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Water 2016, 8(11), 494; doi:10.3390/w8110494

A Simple and Robust Method for Simultaneous Consideration of Overland and Underground Space in Urban Flood Modeling

1
National Disaster Management Research Institute, 365 Jongga-ro, Ulsan 44538, Korea
2
Disaster Prevention Research Institute, Kyungpook National University, 80 Daehak-ro, Buk-gu Daegu 41566, Korea
3
Department of Civil Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu Daegu 41566, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Brigitte Helmreich
Received: 2 August 2016 / Revised: 4 October 2016 / Accepted: 24 October 2016 / Published: 1 November 2016
(This article belongs to the Special Issue Urban Drainage and Urban Stormwater Management)
View Full-Text   |   Download PDF [16167 KB, uploaded 1 November 2016]   |  

Abstract

This study proposed two methods, boundary-type and pond-type, to link overland and underground space in urban flood modeling. The boundary-type treats the exit of underground space as an interface for inflow of floodwater by imposing open boundary condition and pond-type considers underground space as an underground pond by configuring pond terrain. The effect of underground space in urban flood inundation was examined by coupling one-dimensional (1D) stormwater management model (SWMM) and two-dimensional (2D) overland flood model. The models were applied to the Hyoja drainage basin, Seoul, Korea where urban flood occurred due to heavy rainfall in 21 September 2010. The conduit roughness coefficient of SWMM was calibrated to minimize the difference between observed and predicted water depth of pipe. In addition, the surface roughness coefficient of 2D model was calibrated by comparing observed and predicted flood extent. Then, urban flood analysis was performed on three different scenarios involving a case not considering underground (Case 1) and cases considering underground, boundary-type (Case 2) and pond-type (Case 3). The simulation results have shown that the boundary-type is simple but robust method with high computational efficiency to link overland and underground space in urban flood modeling. View Full-Text
Keywords: underground space; 1D SWMM; 2D flood model; urban flooding underground space; 1D SWMM; 2D flood model; urban flooding
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Son, A.-L.; Kim, B.; Han, K.-Y. A Simple and Robust Method for Simultaneous Consideration of Overland and Underground Space in Urban Flood Modeling. Water 2016, 8, 494.

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