Journal of the Japan Society of Erosion Control Engineering
Online ISSN : 2187-4654
Print ISSN : 0286-8385
ISSN-L : 0286-8385
Volume 45, Issue 5
Displaying 1-11 of 11 articles from this issue
  • [in Japanese]
    1993 Volume 45 Issue 5 Pages 1-2
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (347K)
  • Junichi KURIHARA, Kiyoo IDO
    1993 Volume 45 Issue 5 Pages 3-10
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Allowable sediment discharge is the sediment discharge that does not cause hazardous aggradation and keeps riverbed elevation. Sabo plan has been considered mainly from a point of view of causing sedimentrelated disasters.
    It, however, shoud be also considered from a point of view of water utilization and river environment.
    In this paper, the past data of riverbed elevation change in the Joganji River was analyzed and computer simulation was carried out for about three cases; (1) the present condition, (2) with closed type sabo dams (most commonly dams), (3) with slit type sabo dams. It was made clear that slit type sabo dams are effective to maintain the present riverbed conditions.
    Download PDF (1001K)
  • Yasuo MIYABUCHI
    1993 Volume 45 Issue 5 Pages 11-16
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    This paper describes debris movement due to heavy rainfall during snowmelt season in gullies of Tarumae Volcano, Hokkaido, northern Japan. A large amount of debris derived from slope surface, which had been loosen by freeze-thaw cycles, resulting from the heavy rainfall (total 162 mm) on April 22-23, 1990, deposited on valley bottom covered with snow. This debris was saturated by snowmelt water, thus turned into debris flow. The debris flows transported and deposited 340 m3 of fine materials (clay, silt, sand) with little coarse gravels. The sediment volume produced by this rainfall from slope surface was 400 m3. The volume is one order of magnitude greater in spring than in summer and in early winter. The return period of debris movement was estimated to be five years on the basis of the record of precipitation. The heavy rainfall during snowmelt season seems to play an important role on sediment production and transport processes in snowy subpolar zone.
    Download PDF (4849K)
  • Takahisa MIZUYAMA, Shinji EGASHIRA, Iwao MIYOSHI
    1993 Volume 45 Issue 5 Pages 17-19
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (8307K)
  • Takahisa MIZUYAMA
    1993 Volume 45 Issue 5 Pages 20-21
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (5371K)
  • [in Japanese]
    1993 Volume 45 Issue 5 Pages 22-27
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (755K)
  • Stanimir KOSTADINOV
    1993 Volume 45 Issue 5 Pages 28-33
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Slope of siltation is a very important parameter necessary in the designing of torrential flow regulation works. There is a series of formulas for its determination, and most of them are based on well-known Thiéry's formula boundary water velocity for bed load movement. Due to some difficulties in determining the acceptable amounts of the parameters, all the methods are rather unsuitable in practical calculations.
    That is why, in the forecasting of slope of siltation the most exact results are obtained from analytical correlations determined on the basis of really formed slope of siltation in the field.
    Based on the study of the slope of siltation on 35 check dams in the torrents in South-East Serbia the significant correlation between the slope of siltation and the some hydraulic characteristics of torrential flows (torrent-bed slope and the bed-load size in torrential flows) has been observed.
    The natural torrent-bed slope (Jt) and the bed-load sizes have been considered as the hydraulic characteristics. Bed-load sizes have been expressed by the sizes of the characteristics diameters: d10, d30, d50, d60 as well as the value of the coefficient of bed-load, heterogeneousness-U.
    U=d60/d10
    Based on the statistical analysis, the paper represents regional analytical correlations for the forecast of the slope of siltation (Jz) depending on the torrent-bed slope (Jt) and the bed-load size in torrential flows: the following analytical correlations have been suggested:
    a) Jz=0.46877Jt+0.21226
    b) Jz=0.46514Jt+0.00673U+0.20278
    c) Jz=0.45746Jt-0.01298d10+0.01611d30-0.00797d50+0.52412
    d) Jz=0.45912Jt-0.0135d10+0.01666d30-0.00872d50-0.00444U+0.61838
    The expression under “a” should be preferred.
    Download PDF (708K)
  • Case Study and its Future
    Kiyoshi HONDA
    1993 Volume 45 Issue 5 Pages 34-41
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (3283K)
  • Kenji NAGATA
    1993 Volume 45 Issue 5 Pages 42-47
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (11026K)
  • Libor JANSKY
    1993 Volume 45 Issue 5 Pages 48-53
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    SMODERP model for determination of surface runoff and erosion process is being developed recently in Czechoslovakia as one of the future erosion prediction methods. To prove that it is not of these models which are limited only to research applications and to examine its level of universality, model is being presently tested both, in the country of origin and in other regions in the world-now in Japan.
    Preliminary results shown that calculations correlated with measured data even if the existence of different rain and soil conditions must be taken into consideration. Model works when the investigated slope is divided into homogenous segments with regard to morphological, soil and vegetational conditions. The maximum length and width of the slope could be 1, 000 m; the minimum length and width of the slops could be 10 m, but the length of 20 m is better because to avoid oscillation of runoff in simulation stepe. In case that the actual values like hydraulic conductivity, soil sorptivity, potential interception, Manning's roughness coefficient for surface runoff are not available, recommended values of those parameters, developed on the basis of laboratory and field research experiments, are suitable enough for calculations. It seems that SMODERP model can be especially used to estimate soil erosion rates needed to plan conservation practices and developed soil conservation policy.
    Download PDF (3328K)
  • [in Japanese]
    1993 Volume 45 Issue 5 Pages 54-55_2
    Published: January 15, 1993
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (11340K)
feedback
Top