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オソベツ川における吹雪による晶氷増加とアイスジャム発生危険箇所の抽出に関する研究 STUDY ON SNOWSTORM-INDUCED INCREASES IN FRAZIL SLUSH AND THE IDENTIFICATION OF POTENTIAL ICE JAM LOCATIONS ON THE OSOBETSU RIVER 鳥谷部, 寿人 吉川, 泰弘 阿部, 孝章 阿部 孝章 黒田, 保孝 船木, 淳悟 佐藤, 好茂 佐藤 好茂 津村, 喜武 open access c 2016 公益社団法人　土木学会 Ice jam Frazil slush Calculation model Ice-sheet's Froude number In December 2014, an ice jam occurred on the 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 an ice sheet’s Froude number 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 Froude numbers 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 Froude number of the ice sheet to identify potential ice jam locations on the Osobetsu River. 公益社団法人　土木学会 2016 jpn journal article VoR https://kitami-it.repo.nii.ac.jp/records/8457 土木学会論文集B1（水工学) 72 4 I_601 I_606 https://kitami-it.repo.nii.ac.jp/record/8457/files/2016-03.pdf application/pdf 2.9 MB 2017-01-12