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Evaluation of Steep Slopes Adjacent to Multi-use Facilities in National Parks using GIS

GIS를 활용한 국립공원 다중이용시설 인접 급경사지 평가

  • Lee, Dong Hyeok (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Jun, Kye Won (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Jung, Min Jin (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Park, Jun Hyo (Korea National Park Research Institute, Korea National Park Service)
  • 이동혁 (강원대학교 방재전문대학원) ;
  • 전계원 (강원대학교 방재전문대학원) ;
  • 정민진 (강원대학교 방재전문대학원) ;
  • 박준효 (국립공원연구원)
  • Received : 2021.11.25
  • Accepted : 2021.12.10
  • Published : 2021.12.31

Abstract

Recently, due to climate change, the slope is increasing, and the risk of steep slope disasters such as the occurrence of slope collapse in the east coast and Busan region in 2019 and the Gokseong landslide in 2020 is increasing. Particularly, most national parks are made up of mountainous areas, and the risk of disasters on steep slopes is increasing. As the ground of the national park is aging and the weathering and jointing of the bedrock are accelerating due to climate change, the slope collapse and rockfall are increasing, and the annual number of visitors is increasing, it is necessary to manage steep slopes adjacent to multi-use facilities with many users. In this study, dangerous steep slopes that affect multi-use facilities in national parks were analyzed using GIS and verified through field surveys. As a process for extracting steep slopes adjacent to multi-use facilities in national parks, the slope was made in DEM and slopes of 34 degrees or higher were extracted. The difference between the maximum and minimum heights of the extracted slopes was used to confirm that the slopes met the standard for steep slopes, and the analysis of the slope direction was used to confirm whether it had an effect on the multi-use facilities. After that, precision aerial images and field photos were analyzed to finally identify risks at 4 sites, and field surveys were conducted. As a result of the field survey, all 4 sites were found to be steep slopes, 3 were graded D and 1 was graded C, so it was confirmed that management was required as a risk of collapse. All steep slopes extracted through GIS were found to be dangerous, so it is judged that the extraction of steep slopes through GIS would be appropriate.

최근 기후변화로 인해 비탈면이 증가하고 있으며 2019년 동해안 및 부산지역 사면붕괴 발생 및 2020 곡성 산사태 등 급경사지 재해에 대한 위험성이 증가하고 있는 추세이다. 특히 국립공원은 대부분 산지로 이루어졌으며 급경사지 재해에 대한 위험성이 증가하고 있다. 국립공원의 지반은 노령화 되고 기후변화로 인해 암반의 풍화 및 절리가 가속화되고 있어 사면붕괴 및 낙석이 증가하고 연간 탐방 객수는 증가하는 추세로 이용자수가 많은 다중이용시설에 인접한 급경사지 관리가 필요한 실정이다. 본 연구에서는 GIS를 활용해 국립공원 다중이용시설에 영향을 미치는 위험 급경사지를 분석하고 현장조사를 통해 검증하였다. 국립공원 다중이용시설 인접 급경사지를 추출하기 위한 과정으로 DEM에서 경사도를 제작하고 34도 이상인 사면을 추출하였다. 추출된 사면의 최대높이와 최소높이 차이로 급경사지 기준에 부합하는 사면을 확인하였으며 사면방향 분석을 통해 다중이용시설에 영향을 미치는지 확인하였다. 이후 정밀 항공영상과 현장사진을 분석하여 최종적으로 4개소의 위험지점을 확인하였으며 현장조사를 실시하였다. 현장조사 결과 4개소 모두 급경사지로 나타났으며 3개소는 D등급, 1개소는 C등급으로 나타나 붕괴위험지역으로 관리가 필요할 것으로 확인되었다. GIS를 통해 추출한 급경사지 모두 위험한 것으로 나타나 GIS를 통한 급경사지 추출이 타당할 것으로 판단된다.

Keywords

Acknowledgement

This document was financially supported by Ministry of the Interior and Safety as Human Resource Development Project in Disaster Management(C2001777-01-01). This document was financially supported by Korea National Park Service.

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