Abstract
In order to avoid facility destructions and operation troubles due to freezing, water intake gates of dams in the cold areas commonly adopt air bubble jet circulation systems which replace cold water at surface layer with warm water at bottom layer. Very small number of studies have been conducted on the circulation systems and the phenomena have not been cleared enough. The present paper applies a numerical simulation method based on turbulent model to a quantitative evaluation of the phenomena. A full scale test in a dock at a shipyard and a field test at Tokachi Dam were conducted, and the simulation results of heat-flow induced by air bubble jet are verified by the experimental results. A calculation method of ice melting process is obtained on the basis of the experimental data at Kanayama Dam, and a more reasonable design of water intake gates becomes possible.
