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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Comparison of flood zones and evaluation of water depths of buildings for the flood of July 2021 in the Vesdre watershed

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Mannoni, Pablo ULiège
Promotor(s) : Dewals, Benjamin ULiège
Date of defense : 26-Jan-2024 • Permalink : http://hdl.handle.net/2268.2/19562
Details
Title : Comparison of flood zones and evaluation of water depths of buildings for the flood of July 2021 in the Vesdre watershed
Translated title : [fr] Comparaison des zones inondées et évaluation des hauteurs d'eau sur les bâtiments pour l'inondation de juillet 2021 dans le bassin de la Vesdre
Author : Mannoni, Pablo ULiège
Date of defense  : 26-Jan-2024
Advisor(s) : Dewals, Benjamin ULiège
Committee's member(s) : Pirotton, Michel ULiège
Erpicum, Sébastien ULiège
Archambeau, Pierre ULiège
Language : English
Number of pages : 105
Discipline(s) : Engineering, computing & technology > Civil engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master : ingénieur civil des constructions, à finalité spécialisée en "urban and environmental engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] This master thesis addresses the mapping of flood extents and water depths in the Vesdre watershed, Wallonia, in response to unprecedented floods in July 2021.

The study emphasizes the significance of comparing outcomes from a sophisticated 2D model (WOLF2D) with a simplified conceptual approach implemented by the SPW, which involves superimposing diverse data sources. The SPW cartography integrates digitalisation primarily based on aerial photos and a modeling created with an inverse distance weighting interpolation utilizing water depths from buildings measured by SPW employees.

The comparison, facilitated by coefficients of correlation considering the size of evaluated wet and dry areas, reveals satisfactory global and local similarities at the Vesdre watershed scale. However, notable discrepancies emerge, particularly in highly urbanized areas where WOLF exhibits complexity, and in rural areas distant from measured water depths for the SPW modeling. This modeling tends to overestimate flood extents and water depths globally, struggling with dynamic flood effects and relying predominantly on topography. In Verviers, the complexity of the built-up environment contributes to poor correlation coefficients. Indicators comparing measured water depths of SPW buildings and WOLF-simulated water depths demonstrate varying results. A nuanced analysis, adjusting parameters such as minimal water depth consideration, zone dimensions around buildings, and riverbed inclusion, permits a closer alignment of the WOLF water depths with the on-site measurements. Pepinster and Eupen both located on a confluence of two important streams present results with high errors.

Lastly, through a literature review of 0D methods also called simple conceptual approaches compared to 2D models, the results of SPW modeling are considered quite favorable.


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Author

  • Mannoni, Pablo ULiège Université de Liège > Master ing. civ. constr. fin. spéc. urb. env. eng.

Promotor(s)

Committee's member(s)

  • Pirotton, Michel ULiège Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
    ORBi View his publications on ORBi
  • Erpicum, Sébastien ULiège Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
    ORBi View his publications on ORBi
  • Archambeau, Pierre ULiège Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
    ORBi View his publications on ORBi
  • Total number of views 15
  • Total number of downloads 1










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