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Micro-scale flood risk analysis based on detailed 2D hydraulic modelling and high resolution geographic data

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Abstract

The paper presents a consistent micro-scale flood risk analysis procedure, relying on detailed 2D inundation modelling as well as on high resolution topographic and land use database. The flow model is based on the shallow-water equations, solved by means of a finite volume scheme on multi-block structured grids. Using highly accurate laser altimetry, the simulations are performed with a typical grid spacing of 2 m, which is fine enough to represent the flow at the scale of individual buildings. Consequently, the outcomes of hydraulic modelling constitute suitable inputs for the subsequent exposure analysis, performed at a micro-scale using detailed land use maps and geographic database. Eventually, the procedure incorporates social flood impact analysis and evaluation of direct economic damage to residential buildings. Besides detailing the characteristics and performance of the hydraulic model, the paper describes the flow of data within the overall flood risk analysis procedure and demonstrates its applicability by means of a case study, for which two different flood protection measures were evaluated.

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Acknowledgment

Part of this research was carried out on behalf of the Belgian Science Policy (BELSPO), in the framework of the research program “Science for a Sustainable Development”. The authors also gratefully acknowledge the “Service Public de Wallonie” (SPW) for the Digital Surface Model and other data.

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Authors and Affiliations

  1. Department ArGEnCo, Unit of Hydrology, Applied Hydrodynamics and Hydraulic Constructions, University of Liege, Liege, Belgium

    Julien Ernst, Benjamin J. Dewals, Sylvain Detrembleur, Pierre Archambeau, Sébastien Erpicum & Michel Pirotton

  2. Fund for Scientific Research, F.R.S.-FNRS, Brussels, Belgium

    Benjamin J. Dewals

Authors
  1. Julien Ernst
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  2. Benjamin J. Dewals
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  3. Sylvain Detrembleur
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  4. Pierre Archambeau
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  5. Sébastien Erpicum
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  6. Michel Pirotton
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Correspondence to Benjamin J. Dewals.

Additional information

J. Ernst, B. J. Dewals have contributed equally to this article.

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Ernst, J., Dewals, B.J., Detrembleur, S. et al. Micro-scale flood risk analysis based on detailed 2D hydraulic modelling and high resolution geographic data. Nat Hazards 55, 181–209 (2010). https://doi.org/10.1007/s11069-010-9520-y

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