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http://dx.doi.org/10.21729/ksds.2018.11.2.45

Numerical Simulation of the Flood Event Induced Temporally and Spatially Concentrated Rainfall - On August 17, 2017, the Flood Event of Cheonggyecheon  

Ahn, Jeonghwan (Dept. of Civil and Environmental Engineering, Induk Univ.)
Jeong, Changsam (Dept. of Civil and Environmental Engineering, Induk Univ.)
Publication Information
Journal of Korean Society of Disaster and Security / v.11, no.2, 2018 , pp. 45-52 More about this Journal
Abstract
This study identifies the cause of the accident and presents a new concept for safe urban stream management by numerical simulating the flood event of Cheonggyecheon on August 17, 2017, using rain data measured through a dense weather observation network. In order to simulate water retention in the CSO channel listed as one of the causes of the accident, a reliable urban runoff model(XP-SWMM) was used which can simulate various channel conditions. Rainfall data measured through SK Techx using SK Telecom's cell phone station was used as rain data to simulate the event. The results of numerical simulations show that rainfall measured through AWSs of Korea Meteorological Administration did not cause an accident, but a similar accident occurred under conditions of rainfall measured in SK Techx, which could be estimated more similar to actual phenomena due to high spatial density. This means that the low spatial density rainfall data of AWSs cannot predict the actual phenomenon occurring in Cheonggyecheon and safe river management needs high spatial density weather stations. Also, the results of numerical simulation show that the residual water in the CSO channel directly contributed to the accident.
Keywords
Cheonggyecheon; XP-SWMM; AWS; Safe river management; High spatial density weather stations;
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  • Reference
1 Seoul Metropolitan Facilities Management Corporation (2005- 2010). A Study on Monitoring of Cheonggyecheon Stream.
2 Promoting Headquarters of Cheonggyecheon Restoration (2005). Cheonggyecheon Restoration Project.
3 Chen, D., Ou, T. H., Gong, L. B., Xu, C.-Y., Li, W. J., Ho, C.-H., and Qian, W. H. (2010). "Spatial interpolation of daily precipitation in China: 1951-2005." Advances in Atmospheric Sciences, Vol. 27, No. 6, pp. 1221-1232.   DOI
4 Choi, G. Y., Kwon, W. T., Boo, K. O. and Cha, Y. M. (2008). "Recent spatial and temporal changes in means and extreme events of temperature and precipitation across the republic of Korea." The Korean Geographical Society, Vol. 43, No. 5, pp. 681-700.
5 Kim, J. S., Sung, H. H. and Choi, G. Y. (2013). "Spatial patterns of urban flood vulnerability in Seoul." The Korean Geographical Society, Vol. 19, No. 4, pp. 615-626.
6 Michaud, J. D. and Sorooshian, S. (1994). "Effect of rainfall-sampling errors on simulations of desert flash floods." Water Resources Research, Vol. 30. pp. 2765-2775.   DOI
7 St-Hilaire, A., Ouarda, T.B.M.J., Lachance, M., Bobee, B., Gaudet, J., and Gignac, C. (2003). "Assessment of the impact of meteorological network density on the estimation of basin precipitation and runoff: a case study." Hydrological Processes, Vol. 17, pp. 3561-3580.   DOI
8 Wilson, J. W. and Brandes, E. A. (1979). "Radar measurement of rainfall-a summary." American Meteorological Society, Vol. 60, No. 9, pp. 1048-1058.   DOI
9 Yoon, S. K. (2012). "Flood risk and vulnerability analysis in an urban stream by climate change." University of Seoul, Graduate Doctoral Dissertation.