GIS-based Analysis on Characteristics of the Influential Factors Causing Landslides in Mountainous National Parks

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 NonNational park areas, areas with an drainage area between 2,000 to 10,000 m 2 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