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http://dx.doi.org/10.17820/eri.2020.7.4.327

ROC Analysis of Topographic Factors in Flood Vulnerable Area considering Surface Runoff Characteristics  

Lee, Jae Yeong (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Kim, Ji-Sung (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Ecology and Resilient Infrastructure / v.7, no.4, 2020 , pp. 327-335 More about this Journal
Abstract
The method of selecting an existing flood hazard area via a numerical model requires considerable time and effort. In this regard, this study proposes a method for selecting flood vulnerable areas through topographic analysis based on a surface runoff mechanism to reduce the time and effort required. Flood vulnerable areas based on runoff mechanisms refer to those areas that are advantageous in terms of the flow accumulation characteristics of rainfall-runoff water at the surface, and they generally include lowlands, mild slopes, and rivers. For the analysis, a digital topographic map of the target area (Seoul) was employed. In addition, in the topographic analysis, eight topographic factors were considered, namely, the elevation, slope, profile and plan curvature, topographic wetness index (TWI), stream power index, and the distances from rivers and manholes. Moreover, receiver operating characteristic analysis was conducted between the topographic factors and actual inundation trace data. The results revealed that four topographic factors, namely, elevation, slope, TWI, and distance from manholes, explained the flooded area well. Thus, when a flood vulnerable area is selected, the prioritization method for various factors as proposed in this study can simplify the topographical analytical factors that contribute to flooding.
Keywords
Flood vulnerable area; ROC analysis; Runoff mechanism; Topographic analysis;
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Times Cited By KSCI : 16  (Citation Analysis)
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