DYNAMIC WAVE MODEL FOR FLOOD INUNDATION SIMULATION IN A RIVER

摘要

FIAS (Flood Inundation Analysis System) using Arc/Info is developed and applied tothe Namhan River basin. The dynamic wave model for flood inundation analysis isstudied to handle simultaneous multiple overtopping and/or breaking of levee, toanalyze the risk of levee breach, and to estimate the inundation depth and extents.The model is applied to an actual levee breach case, which occurred on August23 27, 1995 in the Namhan River. Stage hydrographs inside and outside of thelevee are compared, and inundated discharges from overbank spilling are computed.Risks of levee overtopping are also computed. The Graphic User Interface isdeveloped with AML (Arc/Info Macro Language). Two- and three-dimensional floodinundation maps by Arc/Info are presented. The estimated inundation extents agreewith observations in terms of inundation depth and flooded area.