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http://dx.doi.org/10.21729/ksds.2021.14.4.37

Conveyance Verification through Analysis of River Vegetation and Soil Impact using Sentinel-2  

Bang, Young Jun (Dept. of Civil & Environmental Engineering, Hongik Univ.)
Choi, Byeong Jun (Dept. of Civil & Environmental Engineering, Hongik Univ.)
Lee, Seung Oh (Dept. of Civil & Environmental Engineering, Hongik Univ.)
Publication Information
Journal of Korean Society of Disaster and Security / v.14, no.4, 2021 , pp. 37-45 More about this Journal
Abstract
Flooding damage may occur due to an unexpected increase in rainfall in summer. Previously, the roughness coefficient, which is a major factor of conveyance, was calculated through on-site measurement, but in case of on-site measurement, there are many limits in accurately grasping changes in vegetation. In this study, the vegetation index (NDVI) was calculated using the Sentinel-2 optical images, and the modified roughness coefficient was calculated through the density and distribution area of the vegetation. Then the calculated roughness coefficient was applied to HEC-RAS 1D model and verified by comparing the results with the water level at the water level station directly downstream of the Soyang River dam. As a result, the error rate of the water level decreased about 14% compared to applying the previous roughness coefficient. Through this, it is expected that it will be possible to refine the flood level of rivers in consideration of seasonal flood characteristics and to efficiently maintain rivers in specific sections.
Keywords
Manning roughness; HEC-RAS 1D; NDVI; SENTINEL-2;
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Times Cited By KSCI : 2  (Citation Analysis)
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