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Analysis of Influence Factors of Forest Soil Sediment Disaster Using Aerial Photographs - Case Study of Pyeongchang-county in Gangwon-province -  

Woo, Choong-Shik (Division of forest soil conservation, Korea Forest Research Institute)
Youn, Ho-Joong (Division of forest soil conservation, Korea Forest Research Institute)
Lee, Chang-Woo (Division of forest soil conservation, Korea Forest Research Institute)
Jeong, Yongho (Division of forest soil conservation, Korea Forest Research Institute)
Publication Information
Journal of the Korean Society of Environmental Restoration Technology / v.11, no.1, 2008 , pp. 14-22 More about this Journal
Abstract
The forest soil sediment disasters occurred in Jinbu-myeon Pyeongchang county were investigated characteristics by the aerial photograph analysis. After digitizing from aerial photographs, forest soil sediment disaster sites were classified into 695 collapsed sites, 305 flowed sites and 199 sediment sites. DEM (Digital Elevation Model) were generated from 1 : 5,000 digital topographic map. Factors of geography, hydrology, biology, and geology were analyzed using DEM, geologic map, and forest stand map with aerial photographs by GIS spatial analysis technique. The forest soil sediment disasters were mainly occurred from southeastern slope to southwestern slope. In collapsed sit es, the average slope degree is $28.9^{\circ}$, the average flow length is 163.5m, the average area of drainage basin is 897$m^2$. In case of flowed sites, the average slope degree, flow length, the area of drainage basin and confluence order is $27.0^{\circ}$, 175m, 2,500$m^2$ and 1, respectively. In sediment sites, the average slope, flow length, the area of drainage basin and confluence order is $12.5^{\circ}$, 2,50m, 25,000$m^2$ and 4, respectively. Also the forest soil sediment disasters were occurred most of collapsed sites in the afforest land after felling and igneous rocks composed of granite.
Keywords
Forest soil sediment disaster; Aerial photographs; DEM; GIS;
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