The hydraulic characteristics of an ice-covered river is much different from those at other seasons, because the frictional resistance between water surface and icesheet increases due to the ice cover on the water surface.
Accuracy of estimation of the average velocity is dependent on the velocity profile. Usually, the k-ε model is used to estimate the velocity profile under ice cover. This paper verifies a new estimation of a velocity profile under ice, the Two-Power LAW, using data measured in Hokkaido.