Abstract
This research clarifed the influence of cross-sectional shape of bridge piers and the inclination of bridge nose in the arch formation by the movement of ice sheets at the bridge piers through a systematic experiment. In addition, we made clear by an experiment that the sudden increase in river water at Kotonihassam River in Sapporo on Feb. 22, 1994 was due to the formations of the arch of ice sheets and ice jam and following collapse at the bridge pier.
