EFFICIENT NUMERICAL MODELING OF STORM SURGE INUNDATION OVER METROPOLIS USING INDIVIDUAL DRAG FORCE MODEL AND ADAPTIVE MESH REFINEMENT

Abstract

 The individual Drag Force Model (iDFM), a subgrid-scale model that treats groups of buildings in a grid as drag forces, is developed and coupled with the AMR method, in which the computational grid size is refined in time and space, to develop an efficient numerical model of storm surge inundation over metropolis including different scales phenomena. The results of the structure resolving model, which treats buildings as topographic features, were used as true values for the inundation calculations, and a comparison of the inundation characteristics was conducted. The reproducibility of the momentum flux in the area where buildings are densely built and the flow velocity is generally reduced is good, but the reproducibility in the area where the momentum flux and inundation depth increase locally along the road is an issue to be improved.