Author(s): Tomomichi Hirata; Yasuhiro Yoshikawa; Takaaki Abe; Hiroya Ogushi
Linked Author(s): yasuhiro yoshikawa
Keywords: Ice jam; Field observation; Water level rise; Break-up period; Ice sheet thickness
Abstract: We conducted a field survey of ice jams that occurred in Hokkaido in March 2023, and attempted to obtain quantitative knowledge of the ice jam phenomenon. The scale of ice jam was evaluated based on the amount of water level rise (∆H) when ice jam occurred. By comparing the past occurrences with those in March 2023 using ∆H, it was found that the water level change ranged from 0.57 m to 4.22 m. There is a positive correlation (r=0.70) between cumulative rainfall before ice jams and ∆H. We tried to apply the method of estimating the time of ice break-up. It was confirmed that the ice thickness variation acceleration PB appears before the ice jam occurrence time, and that the time of ice break-up can be estimated.
Year: 2024