[H-DS10] Geohazards in humid, tectonically active countries and their precursors

[HDS10-06] Monitoring rock temperature at different depths in the northern Japanese Alps

*Hirotaka Sugiyama¹, Chiyuki Narama¹ (1.Niigata University)

Keywords:rock temperature, seasonal freeze-thaw, snowy cold region

Rockfall is one of the important processes that affect the stability and change of rock slopes in Alpine zones (Vehling et al., 2016; Ravanel et al., 2017) and is an essential issue for the investigation of rockfall because of the safety management of the human activity. Furthermore, frost weathering is a major control of rockwall erosion in Alpine environments. Therefore, knowledge thermal state and evolution of rock slopes is vital for estimating such a process, especially concerning climate change.
We installed temperature sensors in several rocks (2cm, 20cm, 40cm) with different environments, such as snow cover and solar radiation. Temperature observations were conducted from September 2021 to October 2022. The freezing index and mean annual temperature differed depending on the ground surface's depth and snow conditions.