Journal of the Japanese Society of Snow and Ice
Online ISSN : 1883-6267
Print ISSN : 0373-1006
Search
Advanced search
OR
Browse
Search
Volume 54, Issue 3
Displaying 1-5 of 5 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Development of snow accretion forecasting system
    Teruhiko TANAKA, Yoshiji OHTUBO, Hirokazu OHKUBO, Masafumi MURAKAMI, K ...
    1992 Volume 54 Issue 3 Pages 245-257
    Published: September 30, 1992
    Released on J-STAGE: February 05, 2010
    DOIhttps://doi.org/10.5331/seppyo.54.245
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Forecasting system to predict occurrence of snow accretion on power transmission lines in the South-west Kanto district was produced. This system was produced by the analysis of the past examples of severe disasters of snow accretion, caused by extratropical cyclones and satisfies the following;
    (1)it can be operated with small amount of data which is available easily,
    (2)it can be run easily on a micro computer, selecting from a menu on the screen,
    (3)it can predict amount of snow accretion at each tower location,
    (4) each stage of the system can be improved with newly analyzed data.
    The program language is BASIC, making the system operable with a commercial personal computer.
    Verification of this system for the cases of a typical extratropical cyclone of the past was carried out, and for the recent cases of snowfalls caused by an extratropical cyclone during 3 winters in 1987-90. Evaluation of the prediction results led to some points to be improved and a guideline of realtime operation was obtained.
    For a future work, together with improving accuracy of prediction, the system will be advanced to the operational stage after trial operations by receiving weather fax-data and carrying out estimation in winter.
    View full abstract
    Download PDF (4089K)
  • Development of snow-fraction control technique in hydraulic conveying of snow
    Part II: Computer simulation
    Takuo KITAHARA, Yoshiaki SATO, Masataka SHIRAKASHI, Akira OKADA, Teruy ...
    1992 Volume 54 Issue 3 Pages 259-267
    Published: September 30, 1992
    Released on J-STAGE: August 07, 2009
    DOIhttps://doi.org/10.5331/seppyo.54.259
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The previous report (Part I) confirmed experimentally that snow can be conveyed stably and continuously with a preset value of snow-fraction. The present work describes a computer simulation program which enables one to investigate the situations differing from the experimental conditions. Using this program, the operating characteristics of the system was tested. It was confirmed that it is possible to control the snow-fraction in the pipeline to a preset value even if the fraction at the inlet shows a moderate fluctuation with time and that the control system works well for a pipeline with a practical length, say 1000 m. The study concludes usefulness of the snow-fraction control technique developed herein.
    View full abstract
    Download PDF (927K)
  • Snow adhesion roof sheets at sub-freezing temperatures
    Masujiro SHIMIZU, Tadashi KIMURA
    1992 Volume 54 Issue 3 Pages 269-275
    Published: September 30, 1992
    Released on J-STAGE: February 05, 2010
    DOIhttps://doi.org/10.5331/seppyo.54.269
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Shear strength has been measured experimentally at the interface between roof materials and snow adhering to them. Four kinds of roof materials were used: fluorocarbon polymers laminated steel sheet, stainless-steel sheet polyvinyl chloride laminated steel sheet, and colored zinc-coated steel sheet. It was found that the strength decreased with the above order of the materials for a given condition. Increase of shear strength F was found by extending the duration of snow adhesion, t, and the following empirical equation was obtained: F=atb, where a and b are constants. Snow type also affects the strength. Thus it was found that the shear strength is inversely proportional to the particle size and proportional to the 1.3-th power of the density of the adhering snow. Measurements with the new snow on the real roof of polyvinyl chloride laminated steel sheet indicated that the shear strength is larger than the gravity force, and the roof snow would not slide, with the roof slope less than 25°.
    View full abstract
    Download PDF (992K)
  • Dynamics of snow avalanches and mathematical models
    Yasuaki NOHGUCHI
    1992 Volume 54 Issue 3 Pages 277-285
    Published: September 30, 1992
    Released on J-STAGE: February 05, 2010
    DOIhttps://doi.org/10.5331/seppyo.54.277
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    [in Japanese]
    View full abstract
    Download PDF (1057K)
  • Numerical simulation of snowdrift
    Takahiko UEMATSU
    1992 Volume 54 Issue 3 Pages 287-289
    Published: September 30, 1992
    Released on J-STAGE: August 07, 2009
    DOIhttps://doi.org/10.5331/seppyo.54.287
    JOURNAL FREE ACCESS
    Download PDF (1480K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top