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Study on the Identification of Potential Ice Jam Locations on Osobetsu River That Takes into Account Snowstorms and the Densimetric Froude Number of River Ice

Author(s): Toshihito Toyabe; Yasuhiro Yoshikawa; Takaaki Abe; Yasutaka Kuroda; Jungo Funaki; Yoshitake Tsumura; Naoto Inagaki

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Abstract: In December 2014, an ice jam occurred on Osobetsu River after a snowstorm. This study investigated factors that contribute to increases in frazil slush and identified locations prone to ice jams. Previous studies using a hydraulic model experiment showed that the densimetric Froude number of ice sheets become small where ice sheets are static or accumulated. Moreover, a frazil slush calculation model that is based on the theory of heat balance in stream water accurately reproduced the measured thickness of frazil slush. However, no previous studies on ice jams have taken into account the densimetric Froude number of ice sheets. Also, certain weather phenomena, such as snowstorms and avalanches, are not factored into the current model for calculating frazil slush thickness. Therefore, the authors developed the model such as to take into account the effect of snowstorms. Furthermore, we used the densimetric Froude number of ice sheets to identify potential ice jam locations on Osobetsu River.

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Year: 2016

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