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http://dx.doi.org/10.3741/JKWRA.2008.41.9.929

Connection of Hydrologic and Hydraulic Models for Flood Forecasting in a Large Urban Watershed  

Yoon, Seong-Sim (Dept. of Civil and Environmental Engrg., Sejong Univ)
Choi, Chul-Kwan (Disaster Prevention Safety Institute Co., Ltd)
Bae, Deg-Hyo (Dept. of Civil and Environmental Engrg., Sejong Univ)
Publication Information
Journal of Korea Water Resources Association / v.41, no.9, 2008 , pp. 929-941 More about this Journal
Abstract
The objectives of this study are to propose a system for combined use of a hydrologic and a hydraulic model for urban flood forecast model and to evaluate the system on the $300km^2$ Jungrang urban watershed area, which is relatively large area as an urban watershed and consequently composed of very complex drainage pipes and streams with different land uses. In this study, SWMM for hydrologic model and HEC-RAS for hydraulic model are used and the study area is divided into 25 subbasins. The SWMM model is used for sewer drainage analysis within each subbasin, while HEC-RAS for unstready flow analysis in the channel streams. Also, this study develops a GUI system composed of mean areal precipitation input component, hydrologic runoff analysis component, stream channel routing component, and graphical representation of model output. The proposed system was calibrated for the model parameters and verified for the model applicability by using the observation data. The correlation coefficients between simulated and observed flows at the 2 important locations were ranged on 0.83-0.98, while the coefficients of model efficiency on 0.60-0.92 for the verification periods. This study also provided the possibilities of manhole overflows and channel bank inundation through the calculated water profile of longitudinal and channel sections, respectively. It can be concluded that the proposed system can be used as a surface runoff and channel routing models for urban flood forecast over the large watershed area.
Keywords
urban flood; flood forecasting; SWMM; HEC-RAS;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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