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Flood impact assessment in urban settings with porous buildings – insights from a fine-scale hydraulic-economic model

Author

Listed:
  • David Nortes Martínez

    (UMR G-EAU - Gestion de l'Eau, Acteurs, Usages - Cirad - Centre de Coopération Internationale en Recherche Agronomique pour le Développement - BRGM - Bureau de Recherches Géologiques et Minières - IRD - Institut de Recherche pour le Développement - AgroParisTech - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement - Institut Agro Montpellier - Institut Agro - Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement)

  • Frédéric Grelot

    (UMR G-EAU - Gestion de l'Eau, Acteurs, Usages - Cirad - Centre de Coopération Internationale en Recherche Agronomique pour le Développement - BRGM - Bureau de Recherches Géologiques et Minières - IRD - Institut de Recherche pour le Développement - AgroParisTech - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement - Institut Agro Montpellier - Institut Agro - Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement)

  • Cécile Choley

    (ENGEES - École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg, ICube - Laboratoire des sciences de l'ingénieur, de l'informatique et de l'imagerie - ENGEES - École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg - UNISTRA - Université de Strasbourg - HUS - Hôpitaux Universitaires de Strasbourg - INSA Strasbourg - Institut National des Sciences Appliquées - Strasbourg - INSA - Institut National des Sciences Appliquées - CNRS - Centre National de la Recherche Scientifique - MNGE - Matériaux et Nanosciences Grand-Est - UNISTRA - Université de Strasbourg - Université de Haute-Alsace (UHA) - Université de Haute-Alsace (UHA) Mulhouse - Colmar - INSERM - Institut National de la Santé et de la Recherche Médicale - INC-CNRS - Institut de Chimie - CNRS Chimie - CNRS - Centre National de la Recherche Scientifique - Réseau nanophotonique et optique - UNISTRA - Université de Strasbourg - Université de Haute-Alsace (UHA) - Université de Haute-Alsace (UHA) Mulhouse - Colmar - CNRS - Centre National de la Recherche Scientifique)

  • Pascal Finaud-Guyot

    (HSM - Hydrosciences Montpellier - IRD - Institut de Recherche pour le Développement - INSU - CNRS - Institut national des sciences de l'Univers - CNRS - Centre National de la Recherche Scientifique - UM - Université de Montpellier)

Abstract

. Classical hydraulic approaches of urban floods consider buildings as obstructions to water flow, without considering the flow exchanges between streets and buildings. Since the hydraulic behavior within the building is not considered, there exists a gap on the available information regarding the fine characterization of material damage and human exposure within buildings. Because of this gap, damage estimation usually assumes that the floodwater depths inside and outside the buildings are the same. However, as flood damage functions are very elastic with respect to floodwater depth, especially in the lower values, relatively small differences in water depth can lead to large differences in the assessment of material damage. Not considering street-building flow exchanges might be introducing a bias in the estimation of property damage. In this paper, we propose to analyse how fine-scale hydraulic and economic modelling approaches considering street-building flows can influence the characterization of material damage at a larger scale (district). To do so, we couple a hydraulic model with an economic model to simulate water depths and to estimate flood damage under: (i) a classical approach using non-porous buildings and (ii) an alternative approach explicitly considering street-building flow exchanges. The results obtained show rather notable differences in floodwater depth and economic damage at both building and district level.

Suggested Citation

  • David Nortes Martínez & Frédéric Grelot & Cécile Choley & Pascal Finaud-Guyot, 2024. "Flood impact assessment in urban settings with porous buildings – insights from a fine-scale hydraulic-economic model," Post-Print hal-04551801, HAL.
  • Handle: RePEc:hal:journl:hal-04551801
    DOI: 10.5194/piahs-385-247-2024
    Note: View the original document on HAL open archive server: https://hal.inrae.fr/hal-04551801v1
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    References listed on IDEAS

    as
    1. Vasilis Bellos & George Tsakiris, 2015. "Comparing Various Methods of Building Representation for 2D Flood Modelling In Built-Up Areas," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 29(2), pages 379-397, January.
    2. David Nortes Martínez & Frédéric Grelot & Cécile Choley & Pascal Finaud-Guyot, 2022. "Flood impact assessment in urban context: Coupling hydraulic and economic models for a fine scale damage assessment," Post-Print hal-03623946, HAL.
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