Journal of the Japanese Society of Snow and Ice
Online ISSN : 1883-6267
Print ISSN : 0373-1006
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Volume 49, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • Estimates of snowmelt by a heat balance method
    Junsei KONDO, Takeshi YAMAZAKI
    1987 Volume 49 Issue 4 Pages 181-191
    Published: December 30, 1987
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.49.181
    JOURNAL FREE ACCESS
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    A heat balance method to estimate the amount of snowmelt has been developed and applied. (1) The solar radiation and the downward long wave radiation were observed as well as other meteorological parameters at Sawauchi, Iwate prefecture, for the spring of 1985. Using these data, the amount of snowmelt was calculated. The calculated values are roughly in agreement with the observed ones. (2) A method is shown to estimate the solar radiation and the downward long wave radiation from duration of sunshine. Using this method, the amount of snowmelt can be calculated for a region with no radiation data. (3) With application of the present heat balance method to the basin of River Waga, the integrated amount of snowmelt over an area of 583 km2 was estimated. The estimated value corresponds to the run-off measured at the site of Yuda Dam. (4) Several graphs of the amount of daily snowmelt versus several external parameters are presented.
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  • Studies of sea ice in the Okhotsk Sea by numerical model
    Kiyotomi SATO
    1987 Volume 49 Issue 4 Pages 193-201
    Published: December 30, 1987
    Released on J-STAGE: January 21, 2010
    DOIhttps://doi.org/10.5331/seppyo.49.193
    JOURNAL FREE ACCESS
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    The characteristics of sea ice in the Okhotsk Sea are studied by numerical calculation of the sea ice model. The model includes growth and melting of sea ice by thermodynamic processes and motion of sea ice by dynamic processes. In addition, ice and heat transport by the ocean current are considered. By numerical calculation of the sea ice model from October 15 to June 30 of the next year, the seasonal change of sea ice distribution in the Okhotsk sea is closely reproduced.
    The following results are obtained by numerical experiments. (1) Heat transport accounts largely for the difference in the ice edge distribution between the eastern and the western Okhotsk Sea. (2) The ice edge depends largely on the thermodynamic process, but little on the dynamic process. (3) On account of ice transport, the ice area where thickness is maximal approaches Hokkaido from the northern Okhotsk Sea as the season progresses.
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  • Control of snowmelt rate with foam cover
    Part 1 : Field experiment
    Teruyoshi UMEMURA, Yoshinobu TADA, Norio HAYAKAWA, Akiyoshi HONDA, Mas ...
    1987 Volume 49 Issue 4 Pages 203-210
    Published: December 30, 1987
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.49.203
    JOURNAL FREE ACCESS
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    A method of controlling snowmelt rate with use of gelatine-whipped foam on snowpack as an insulating cover has been applied to three field set-ups : natural snowcover, piled-up snowpack and snowpack stored in an underground tank.
    Snowmelt rate of 10.0 cm/day obtained for the natural snowcover without any insulation is reduced to 1.3 cm/day for the underground tank set-up with foam cover. This reduced value of snowmelt rate, if maintained till the melting is completed, suggests the possibility of storing snowpack until summer. The possible problem in achieving such a long period of storage is foreseen in the observation that the melt rate increases rapidly when deformation of snowpack becomes excessive after 20 to 30 days of melt period.
    This rapid increase in the melt rate is due to an interactive process of snowpack deformation and ablation of foamy material caused by warm draft.
    As for the melting snowpack in an underground tank, the change of water and air content in the snowpack as it floats in the tank is analyzed on the basis of the balance of heat and mass.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1987 Volume 49 Issue 4 Pages 211-214
    Published: December 30, 1987
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.49.211
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1987 Volume 49 Issue 4 Pages 215-216
    Published: December 30, 1987
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.49.215
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 49 Issue 4 Pages 217-220
    Published: December 30, 1987
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.5331/seppyo.49.217
    JOURNAL FREE ACCESS
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