Influence of Uncertainties in DEM Resolution and Surface Friction to the Building Treatment Methods in Urban Inundation Modelling

Abstract

This study evaluates the influence of uncertainties in DEM resolution and surface friction to building treatment method by conducting several simulations with various input parameters. A common two-dimensional hydrodynamic model is applied in a study area to produce the inundation results for every simulation. Comparison analysis between the simulation results and observed data suggest that the performance of building treatment method and urban inundation modeling is affected by the uncertainties in DEM resolution and surface friction. Moreover, different building treatment methods show disparity in sensitivity to the changes in model input. In practical terms, we can choose one of these methods based on the practical conditions, including available data, basin conditions and time constraints. The findings in this study are important for improving urban inundation models and for using their predictions in decision-making for various urban environments, which may provide some valuable insights into the flood management and risk assessment for the urban sites.