Estimation of Spatial Soil Distribution Changed by Debris Flow using Airborne Lidar Data and the Topography Restoration Method
2012
Woo, C.S., Korea Forest Research Institute, Seoul, Republic of Korea | Youn, H.J., Korea Forest Research Institute, Seoul, Republic of Korea | Lee, C.W., Korea Forest Research Institute, Seoul, Republic of Korea | Lee, K.S., Inha University, Incheon, Republic of Korea
The flowed soil volume is able to be estimated simply from topographic data of before and after the debris flow. However, it is often difficult to obtain high resolution topographic data before debris flow because debris flow was occurred in mountainous area and airborne Lidar data was mainly surveyed in urban area. For this reason, Woo(2011) developed the topographic restoration method that can reconstruct the topography before the debris flow using airborne Lidar data. In this study, we applied the topographic restoration method on Inje county, Bongwha county and Jecheon city, produced topography data before debris flow that RMSE is from 0.16 to 0.34 m. Also, a soil variation was analyzed by topography data before and after debris flow, and it was used to estimate a real soil volume flowed to downstream and a spatial distribution showing collapses, flows, sedimentations appeared to debris flow.
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