*Ayano Urushitani¹, Hideharu Ogasawara¹, Yutaka Iwasaki², Nahomi Arai², Mizuki Umehara², Tomohiro Fuchie³ (1. NexcoEast Engineering Company Limited, 2. Chiba Univercity , 3. East Nippon Expressway Company Limited)

*Kazuya Yokota¹, Sayoko Kouduki¹, Takatoshi Mikami², Yuto Sasaya², Syunsuke Satomura² (1. PACIFIC CONSULTANTS CO., LTD., 2. Hokkaido Regional Development Bureau, Hakodate Development and Construction Department, Imakane office of river)

*Watanabe keita¹, Makoto Yaneshita¹ (1. TAISEI CORPORATION)

*Akihito Aizawa¹, Manabu Terai¹ (1. Obayashi co.)

*Makoto Suzuki¹ (1. Central Nippon Expressway Company Limited)

*Tsuyoshi Yamaguchi¹, Haruo Takayama¹, Satoru Itagawa¹, Hideo Takeuchi¹ (1. Kajima Corporation)

*Yasuyuki Nomura¹, daiki kawamura¹, yukito isigaki², moe tuchida² (1. Kumagai Gumi Co.,Ltd., 2. NITTOC CONSTRUCTION CO.,LTD.)

*Tomoko Jinno¹, Takatoshi Tajima¹, Yoji Ishikawa¹, Yoshihiro Kawakami¹, Ryoya Nishida², Kohei Nishida² (1. OBAYASHI CORPORATION, 2. TOWING)