Article (Scientific journals)
2D and 3D Computational Modeling of Surface Flooding in Urbanized Floodplains: Modeling Performance for Various Building Layouts
Li, Xuefang; Dellinger, Guilhem; Erpicum, Sébastien et al.
2024In Water Resources Research
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Keywords :
urban flooding; 3D modelling; flow structure; flow recirculation; experimental observations; 2D modelling
Abstract :
[en] Understanding the strengths and limitations of the modelling capacity of urban flooding is of utmost importance as such events are becoming increasingly frequent and extreme. In this study, we assess two computational models against laboratory observations of urban flooding in a reduced-scale physical model of an idealized urban district. Four urban layouts were considered, involving each three inlets and three outlets, as well as a combination of three- and four-branch crossroads together with open spaces. The first model (2D) solves the shallow-water equations, while the second one (3D) solves the Reynolds-averaged Navier-Stokes equations. Both models accurately predict the flow depths in the inlet branches. For the discharge partition between the outlets, deviations between the computations and the laboratory observations remain close to the experimental uncertainties (maximum 2.5 percent-points). The velocity fields computed in 3D generally match the measured surface velocity fields. In urban layouts involving mostly a network of streets, the depth-averaged velocity fields computed by the 2D model agree remarkably well with those of the 3D model, with differences not exceeding 10%, despite the presence of helicoidal flow (revealed by the 3D computations). In configurations with large open areas, the 3D model captures generally well the trajectory and velocity distribution of the main surface flow jet and recirculations; but the 2D model does not perform as well as it does in relatively channelized flow regions. Visual inspection of the jet trajectories computed by the 2D model in large open areas reveals that they substantially deviate from the observations.
Research center :
UEE - Urban and Environmental Engineering - ULiège [BE]
Disciplines :
Civil engineering
Author, co-author :
Li, Xuefang ;  Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Dellinger, Guilhem;  National school for water and environmental engineering, Strasbourg, France > ICube laboratory
Erpicum, Sébastien  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Chen, Lihua;  Guangxi University, Nanning, China > Guangxi Key Laboratory of Disaster Prevention and Engineering Safety
Yu, Shuyue;  Guangxi University, Nanning, China > Guangxi Key Laboratory of Disaster Prevention and Engineering Safety
Guiot, Léo;  National school for water and environmental engineering, Strasbourg, France > ICube laboratory
Archambeau, Pierre  ;  Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Pirotton, Michel ;  Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Dewals, Benjamin  ;  Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Language :
English
Title :
2D and 3D Computational Modeling of Surface Flooding in Urbanized Floodplains: Modeling Performance for Various Building Layouts
Publication date :
2024
Journal title :
Water Resources Research
ISSN :
0043-1397
eISSN :
1944-7973
Publisher :
Wiley, Hoboken, United States - New Jersey
Peer reviewed :
Peer Reviewed verified by ORBi
Development Goals :
11. Sustainable cities and communities
Available on ORBi :
since 05 May 2024

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