III분과 : 사방댐 준설이 계류의 지형변화에 미치는 영향-지상 LiDAR 자료를 이용하여- = Division III : Topographical Changes in Torrential Stream After Dredging in Erosion Control Dam -Using Terrestrial LiDAR Data-

다국어 초록 (Multilingual Abstract)

This research was carried out to understand the impact of mountainous torrent on topographicalchange of slope and sediment volume within a deposit line by dredging of soil erosion control dam. TerrestrialLiDAR surveys were conducted at dredged and non-dredged sites. Terrestrial LiDAR has an advantage ondetecting topographical changes easily without demanding workmanship and technical skill for users. Thedistribution of erodible slope (20o-40°) was higher in non-dredged site than that of dredged site. However, thedistribution was higher in dredged site than that of non-dredged site after rainy season. Erosion and depositionappeared regularly in a dredged site, but those occurred irregularly in the non-dredged site. The inflow of soilper square meter was 1.7 times higher in dredged site than that of non-dredged site after rainy season. Thedifference of rainfall in each site did not affect to soil erosion. The distribution of erodible slope was increasedin dredged site than that of non-dredged site after rainy season due to inflow of soil from upper stream causedby dredging.

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