5:15 PM - 6:30 PM
[MIS23-P02] Differences of periglacial smooth slope in the Hakuba Range, the northern Japanese Alps
Keywords:periglazialer glatthang, Terrain formation process, Mt.Hakuba-dake, Mt.Syakushi-dake, UAV
1. Introduction
In the northern Japanese Alps, asymmetrical ridge with gentle slopes on the western side and steep slopes on the eastern side can be seen in discontinuity. The gentle slope of the asymmetrical ridge is called a periglacial smooth slope because of its origin(Klaer, 1962). In the case of sand and gravel on periglacial smooth slopes, studies have been conducted on slope morphology, sediments, amount of surface debris transported, and periglacial action causing the transport. These studies have shown that slope, gravel size, subterranean matrix, and vegetation play a role in slope formation. (e. g, Alpine Landform Research Group, 1978;Some et al.). However, there are no sufficient reports on the areal extent and differences in the formation process of periglacial smooth slopes, such as topographic change and gravel movement. In this study, we examined the formation process on periglacial smooth slopes and differences in slopes by comparing the periglacial smooth slopes around Hakuba mountain range. We also discussed the interannual variability of freeze-thaw action its effects ground temperature data observed from 2014 to 2017.
In the northern Japanese Alps, asymmetrical ridge with gentle slopes on the western side and steep slopes on the eastern side can be seen in discontinuity. The gentle slope of the asymmetrical ridge is called a periglacial smooth slope because of its origin(Klaer, 1962). In the case of sand and gravel on periglacial smooth slopes, studies have been conducted on slope morphology, sediments, amount of surface debris transported, and periglacial action causing the transport. These studies have shown that slope, gravel size, subterranean matrix, and vegetation play a role in slope formation. (e. g, Alpine Landform Research Group, 1978;Some et al.). However, there are no sufficient reports on the areal extent and differences in the formation process of periglacial smooth slopes, such as topographic change and gravel movement. In this study, we examined the formation process on periglacial smooth slopes and differences in slopes by comparing the periglacial smooth slopes around Hakuba mountain range. We also discussed the interannual variability of freeze-thaw action its effects ground temperature data observed from 2014 to 2017.