The influence of fine sediment on the fluidity of debris flows based on the equilibrium concentration and friction coefficient

Yuichi Sakai1, Norifumi Hotta2, Yuji Hasegawa3, Kana Nakatani4, Takuro Suzuki5, Hironao Shima6, Akio Kuroda6 and Taro Uchida2, (1)University of Tokyo, Bunkyo-ku, Japan, (2)University of Tsukuba, Tsukuba, Japan, (3)Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, (4)Kyoto University, Sakyo-ku, Japan, (5)Forestry and Forest Products Research Institute, Tsukuba, Japan, (6)Sabo & Landslide Technical Center, Chiyoda-ku, Japan