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Slow Mass Movement on a Subalpine Slope of Mount Halla, Jeju Island  

Kim, Tae-Ho (Department of Geography Education, Jeju National University)
Publication Information
Journal of the Korean Geographical Society / v.45, no.3, 2010 , pp. 375-389 More about this Journal
Abstract
In order to investigate the rates and factors of slow mass movement on a subalpine slope of Mount Halla, two painted stone lines were monitored in a bare patch at 1,710 m a.s.l. The mean movement of surface gravels is 58.2 cm, equivalent to 0.24 cm/day. However, the rates of movement vary with seasons. Compared with 0.05 cm/day of a non-frozen season, a frozen season shows 0.3 cm/day. It implies that the movement of surface gravels could be largely controlled by periglacial processes during a frozen season. In particular, frost creep including needle ice creep plays a main role in the movement of gravels under the thermal and soil conditions which are favorable for needle ice development. Since line II is located at a steeper slope than line I, the movement of line II was always larger than that of line I. However, slope gradient is not the most dominant factor contributing the movement of gravels, which can be interrupted by downslope big gravels and vegetation patches. The size and specific weight of gravels also can influence the movement of gravels. Porous and light scoriae result in relatively quick movement of gravels on the subalpine slope of Mount Halla.
Keywords
slow mass movement; frost creep; needle ice; subalpine zone; Mount Halla;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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