@article{oai:kitami-it.repo.nii.ac.jp:02000029, author = {深澤, アダム翔 and FUKAZAWA, Adam Sho and 渡邊, 康玄 and Watanabe, Yasuhau and 島田, 友典}, journal = {河川技術論文集}, month = {Jun}, note = {In recent years, bank breaching occurred high frequency. In August 2016, the east pan of Hokkaido in Japan was attacked a heavy rainfall and the tributaries of Tokoro River (Shibayarnasawa River and Toua River) had a bank breach caused by the back water of Tokoro River. Although both tributaries were almost the same size and both junctions were very close, the situation of inundation were largely different. At the breaching point of the Sibayarnasawa River, the inundated flow toward to the upstream side of the inland, while at the Toua River it was perpendicular to the channel. In order to understand the cause of the difference in phenomena, it was tried to reproduce the breaching situation in both tributaries using the numerical simulation model “iRIC Nays 2D Breach”. From the result, it was revealed that the direction of the inundated flow changes greatly depending on the timing of the discharge change at the tributaly when the bank failure occurs. At the time of bank breaching, when the discharge of the tributary is small, the inundated flow towards to the upstream direction. At the time of bank breaching, when the discharge of the tributary is large, the inundated flow towards to the perpendicular direction of the channel.}, pages = {541--546}, title = {2016年8月豪雨における常呂川支川の破堤機構の解明}, volume = {25}, year = {2019}, yomi = {ワタナベ, ヤスハル and シマダ, トモノリ} }