The Journal of Engineering Geology (지질공학)

The Korean Society of Engineering Geology (대한지질공학회)
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Development of a GIS-based Computer Program to Design Countermeasures against Debris Flows

GIS기반 토석류 산사태 대응공법 설계 프로그램 개발

  • Song, Young-Suk (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Chae, Byung-Gon (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
  • 송영석 (한국지질자원연구원 지구환경연구본부) ;
  • 채병곤 (한국지질자원연구원 지구환경연구본부)
  • Received : 2013.02.22
  • Accepted : 2013.03.18
  • Published : 2013.03.31
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Abstract

We developed a computer program (CDFlow v. 1.0) to design countermeasures against debris flows in natural terrain. The program can predict the probability of landslides occurring in natural terrain and can estimate the zone of damage caused by a debris flow. It can also be used to design the location and size of countermeasures against the debris flow. The program is run using the ArcGIS Engine, which is one of the most well-known Geographic Information System (GIS) tools for developers. The quasi-dynamic wetness index and the infinite slope stability equation were applied to predict landslide probability as a type of slope safety factor. The calculated safety factor was compared with the required safety factor, and areas of high probable potential for landslides were then selected and represented on the digital map. The volume of debris flow was estimated using these areas of high probable potential for landslides and soil depth. The accumulated volume of debris flow can be calculated along the flow channel. To assess the accuracy of the program, it was applied to a real landslide site at Deoksan-ri, Inje-gun, Kangwon-Province, where four debris barriers have been installed in the watershed of the site. The results of soil tests and a field survey indicate that the program has great potential for estimating probable landslide areas and the trajectory of debris flows. Calculation of the capacity volume of existing debris barriers revealed that they had insufficient capacity to store the calculated amount of debris flow. Therefore, this program enables a rational estimation of the optimal location and size of debris barriers.

본 연구에서는 자연사면에서 토석류 산사태 대응공법의 설계 프로그램(CDFlow ver 1.0)을 개발하였다. 이 프로그램은 자연사면에서 발생되는 산사태의 발생 가능성을 평가할 수 있으며, 토석류 산사태로 인하여 발생되는 피해범위를 산정할 수 있다. 또한 이 프로그램은 토석류 산사태의 대응공법 위치와 규모를 설계할 수 있다. 이 프로그램은 가장 잘 알려진 지리정보시스템(GIS) 개발도구중의 하나인 ArcGIS 엔진에서 구동되도록 개발되었다. 그리고 유사동역학적인 습윤지수와 무한사면의 안정해석기법을 적용하여 산사태 발생가능성을 예측하였다. 계산된 사면안전율은 기준안전율과 비교하여 산사태 잠재발생 구간을 선정하고 이를 도면상에 표시하였다. 토석류량은 산사태 잠재발생 구간과 토층심도에 의해 산정된다. 그리고 누적 토석류량은 이동경로를 따라서 계산할 수 있다. 개발된 프로그램의 적용성을 평가하기 위하여 실제 산사태 발생현장을 대상으로 적용하였다. 산사태 발생현장은 강원도 인제군 덕산리에 위치하고 있으며, 대상수계에 4개의 사방댐이 설치되어 있다. 토질실험 및 현장조사결과를 토대로 산사태 발생가능성이 높은 구간과 토석류의 이동경로를 산정하였다. 해석결과 기존에 설치된 사방댐의 규모는 계산된 토석류량을 저장하기에 부족한 것으로 나타났다. 따라서 본 프로그램을 이용하여 토석류 산사태 대응공법의 설치위치와 규모를 합리적으로 산정할 수 있을 것이다.

Keywords

References

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