Author(s): Shinji Kioka; Daisuke Honma; Yasuji Yamamoto; Michihiro Nishida; Takashi Terashima
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Abstract: Weather observation was conducted at Otsu Fishing Port facing the Pacific Ocean in the eastern part of Hokkaido, which suffers serious damage from freezing nearly every year, in the winter of 2002 to 2003. The negative total heat flux (total heat loss) was the highest from early dawn to dawn, proving the acceleration of freezing early in the morning. Also, in comparing the absolute value of each heat flux at there, that of the net solar radiation was highest, followed by the net long-wave radiation, sensible heat flux and latent heat flux. The percentage of the net long-wave radiation (long-wave backward radiation) was the highest in terms of total heat loss at over 50%. Also, as a result of an on-site survey of the rates of frazil ice production with the intention of removing frazil ice as a measure against port freezing, it was confirmed that frazil ice production was highly dependent on not only heat flux, but also on the physical action of wind that controlled the heat release area of the water surface.
Year: 2004