한라산 아고산대에서의 사면 물질 이동 = Slow Mass Movement on a Subalpine Slope of Mount Halla, Jeju Island

국문 초록 (Abstract)

한라산 표고 1,710m에 발달한 나지 표층에 2개의 페인트 라인을 설치하여 자갈의 이동량을 관측하고, 이동 프로세스와 관련된 요인을 검토하였다. 관측 기간에 발생한 자갈의 이동량은 평균 58.2㎝로서 일평균 이동 거리는 0.24㎝이다. 계절별로 비교하면 동결기 0.3㎝에 대하여 비동결기는 0.05㎝에 불과하여 표층 자갈은 주로 동결기에 주빙하 프로세스를 통하여 이동하고 있다. 특히 서릿발 포행을 비롯한 동상 포행이 자갈의 이동을 주도하고 있다. 사면 경사각의 영향은 관측 기간 내내 측선Ⅱ의 이동량이 측선Ⅰ보다 큰 결과에 반영되어 있지만, 암괴와 식생이 자갈의 이동을 방해하므로 절대적이지는 않다. 자갈의 크기와 비중도 이동량에 관여하는 요인으로서 특히 스코리아의 작은 비중이 매우 큰 이동량을 가져왔다.

다국어 초록 (Multilingual 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 ㎝, equivalent to 0.24 ㎝/day. However, the rates of movement vary with seasons. Compared with 0.05 ㎝/day of a non-frozen season, a frozen season shows 0.3 ㎝/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.

목차 (Table of Contents)

• 요약
• Abstract
• 1. 서론
• 2. 조사 지역 및 방법
• 3. 결과
• 4. 고찰
• 5. 결론
• 참고문헌

참고문헌 (Reference)

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