抄録
The rivers in Hokkaido, which are situated in a snowy and cold region, contain a large quantity of flowing frazil slush and accumulation of it.
We set an ice control structure to prevent inflax of frazil slush into the intake of hydroelectric power station for last three years.
This paper reports observation of hydraulic and meteorological conditions, the development of ice cover, velocity distribution under the ice cover and daily change of river discharge.
