Modelling floods in urban areas and representation of buildings with a method based on adjusted conveyance and storage characteristics

Journal article (2013)

Authors

Zoran Vojinovic IHE Delft Institute for Water Education
Solomon Seyoum IHE Delft Institute for Water Education
Mwanaisha H. Salum IHE Delft Institute for Water Education
Roland K. Price IHE Delft Institute for Water Education
Ahmad K. Fikri IHE Delft Institute for Water Education
Y.A. Abebe IHE Delft Institute for Water Education
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External organisation
Topography Urban areas Flood modelling Spatial resolution 2D models
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Published Date

2013

Language

English

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Abstract

The present paper reviews several approaches that can be used in capturing urban features in coarse resolution two-dimensional (2D) models and it demonstrates the effectiveness of a new approach against the straightforward 2D modelling approach on a hypothetical and a real-life case study work. The case study work addresses the use of coarse grid resolutions in 2D non-inertia models. The 2D noninertia model used solves continuity andmomentumequations over the cells of the coarse model while taking the minimum elevation as a surface level. The volume stored in every cell is calculated as a volume-depth relationship. In order to replicate restriction in conveyances in x-y directions of fine resolution models due to building blocks, the friction values of the coarse-resolution model are adjusted to match the results of the high-resolution model. The work presented in this paper shows the possibility of applying a 2D non-inertia model more effectively in urban flood modelling applications whilst still making use of the high resolution of topographic data that can nowadays be easily acquired.