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http://dx.doi.org/10.3741/JKWRA.2017.50.5.315

Analysis of changes of flood inundation depth and area according to channel migration and river improvement using HEC-GeoRAS  

Ji, Moon Hwan (Department of Civil & Environmental Engineering, University of Ulsan)
Cho, Hong-Je (Department of Civil & Environmental Engineering, University of Ulsan)
Publication Information
Journal of Korea Water Resources Association / v.50, no.5, 2017 , pp. 315-324 More about this Journal
Abstract
In this study, the HEC-GeoRAS model was used to estimate the changes of flood inundation depth and area of the Hyeoam-cheon basin after the channel migration and river improvement. The target area was extremely damaged due to the heavy rainfall on 25th August, 2014 after the costruction. According to the results of the analysis, the HEC-GeoRAS model can be used to accurately estimate the changes of flood innundation depth and area in agrecultural lands and lowlands of which the topographic changes and elevation differences are small. The inundation depths were increased 0.99 m in heavy rainfall and 0.39 m in 100 year frequency flood. The inundation areas in 100 year frequency flood were reduced in inundation depths under 1.5 m while they were increased in depths above 4.5 m. It was concluded that the loss of natural resevoir capacity of agricultural lands and lowlands due to the channel migration and river improvement caused the damage of flood in 2014 and the decrease of actual effective widths of the channel added the damage.
Keywords
HEC-GeoRAS model; Flood inundation area; Channel migration; Heavy rainfall;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Hong, S. H., and Sim, M. G. (2009). "Practical application technique of flooding inundation using HEC-GeoRAS." Journal of Korea Water Resources Association, KWRA, Vol. 42, No. 4, pp. 31-38.
2 Kim, K. H., Shin, H. S., Jung, S. H., and Kim, J. S. (2012). "Comparative study on flood inundation according to river terrain modification." Journal of Korea Water Resources Association, KWRA, Proceeding pp. 251-255.
3 Lee, J. S., Moon, C. G., Kim, S. D., Cho, S. G., and Shin, S. C. (2012). "A study on construction techniques of river topography for flood inundation analysis." Journal of the Korea Geo-Environmental Society, KGES, Vol. 13, No. 5, pp. 59-68.
4 Moon, C. G., Lee, J. S., Cho, S. G., and Shin, S. C. (2014). "Comparison of flood inundation models using topographic feature." Journal of the Korea Geo-Environmental Society, KGES, Vol. 15, No. 1, pp. 69-77.
5 Park, J. D., and Choi, J.M. (2011). "Flood area estimation and evacuation path analysis." Journal of Korea Spatial Information Society, KSIS, Vol. 19, No. 1, pp. 1-11.
6 Ulsan Metropolitan City (2001). Basic plan for the Hyeoam-cheon and Wiyang-cheon Maintenance.
7 Yang, W. S., and Yang, S. K. (2013). "Stream flood analysis of dry stream on flood runoff in Islands." Journal of Environmental Science International, Vol. 22, No. 5, pp. 571-580.   DOI