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GIS를 이용한 땅밀림지 특성 분석: 산지경사 및 산사태위험등급을 중심으로

Analysis of GIS for Characteristics on the Slow-Moving Landslide: With a Special Reference on Slope and Grade of Landslide

  • 박재현 (경남과학기술대학교 산림자원학과) ;
  • 서정일 (공주대학교 산림자원학과) ;
  • 이창우 (국립산림과학원 산림방재과)
  • Park, Jae-Hyeon (Department of Forest Resources, Gyeongnam National University of Science and Technology) ;
  • Seo, Jung Il (Depertment of Forest Resources, Kongju National University) ;
  • Lee, Changwoo (Division of Forest Disaster Management, National Institute of Forest Science)
  • 투고 : 2018.11.19
  • 심사 : 2019.01.28
  • 발행 : 2019.09.30

초록

이 연구는 땅밀림위험등급을 구축하기 위하여 수행되었다. 땅밀림지의 평균산지경사는 $23.8^{\circ}$($11.8^{\circ}{\sim}37.0^{\circ}$), 땅밀림지 내에서 미세지형지의 평균사면경사는 $23.5^{\circ}$ ($10.7^{\circ}{\sim}41.5^{\circ}$)로 미소한 차이가 있는 것으로 분석되었다. 땅밀림지 및 땅밀림 재발생지에서 땅밀림지 내 등고선 간격과 땅밀림지 내 미세지형지의 등고선 간격은 5% 수준에서 유의한 결과를 나타내었다. 산사태위험등급에 포함되지 않는 땅밀림지는 전체 땅밀림지 중 1등급이 14개소(약 38.0%), 2등급이 6개소(약 16.0%), 3등급과 4등급이 각각 5개소(약 14.0%), 5등급이 16개소(약 43.0%), 산사태위험지등급 외 지역이 9개소(약 24.0%)이었다. 땅밀림지 중 산사태위험 1~5등급으로 지정되지 않은 면적 비율이 50.0% 이상인 지역은 8개소(약 22.0%), 20.0%~50.0% 이상인 지역은 18개소(약 49.0%), 20.0% 이상인 지역은 26개소(약 70.0%)이었다.

This study was carried out to establish basic data for the development of slow-moving landslide hazard classes. Mountain slopes in slow-moving landslide areas ranged from $11.8^{\circ}$ to $37.0^{\circ}$ with a mean slope of $23.8^{\circ}$. However, the slope inclination of microtopography in slow-moving landslide areas was slightly different, with a mean slope of $23.5^{\circ}$ ($10.7^{\circ}{\sim}41.5^{\circ}$) compared with the mountain slope. There was a significant difference (p < 0.05) between the contour intervals of microtopography and the contour intervals of the slow-moving landslide areas. Among all the slow-moving landslide areas examined, 14 plots (approximately 38.0%) were classified into landslide hazard class I, 6 plots (approximately 16.0%) into landslide hazard class II, 5 plots (approximately 14.0%) into landslide hazard class III and IV, and 16 plots (approximately 43.0%) into landslide hazard class V, whereas 9 plots (approximately 24.0%) fit the no landslide hazard class.

키워드

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