GIS 기반 산악형 국립공원 지역의 산사태 영향인자 특성 분석 = GIS-based Analysis on Characteristics of the Influential Factors Causing Landslides in Mountainous National Parks

국문 초록 (Abstract)

본 연구에서는 산악형 국립공원 지역인 설악산, 지리산과 일반 산악지역인 경북 봉화 및 경남 거창지역을 대상으로 산사태 발생 영향인자 특성을 분석하였다. 분석방법은 항공영상에서 산사태 피해지를 추출하고 GIS 기법으로 산사태 발생에 영향을 미치는 인자를 공간 DB화하였다. 11개 인자를 공간분석기법을 통해 분석하고 우도비를 이용하여 대상지별 산사태 발생특성을 분석하였다. 산악형 국립공원은 일반산지 지역보다 평균집수면적이 2배 이상 크고, 사면곡률은 복합적이고 오목한 형태, 영급은 7영급, 경급은 중대경목이 주로 분포하였다. 산악형 국립공원과 일반 산악지역의 산사태 발생영향도 비교를 위해 우도비를 분석한 결과 집수면적이 2,000~10,000 m2 구간에서 일반 산악지역보다 높게 나타났다. 또한 사면곡률은 오목한 구간이 높게 나타나 일반 산악지역에서 볼록한 구간이 높게 나타난 것과 대조를 이루었다. 영급은 4, 7영급, 경급은 대경목에서 우도비가 가장 높았으나 일반 산악지역은 2, 3영급, 소중경목에서 우도비가 비교적 높게 나타나 일반 산악지역과 다른 경향을 나타냈다.

다국어 초록 (Multilingual Abstract)

This study was carried out to analyze characteristics of the influential factors causing landslides in mountainous National Parks (Mt. Seorak and Mt. Jiri) and Non-National park areas (Bonghwa and Geochang). Analytical methods were extracting landslide-damaged spots from aerial images and making spatial DB of influential factors causing landslides with using GIS. Eleven factors were analyzed through spatial analysis technique and characteristics of landslide occurrence in target areas were analyzed by using likelihood ratio. Average drainage area in mountainous National Parks was two times greater than that of Non-National park areas. Also, in mountainous National Parks, slope and curvature was complex and concave. Major age class was seventh and the diameter was third or fourth. As a result of analyzing likelihood ratio to compare landslide occurrence rate in mountainous National Parks and Non-National park areas, areas with an drainage area between 2,000 to 10,000 m2 have greater drainage area than general mountainous areas. Also, in mountainous National Parks, slope and curvature showed more concave areas, was compared start contrast to general mountainous areas showing more convex areas. Age class of fourth and seventh, and DBH of four have the highest likelihood ratio in mountainous National Parks, which was different from general mountainous areas where age class of two and three, and diameter of two and three had the highest likelihood ratio.

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