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Development of a Raster-based Two-dimensional Flood Inundation Model  

Lee, Gi-Ha (충남대학교 토목공학과 건설방재연구소)
Lee, Seung-Soo (충남대학교 토목공학과)
Jung, Kwan-Sue (충남대학교 토목공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.10, no.6, 2010 , pp. 155-163 More about this Journal
Abstract
The past researches on flood inundation simulation mainly focused on development of numerical models based on unstructured mesh networks to improve model performances. However, despite the accurate simulation results, such models are not suitable for real-time flood inundation forecasting due to a huge computational burden in terms of geographic data processing. In addition, even though various types of vector and raster data are available to be compatible with flood inundation models for post-processes such as flood hazard mapping and flood inundation risk analysis, the unstructured mesh-based models are not effective to fully use such information due to data incommensurability. Therefore, this study aims to develop a raster-based two-dimensional inundation model; it guarantees computational efficiency because of direct application of DEM for flood inundation modeling and also has a good compatibility with various types of raster data, compared to a commercial model such as FLUMEN. We applied the model to simulate the BaekSan levee break in the Nam river during a flood period from August 10 to 13, 2002. The simulation results showed a good agreement with the field-surveyed inundation area and were also very similar with results from the FLUMEN. Moreover, the model provided physically-acceptable velocity vectors with respect to inundating and returning flows due to the difference of water level between channel and lowland.
Keywords
BaekSan levee break; raster-based 2D numerical model; Flood inundation; FLUMEN; SRTM DEM;
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Times Cited By KSCI : 3  (Citation Analysis)
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