KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of the Application on Distributed Inundation Routing Model (SIMOD) Using MDM and FWA Method

다중흐름방향법과 평수가정법을 이용한 분포형 침수추적모형(SIMOD)의 적용성 평가

  • 김진혁 (국립강원대학교 방재전문대학원 도시.환경방재공학전공) ;
  • 이석호 (국립강원대학교 방재전문대학원 도시.환경방재공학전공) ;
  • 김병식 (국립강원대학교 소방방재학부/방재전문대학원 도시.환경방재공학전공)
  • Received : 2018.01.02
  • Accepted : 2018.02.22
  • Published : 2018.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

The study used the simplified flooding analysis model, SIMOD, to distribute the total flood discharge by time, so research on flooding in urban areas can be conducted. The conventional flooding analysis models have limitations in constructing input data and take a long time for analysis. However, SIMOD is useful because it supports rapid decision-making process using quick modeling based on simple hydrological data, such as topography and inflow flood of the study area, to analyze submerged routes formed by flooding. Therefore, the study used the SIMOD model to analyze flooding in urban areas before conducting a comparative study with the outputs from FLO-2D, which is one of the conventional flooding analysis models, to identify the model's applicability. Seongseoje was selected as the study area, as it is located downstream the Geumho river where streams flow in the adjacent areas, and dikes are high enough to apply the "Overflow and Break" scenario for urban areas. With regard to topography, the study applied DEM data for the conventional flooding analysis and DSM data to represent urban building communities, distribution of roads, etc. Input flood discharge was calculated by applying the rectangular weir equation under the bank and break scenario through a 200-year return period of a design flood level. Comparative analysis was conducted in a flooded area with a simulation time of 1-24 hours. The time for the 24-hour simulation in SIMOD was less than 7 minutes. Compared with FLO-2D, the difference in flooded areas was less than 20%. Furthermore, the study identified the need for topography data using DSM for urban areas, as the analysis result that applies DSM showed the influence of roads and buildings.

본 연구에서는 홍수총량을 시간에 따라 분포시키는 단순홍수범람해석 모형인 SIMOD(Simplified Inundation MODel)를 이용하여 도심지 침수분석을 실시하고자 하였다. 기존의 침수분석 모형들은 입력자료 구축이 어렵고, 분석시간이 오래 걸리는 등의 단점을 가지고 있다. SIMOD는 다중흐름방향법(Multi Direction Method, MDM)과 평수가정법(Flat-Water Assumption, FWA)의 두 흐름 방정식으로 홍수흐름을 단순화시킨 모형으로, 대상지역의 지형자료와 유입 홍수량 등 간단한 수문자료만을 이용하여 홍수범람에 의한 침수경로 분석이 가능하여 신속한 모델링으로 빠른 의사결정을 할 수 있다는 장점이 있다. 따라서 SIMOD 모형을 이용하여 도심지 침수분석을 실행한 뒤, 기존의 침수분석 모형인 FLO-2D 모형분석결과와 비교를 시행하여 모형의 적용성을 분석하였다. 대상지역은 도심지 지역의 제방 월류-파제 시나리오를 적용하기 위해 하천이 인접해 있고, 충분한 높이의 제방이 있는 금호강 하류에 위치한 성서제를 대상지역으로 선정하였으며, 지형자료는 기존의 침수분석에 사용하는 DEM지형자료와 도심지 건물군, 도로 분포 등을 표출할 수 있는 DSM지형자료를 이용하였다. 입력 홍수량은 200년 빈도계획홍수위를 기준으로 제방파제시나리오를 적용 사각웨어식을 적용하여 산정하였으며, 1~24시간의 모의시간과 침수면적을 비교 분석하였다. SIMOD의 경우 24시간 모의시간이 7분 안으로 나타났으며 면적차이는 FLO-2D와 비교했을 때 20% 내외로 나타났다. 또한 DSM을 이용하여 분석한 결과 도로나 건물의 영향이 반영되어 앞으로 도심지에서 DSM을 이용한 지형자료의 필요성을 확인하였다.

Keywords

References

  1. FLO-2D Software, Inc (2017). FLO-2D Reference Mannual, 100p.
  2. Go, D. H., Lee, K. H., Kim, J. M. and Kim, S. W. (2015). "FLO-2D simulation of the flood inundation zone in the case of failure of the sandae reservoir Gyeongju, Gyeongbuk." The Journal of Engineering Geology, Vol. 25, No. 49, pp. 449-458 (in Korean). https://doi.org/10.9720/kseg.2015.4.449
  3. Kim, B. H., Choi, S. Y. and Han, K. Y. (2011). "An analysis method of 1D hydrodynamic model based on GIS for flood inundation mapping." Korean Society of Hazard Mitigation, Vol. 11, No. 6, pp. 227-235 (in Korean). https://doi.org/10.9798/KOSHAM.2011.11.6.227
  4. Kim, B. S. and Ha, S. R. (2013). "The impact assessment of climate change on design flood in mihochen basin based on the representative concentration pathway climate change scenario." Journal of Wetlands Research, Vol. 15, No. 1, pp. 105-114. https://doi.org/10.17663/JWR.2013.15.1.105
  5. Kim, D. H., Jang, D. W., Park, H. S. and Choi, G. W. (2014). "A study on flood impact upon the downstream area of a river by dam break." Crisis and Emergency Management: Theory and Praxis, Vol. 10, No. 2, pp. 117-132 (in Korean).
  6. Lee, J. T., Jeon, W. J. and Hur, S. C. (2006). "Analysis of inundation characteristics for EAP of highway in urban stream - Dongbu highway in jungrang stream -." Korean Society of Hazard Mitigation, Vol. 6, No. 3, pp. 69-76 (in Korean).
  7. Lee, S. H., Lee, D. S., Kim, J. M. and Kim, B. S. (2016). "Development of distributed inundation routing method using SIMOD method." Korea Water Resources Association, Vol. 49, No. 49, pp. 579-588 (in Korean). https://doi.org/10.3741/JKWRA.2016.49.7.579
  8. Ministry of Land, Infrastructure and Transport (1997). Kumho River Maintenance Basic Plan (in Korean).
  9. Ministry of Land, Infrastructure and Transport (2009). Nakdong River Water System Basic Plan (in Korean).
  10. Nanshan, Z., Yasuto, T. and Kaoru, T. (2007). "Simplified flood inundation model integration with rainfall-runoff processes." Annuals of Disas. Pres. Res. Inst., Kyoto Unic., Vol. 50, pp. 75-78.
  11. Park, J. H., Han, K. Y. and Ahn, K. H. (2009). "Development of numerical model to analyze levee break." Korea Water Resources Association, Vol. 38, No. 4, pp. 259-269 (in Korean).
  12. Pathirana, A., Tsegaye, S., Gersonius, B. and Vairavamoorthy, K. (2011). "A simple 2-D inundation model for incorporating flood damage in urban drainage planning." Hydrology and Earth System Sciences, Vol. 15, pp. 2747-2761. https://doi.org/10.5194/hess-15-2747-2011
  13. Syme, W. J., Pinnell, M. G. and Wicks, J. M. (2004). Modelling flood inundation of urban areas in the UK using 2D/1D hydraulic models, The institution of Engineers, Australia 8th National Conference on Hydraulics in Water Engineering.
  14. Yang, T. H., Chen, T. C., Chang, Y. C., Yang, S. C. and Ho, J. Y. (2015). "Comparison of different grid cell ordering approaches in a simplified inundation model." Water, Vol. 7, pp. 438-454. https://doi.org/10.3390/w7020438