SWMM과 FLUMEN을 연계한 수영·망미 저지대의 침수분석

Abstract

The recent rainfall patten in Korea shows the total amount of rainfall has increased and the total number of heavy rain day has increased. Therefore, the damage resulted from flood disaster has been dramatically increased. The purpose of this research is flooding analysis in an urban area using SWMM (Storm Water Management Model) liked with FLUMEN (FLUvial Model Engine). The study area is Suyeong-Mangmi lowland area, Busan, Korea. Suyeong-Mangmi lowland area has been flooding hazard zone since 1995. The last flooding cases of this area occurred on July 7th and 16th, 2009, and those flooding cases were analyzed in this study. The first step of computation is calculating flooding hydrographs from storm sewers using the urban runoff simulation model of SWMM. The flooding hydrographs are used in the inundation analysis model of FLUMEN. The results of inundation analysis were compared with the real flooding situation of the study area. The real maximum inundation depth was guessed by 0.5 m or more on July 16th. The computation yields the maximum inundation depth of 1.8 m and the result was overestimated. the errors may be resulted from the runoff simulation and incapability of simulation using FLUMEN for flow into buildings. The models and procedures used in this study can be applied to analysis of flooding resulted from serve rainfall and insufficiency of drainage capacity.