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2020 Vol.7, Issue 4 Preview Page

Original Article

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

지표 유출 특성을 고려한 홍수취약지역 지형학적 인자의 ROC 분석

Jae Yeong Lee1
,
Ji-Sung Kim2*
이 재영1
,
김 지성2*
1Postdoctoral Researcher, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
2Senior Researcher, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
1한국건설기술연구원 국토보전연구본부 박사후연구원
2한국건설기술연구원 국토보전연구본부 수석연구원
*Corresponding Author
31 December 2020. pp. 327-335
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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

본 연구에서는 홍수해석 등 수치모형을 이용한 기존의 홍수위험지역 선정 시 필요한 시간과 노력을 절감하고자 유출메커니즘 기반의 지형 분석을 통해 홍수취약지역을 제시하고자 한다. 유출메커니즘 기반의 홍수취약지역은 강우-유출수의 지표면 흐름 누적 특성에 유리한 지역으로 일반적으로 저지대, 완경사, 하천 등이 해당된다. 분석을 위해 대상지역인 서울시의 수치지형도를 이용하여 표고, 경사도, 수직 및 수평 사면 곡률, 지표습윤계수 (Topographic Wetness Index, TWI), 유수력 지수 (Stream Power Index, SPI), 하천 및 맨홀과의 거리 등 8개의 지형학적 인자를 고려하였다. 지형학적 인자들과 실제 침수흔적자료와의 ROC (Receiver Operation Characteristic) 분석 결과, 표고, 경사도, 지표습윤계수, 맨홀과의 거리 등 4개의 지형학적 인자가 침수지역을 잘 설명하는 것으로 나타났다. 홍수취약지역 선정 시 본 연구에서 제안하는 다양한 인자에 대한 우선순위 산정 방안은 홍수에 기여하는 지형학적 분석 요소를 간소화 시킬 수 있을 것으로 판단된다.

키워드
홍수취약지역
ROC 분석
유출메커니즘
지형 분석
국문키워드5
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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 7
  • No :4
  • Pages :327-335
  • Received Date : 2020-11-24
  • Revised Date : 2020-12-04
  • Accepted Date : 2020-12-04
  • DOI :https://doi.org/10.17820/eri.2020.7.4.327
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