Author(s): Hong Jun Bum; Kim Hyung Sik; Hyung Ha Seoh; Kim Hung Soo
Linked Author(s):
Keywords: Gulpo-cheon; Flood flow conveyance; Urban rainfall-runoff model; XP-SWMM
Abstract: In recent, increasing of the impervious area gives rise to short concentration time and high peak discharge comparing with natural watershed and it is a cause of urban flood damage. Therefore, we have made the structural and non-structural plans to reduce the damage from inundation. The Gulpo-cheon basin had been frequently inundated and damaged due to the water level of Han river, Korea. So, the diversion channel or floodway of the Gulpo-cheon which is a tributary of Han river was constructed with the width of 20 meters for flood control in the basin but it was not enough for our expectation and now we have a plan to expand the floodway to 80 meters. We use a XP-SWMM model developed based on EPA-SWMM version for analyzing the capacity of flood conveyance by the expansion of Gulpo-cheon floodway with the same 100 years return period design storm and the same tidal conditions of the Yellow sea. The flood conveyance after the expansion of floodway becomes three times comparing it with before the expansion. Also we simulate the flood discharge at the diversion point of Gulpo-cheon for the expanded condition of floodway and know that the discharge of about 300m3/sec is flowing backward to the expanded floodway. Therefore we may need some kinds of hydraulic structures to prevent the back water.
Year: 2005