Īmirebrahimi S, Rajabifard A, Mendis P, Ngo T (2016) A BIM-GIS integration method in support of the assessment and 3D visualisation of flood damage to a building. Īerts JC, Wouter Botzen W (2011) Flood-resilient waterfront development in New York City: bridging flood insurance, building codes, and flood zoning. LBDA should use a low-resolution DEM without the BB method, which can account for model computation efficiency and flood risk management.Īdeogun AG, Daramola MO, Pathirana A (2015) Coupled 1D–2D hydrodynamic inundation model for sewer overflow: influence of modeling parameters. The high-resolution DEM with BB method should be used for HBDA. Generally, a city can be divided into different areas according to building densities. DEM 1 could be used for BFE and DFE mapping to save computing power. The water levels rise effect on buildings was less pronounced in a low building density area (LBDA). From a risk management perspective, BFE and DFE mapping should adopt DEM 3. Because buildings in a high building density area (HBDA) had adopted dry floodproofing, the water level rose when the subcritical flow flowed by the buildings. Compared to the observed flooding depths from the water level gauge, the simulation results with DEMs 1 and 2 were closer to the actual situation than that with DEM 3, as DEMs 1 and 2 could represent the water storage effect in buildings. DEMs 2 and 3 were 1-m resolution DEMs without and with the BB method, respectively. DEM 1 was a 20-m resolution DEM without the building block (BB) method. This study proposes a high-resolution BFE and DFE mapping in the densely populated city of Tainan in Taiwan using the SOBEK model and hydraulic digital elevation model. Previous BFE and DFE mapping methods were mainly applied to inland rivers and coastal areas, and few studies mentioned the mapping method of densely populated cities. Base flood elevation (BFE) and design flood elevation (DFE) are essential references for building floodproofing.
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