Algorithms and Application of the Topographic Restoration Method for Damaged Areas by Debris Flows Using Airborne LIDAR Data in Republic of Korea

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  • Woo Choong Shik
    Division of Forest Disaster Management, Korea Forest Research Institute
  • Kim Kyongha
    Division of Forest Disaster Management, Korea Forest Research Institute
  • Youn Ho Joong
    Division of Forest Disaster Management, Korea Forest Research Institute
  • Chang Woo Lee
    Division of Forest Disaster Management, Korea Forest Research Institute
  • Kyu Sung Lee
    Department of Geoinformatic Engineering, Inha University

Description

The topographic restoration method (here in after TRM) that can estimate the topographic features of pre-disaster condition by debris flow was developed. The DEM from the airborne LIDAR data and the Gaussian mixture model were applied for estimating the cross-section and central position in damaged stream lines by debris flow. TRM was applied to Mt. Umyeon catastrophically damaged by debris flows in 2011 in order to confirm how accurate to restore topography. Root Mean Square Error(RMSE) between LIDAR data before debris flow and restored data by TRM after that in Mt. Umyeon showed 0.668 m. The three kinds of the soil distribution output such as a specific purpose such as soil volume distribution, section-specific distribution and sediment transport distribution were developed. These output may be useful to estimate a spatial distribution of debris including soil, boulders and rocks within the statistical confidences. As analyzing result of the soil distribution output, we concluded that the soils in the stream-bed and bank along the streams contribute to the sediments in a downstream much more than the amount of soils in a land sliding site.

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