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2014 Vol.30, Issue 12 Preview Page
Rock Slope Failure Analysis and Landslide Risk Map by Using GIS

GIS를 이용한 암반사면 파괴분석과 산사태 위험도

Hye-Jin Kwon1
,
Gyo-Won Kim2
권 혜진1
,
김 교원2
1Resources development Division, Korea Resources Corporation
2Dept. of Geology, Kyungpook National Univ.
1한국광물자원공사 자원개발본부
2경북대학교 지질학과
교신저자. Corresponding Author. 
31 December 2014. pp. 15-25
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Abstract

In this study, types of rock slope failure are analyzed by considering both joint characteristics investigated on previous landslide regions located at northern part of Mt. Jiri and geographic features of natural slopes deduced from GIS. The landslide prediction map was produced by superposing the frequency ratio layers for the six geographic features including elevation, slope aspect, slope angle, shaded relief, curvature and stream distance, and then the landslide risk map was deduced by combination of the prediction map and the damage map obtained by taking account of humanity factors such as roads and buildings in the study area. According to analysis on geographic features for previous landslide regions, the landslides occurred as following rate: 88% at 330∼710 m in elevation, 77.7% at 90∼270o in slope aspect, 93.9% at 10∼40o in slope angle, 82.78% at grade3∼7 in shaded relief, 86.28% at –5∼+5 in curvature, and 82.92% within 400m in stream distance. Approximately 75% of the landslide regions belongs to the region of ‘high’ or ‘very high’ grade in the prediction map, and 13.27% of the study area is exposed to ‘high risk’ of landslide.

Keywords
Landslide
GIS
Rock slope failure
Frequency ratio
Prediction map
Damage map
Risk map

본 연구에서는 지리산 북쪽의 과거 산사태 발생영역에서 조사된 절리특성과 GIS를 이용하여 추출한 지형특성을 근거하여 연구지역에서 예상되는 암반사면 파괴유형을 분석하였다. 또 해발고도, 사면방향, 사면경사, 음영도, 곡률, 하천 이격거리 등 6개의 지형특성 인자의 빈도비를 중첩하여 산사태 예측도를 작성하였으며, 산사태 예측도와 도로 및 주거지와 같은 지역의 인문적인 인자를 고려한 산사태 피해도를 조합하여 최종적으로 연구지역의 산사태 위험도를 작성하였다. 연구지역에서 발생한 산사태의 지형적 특성을 분석한 결과, 해발고도 330∼710m에서 88%, 사면방향 동남-남-남서 방향(90∼270o)에서 77.7%, 사면경사 10∼40o에서 93.39%, 음영도 등급3∼7에서 82.78%, 곡률특성 –5∼+5에서 86.28%, 하천 이격거리 400m 이내에서 82.92%가 발생하였다. 산사태가 발생한 영역의 75%는 산사태 위험도에서 위험 등급이 ‘높음’ 이상인 지역이어서 위험 예측에 대한 신뢰성이 확인되었으며, 연구지역의 13.27%는 산사태 위험에 노출된 것으로 분석되었다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 30
  • No :12
  • Pages :15-25
  • Received Date : 2014-09-29
  • Revised Date : 2014-12-03
  • Accepted Date : 2014-12-03
  • DOI :https://doi.org/10.7843/kgs.2014.30.12.15
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