCESS
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