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 48, Issue 4
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 48 Issue 4 Pages 1-2
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_1
    JOURNAL FREE ACCESS
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  • Theoretical Approach to Evaluation on Reinforcement Material for Stabilization of a Slope
    Hiroyuki NAKAMURA, Mitsunori MASANO
    1995 Volume 48 Issue 4 Pages 3-10
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_3
    JOURNAL FREE ACCESS
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    Recently reinforced earth works are often used for the stabilization of a slope. These works are carried out to improve slope stability by the insertion of reinforcement materials in a slope. The Autors propose a new theoretical method to evaluate the effect of reinforcemnt materials-steel bars for improvement of slope stability. The increment of the resisting force along a failure surface in a slope has a cross relation to the apparent friction coefficient between soils and the reinforcement, and also the stiffness. Analyses on several model slopes have been done to make clear the effect of the reinforcement on slope stability by varying the diameter of the reinforcement friction between soils and the reinforcement, and its modulus elasticity.
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  • Supply and Transfer of Oxygen in Natural Stream Water Body by Reaeration
    Hirokazu KITAMURA
    1995 Volume 48 Issue 4 Pages 11-19
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_11
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    In mountain streams, the supply of oxygen from atmosphere to water body, which is called reaeration, would be accelerated due to the disturbance of the water surface with water falls and rapids. Oxygen is not only essential to all forms of aquatic life but also contributes to the degradation of the organic matter in the water body. Thus, reaeration is the self-purification process in the streams, and, therefore, it is one of the most significant aquatic environments which must be preserved in erosion control works.
    Our accumulated data indicates the following: (1) the high rate of reaeration occurres during high discharge and high temperature when the saturated concentration of dissolved oxygen is low, (2) the increasing degree of reaeration depends on the disturbed area of the water surface, which is in proportion to the amount of potential energy of falling water, and (3) the maximum degree of reaeration occurres within 100 seconds of residence time determined by the topographical volume of pools because of convective mass transfer pattern, and after 100 seconds of residence time lateral movement of dissolved oxygen is dominant due to diffusive mass transfer pattern.
    Consequently, reaeration in natural streams depends on a combination of environmental factors such as temperature and discharge, and topographical conditions such as water depth, river width and head. Conservation and effective use of the self-purification process in natural streams will, therefore, be possible with erosion control techniques incorporating these factors skillfully.
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  • Evaluation of the Shirasu Slope Stability Using Soil Hardness Values
    Katsuo SASAHARA, Kazushige EBIHARA, Ryousuke TSUNAKI
    1995 Volume 48 Issue 4 Pages 20-24
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_20
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    In order to establish the method to estimate the stability of the Shirasu slope, relationships between soil hardness and physical properties, and strength characteristics of Shirasu were examined.
    As a result, the facts mentioned below were made clear.
    1) Soil hardness value measured by the Yamanaka-type Soil Hardness Tester is more fitted than Nc-value measured by the conventional penetrometers for slope survey to estimate the strength characteristics of the undisturbed Shirasu because of the small penetration energy.
    2) Because of the initial structural anisotropy, soil hardness value measured in a horizontal direction is larger than that measured in a vertical direction.
    3) The density of soil particles and the particle size distribution is almost same even if soil hardness value of the undisturbed Shirasu is different, while the void ratio, the unit weight of the undisturbed Shirasu is different when soil hardness is changing.
    4) Relationships between soil hardness value and the value of Cd, φd by CD triaxial compression test is very clear.
    5) Relationship between soil hardness value and the measured slopes of actual slip surface is well simulated when stable slope is calculated using relationships between soil hardness value and physical, strength properties of Shirasu.
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  • The Erosion-Control Masonry Sabo Dam (Sunadome in Fukuyama Han) and its Environmental Complete Equipment Plan
    Kazuyuki TAKANASHI, Hidetoshi HANAFUSA
    1995 Volume 48 Issue 4 Pages 25-32
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_25
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    There are many Masonry Sabo Dams called Sunadome from ancient times in Fukuyama city, Kannabe town in the eastern Hiroshima prefecture.
    We have comparatively little rain, but much of debris flows due to geographical features in case of long rain in this district. Before, some of these dams were reported at Journal of Japan Society of Erosion Control Engineering in 1977. Historically and structurally, we enforced investigation again in 1994 including other undiscovered dams for environmental complete equipment and regional promotion.
    So we can say that Sunadome in Fukuyama Han was constructed from the period Edo for protecting human life against debris flows and floods, and original form of Sabo Dam in Japan.
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 48 Issue 4 Pages 33-42
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_33
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  • [title in Japanese]
    Hajime NAKAJIMA, Hirotaka SOKOBIKI
    1995 Volume 48 Issue 4 Pages 43-48
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_43
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  • Volcanoes of Alaska and Cascade Range in the United States
    Takashi YAMADA
    1995 Volume 48 Issue 4 Pages 49-57
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_49
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1995 Volume 48 Issue 4 Pages 58-62
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_58
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 48 Issue 4 Pages 63-65
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_63
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 48 Issue 4 Pages 66-68_2
    Published: November 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11475/sabo1973.48.4_66
    JOURNAL FREE ACCESS
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