Japan Geoscience Union Meeting 2016

Presentation information


Symbol M (Multidisciplinary and Interdisciplinary) » M-GI General Geosciences, Information Geosciences & Simulations

[M-GI20] Environmental changes in mountainous area

Tue. May 24, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Keisuke Suzuki(Department of Environmental Sciences, Faculty of Science, Shinshu University), Yoshihiko Kariya(Department of Environmental Geography, Senshu University), Akihiko SASAKI(Faculty of Science, Shinshu University)

5:15 PM - 6:30 PM

[MGI20-P11] The distribution of rockfall and topographical change in Shirouma Daisekkei, the Northern Japanese Alps

*Hitomi Hata1, Chiyuki Narama2, Kotaro FUKUI3 (1.Graduate School of Science and Technology, Niigata University, 2.Department of Environmental Science, Niigata University, 3.Tateyama Caldera Sabo Museum)

Keywords:rockfall, Shirouma-Daisekkei, topographical change

Shirouma-Daisekkei is one of the three largest snow patches in the Japanese Alps. More than 10,000 climbers pass on the snow patch every year. The climbers have suffered accidents of rockfall and rock slip. In August 2005, rock slip at the rock wall of Shakushi-dake causes injured two people. In August 2008, rock slip at upper part of snow patch causes two climbers sacrificed (Kariya et al., 2008). In this study, we carried out field survey during 2014-2015, to clarify the state of rockfall and rock slip, and topographical change around Shirouma-daisekkei. Interval camera showed many rock fragments appeared from inside of snow emerged by declining snow surface in 2014. On the other hand, many rock fragments were produced from rock wall after June 2015. The total number of rock fragments (>30cm) is 570 on the snow patch at the end of September. The distribution of rock fragments is local, and reflected the differences in the local geological feature of this study area.