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Analysis of Topographical Factors in Woomyun Mountain Debris Flow Using GIS

GIS를 이용한 우면산 토석류 지형인자 분석

  • Lee, Hanna (Spatial Information Cooperative Program, Gangneung-Wonju National University) ;
  • Kim, Gihong (Dept. of Civil Engineering, Gangneung-Wonju National University)
  • 이한나 (강릉원주대학교 공간정보협동과정) ;
  • 김기홍 (강릉원주대학교 토목공학과)
  • Received : 2020.08.14
  • Accepted : 2020.09.04
  • Published : 2020.10.31

Abstract

A number of investigations and studies have been conducted in various fields regarding the sediment disasters of Mt. Woomyeon that occurred in July 2011. We collected and compared the topographic information of the general points where debris flows did not occur and the collapse points where the debris flow occurred in order to find out the characteristics of the collapse points in Woomyeon mountain. The collected topographic information is altitude, curvature, slope, aspect and TPI(topographic position index). As a result of comparison, there were relatively many collapse points at an altitude of 210m to 250m, and at a slope of 30° to 40°. In addition, the risk of collapse was low in a cell where the curvature was close to 0, and the risk was higher in concave terrain than in convex terrain. In the case of TPI, there was no statistical difference between the general points and the collapse points when the analysis radius was larger than 200m, and there was a correlation with the curvature when the analysis radius was smaller than 50m. In the case of debris flows that are affected by artificial structures or facilities, there is a possibility of disturbing the topographic analysis results. Therefore, if a research on debris flow is conducted on a mountain area that is heavily exposed to human activities, such as Woomyeon mountain, diversified factors must be considered to account for this impact.

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