晶氷の氷化を考慮した氷厚変動計算手法の一提案

抄録

In this study, the behavior of ice plates and frazil were clarified by categorizing temporal changes based on the results of field observation conducted at the Shokotsu and Yubetsu rivers in Hokkaido. Of particular note in this study was the indication of the possible contribution of frazil-to-ice transition to the formation of ice plates. A method for calculating ice thickness variation considering such transition was developed, and the validity of the calculated values was verified. It was also found from the results of this study that, compared with the Yubetsu River, frazil in the Shokotsu River was more likely to accumulate due to the low flow frequency. In other words, frazil was more likely to transition into ice because the friction velocity on the underside of the ice is small and the water temperature in Shokotsu was low.