Author(s): H. Kasai; M. Yamazaki; K. Hirayama
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Keywords: No Keywords
Abstract: The cold region river produces various ice formations during winter period. Typical frazil ice problems have occurred in the hydropower stations and water supplies in Hokkaido. We have investigated the relationship between meteorological factors and frazil problems at the three observation sites, the Asahikawa City Water Services, the Setose Power Station, and the Niupugawa Power Station. We can classify representative two types of weather conditions from these data. One is Clear weather type with radiative cooling, calm wind, and cold night for a few clear sky days. The standard of the daily minimum air temperature is 15°C below zero. The other is Blizzard type with strong wind, heavy snow, and low air temperature for a few days due to a growth of low atmospheric pressure and a passage of cold front from west to east in Hokkaido. In this paper, meteorological and hydrological conditions related to frazil ice problems occurred recently in Hokkaido are discussed.
Year: 2002