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http://dx.doi.org/10.3741/JKWRA.2007.40.6.447

The Study on the Development of Flood Prediction and Warning System at Ungaged Coastal Urban Area - On-Cheon Stream in Busan -  

Shin, Hyun-Suk (Dept. of Civil Engineering, Pusan Univ.)
Park, Yong-Woon (Korea Institute of Construction Technology)
Hong, Il-Pyo (Korea Institute of Construction Technology)
Publication Information
Journal of Korea Water Resources Association / v.40, no.6, 2007 , pp. 447-458 More about this Journal
Abstract
In this study, the coastal urban flood prediction and warning system based on HEC-RAS and SWMM were investigated to evaluate a watershed of On-Cheon stream in Busan which has characteristics of costal area cased by flooding of coastal urban areas. The basis of this study is a selection of various geological data from the numerical map that is a watershed of On-Cheon stream and computation of hydrologic GIS data. Thiessen method was used for analyzing of rainfall on the On-Cheon stream and 6th regression equation, which is Huff's Type II was time-distribution of rainfall. To evaluate the deployment of flood prediction and warning system, risk depth was used on the 3 selected areas. To find the threshold runoff for hydraulic analysis of stream, HEC-RAS was used and flood depth and threshold runoff was considered with the effect of tidal water level. To estimate urban flash flood trigger rainfall, PCSWMM 2002 was introduced for hydrologic analysis. Consequently, not only were the criteria of coastal urban flood prediction and warning system decided on the watershed of On-Cheon stream, but also the deployment flow charts of flood prediction and warning system and operation system was evaluated. This study indicates the criteria of flood prediction and warning system on the coastal areas and modeling methods with application of ArcView GIS, HEC-RAS and SWMM on the basin. For the future, flood prediction and warning system should be considered and developed to various basin cases to reduce natural flood disasters in coastal urban area.
Keywords
Flood Prediction and Warning; SWMM; Huff's Distribution; Risk Depth; Threshold Runoff; Flash Flood Trigger Rainfall;
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