Abstract
Urban flood modeling benefits from new remote sensing technologies, which provide high-resolution data and allow the consideration of small-scale urban key features. Since high-resolution data often result in large simulation runtimes, coarsening of the 2D grid via resampling techniques can be used to achieve a good balance between accuracy and computation time. However, the representation of urban features and topographical properties degrades, since small-scale features are blurred. Therefore, narrow flow paths between buildings are often not considered, building’s sizes are overestimated, and their arrangement in the grid changes. Thus, flow paths change and waterways are blocked, leading to incorrect inundations around buildings. This paper develops a method to improve the simulation results of coarser grids by adding virtual surface links (VSL) between buildings. The VSL mimic the flow paths of a high-resolution model in the areas of interest. The approach is developed for dual-drainage 1D/2D models. The approach shows a visible improvement at the localized level where the VSL are applied, in terms of under/overestimating flooding and a moderate overall improvement of the simulation results. Relatively to the model resolution of 2 m, the computational time, by applying this method, is reduced by 93.6% when using a 5 m grid and by 99% when using a 10 m grid. For a small test case, where the local effects are investigated, the error in the maximum water volume, relative to a grid size of 2 m, is reduced from 69.63% to 5.03% by using a 5 m grid and from 152.75% to 22.92% for a 10 m grid.
Highlights
Flash floods, resulting from heavy rainfall events, constitute a serious risk to urban areas [1]
Since high-resolution data often result in large simulation runtimes, coarsening of the 2D grid via resampling techniques can be used to achieve a good balance between accuracy and computation time
This paper develops a method to improve the simulation results of coarser grids by adding virtual surface links (VSL) between buildings
Summary
Flash floods, resulting from heavy rainfall events, constitute a serious risk to urban areas [1]. 2D hydraulic models and high-resolution data are necessary for an accurate representation of urban key features and 2D flood routing. A compromise between computation time and accuracy is required Established resampling techniques, such as nearest, bilinear, or cubic, can be used to coarsen the digital terrain model (DTM) resolution and reduce the runtime [8]. The grid values of a finer grid are interpolated to generate a new raster dataset with a different resolution This approach leads to an undesired degradation in the representation of urban features, including the shape, location, and elevation of such features [9]. Resampling techniques reduce the heterogeneity and complexity of the topography, resulting in a change in the flood wave travel time and the spatial distribution of potential floodplains [7,12]
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