1. Tohkamachi Experimental Station, Department of Disaster Prevention, Forestry and Forest Products Research Institue
2. Shinjo Cryospheric Environment Laboratory, Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Resilience
3. Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Resilience
4. Department of Civil and Environmental Engineerging, Nagaoka University of Technology