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2019 Vol.52, Issue 5 Preview Page

Research Article

Development and evaluation of a 2-dimensional land surface flood analysis model using uniform square grid

정형 사각 격자 기반의 2차원 지표면 침수해석 모형 개발 및 평가

Yun-Seok Choia*
,
Joo-Hun Kimb
,
Cheon-Kyu Choic
,
Kyung-Tak Kimd
최 윤석a*
,
김 주훈b
,
최 천규c
,
김 경탁d
aSenior Researcher, Department of Land, Water and Environment Research, Korea Institute of Construction Technology
bSenior Researcher, Department of Land, Water and Environment Research, Korea Institute of Construction Technology
cResearch Specialist, Department of Land, Water and Environment Research, Korea Institute of Construction Technology
dResearch Fellow, Department of Land, Water and Environment Research, Korea Institute of Construction Technology
a한국건설기술연구원 국토보전연구본부 수석연구원
b한국건설기술연구원 국토보전연구본부 수석연구원
c한국건설기술연구원 국토보전연구본부 전임연구원
d한국건설기술연구원 국토보전연구본부 연구위원
* Corresponding Author
31 May 2019. pp. 361-372
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Abstract

The purpose of this study is to develop a two-dimensional land surface flood analysis model based on uniform square grid using the governing equations except for the convective acceleration term in the momentum equation. Finite volume method and implicit method were applied to spatial and temporal discretization. In order to reduce the execution time of the model, parallel computation techniques using CPU were applied. To verify the developed model, the model was compared with the analytical solution and the behavior of the model was evaluated through numerical experiments in the virtual domain. In addition, inundation analyzes were performed at different spatial resolutions for the domestic Janghowon area and the Sebou river area in Morocco, and the results were compared with the analysis results using the CAESER-LISFLOOD (CLF) model. In model verification, simulation results were well matched with the analytical solution, and the flow analyses in the virtual domain were also evaluated to be reasonable. The results of inundation simulations in the Janghowon and the Sebou river area by this study and CLF model were similar with each other and for Janghowon area, the simulation result was also similar to the flooding area of flood hazard map. The different parts in the simulation results of this study and the CLF model were compared and evaluated for each case. The results of this study suggest that the model proposed in this study can simulate the flooding well in the floodplain. However, in case of flood analysis using the model presented in this study, the characteristics and limitations of the model by domain composition method, governing equation and numerical method should be fully considered.

Keywords
Flood analysis model
2-Dimensional
Uniform square grid
Finite volume method
Parallel computing

본 연구의 목적은 운동량방정식에서 이송가속도항을 제외한 지배방정식을 이용하여 정형 사각 격자 기반의 2차원 지표면 침수해석 모형을 개발하는 것이다. 공간적 이산화는 유한체적법을 이용하였으며, 시간적 이산화는 음해법을 적용하였다. 모형의 실행시간을 단축하기 위해서 CPU를 이용한 병렬계산 기법을 적용하였다. 개발된 모형의 검증을 위해서 해석해와 비교하고, 가상 도메인에서 수치실험을 통해 모형의 거동을 평가하였다. 또한 국내의 장호원 지역과 모로코의 Sebou 강 지역에 대해서 각기 다른 공간해상도로 침수해석을 수행하고, 그 결과를 CAESER-LISFLOOD (CLF) 모형을 이용한 해석 결과와 비교하였다. 모형의 검증 결과 해석해와 잘 일치된 모의 결과를 나타내었고, 가상 도메인에서의 흐름 해석도 타당한 것으로 평가되었다. 장호원 지역과 Sebou 강 지역에 대한 본 연구와 CLF 모형의 침수모의 결과는 침수심과 침수범위에서 서로 유사하게 나타났으며, 장호원 지역의 경우 홍수위험지도의 침수범위와도 유사한 값을 보였다. 본 연구와 CLF 모형의 모의결과에서 상이한 부분에 대해서는 각각의 모의결과를 비교 평가하였다. 연구결과 본 연구에서 제시된 모형은 홍수터에서의 침수 양상을 잘 모의할 수 있는 것으로 평가되었다. 그러나 본 연구에서 제시된 모형을 이용하여 침수해석을 할 경우에는 도메인 구성 방법과 지배방정식 및 해석 방법에 의한 모형의 특징과 한계점을 충분히 고려해야 할 것이다.

키워드
침수해석 모형
2차원
정형 사각 격자
유한체적법
병렬계산
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 52
  • No :5
  • Pages :361-372
  • Received Date : 2019-03-27
  • Revised Date : 2019-04-18
  • Accepted Date : 2019-04-18
  • DOI :https://doi.org/10.3741/JKWRA.2019.52.5.361
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