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Flood propagationFlood propagationDam-break flow experiments in idealised Dam-break flow experiments in idealised
representation of complex topography and representation of complex topography and urban areaurban area
Université catholique de Louvain
Sandra Soares Frazão, Nicolas le Grelle and Yves Zech
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OverviewOverview
• Work plan within “Flood propagation” Work plan within “Flood propagation” themetheme
• Numerical modelling• Idealised dam-break flow experiments
– In complex topographies– In urban area
• Perspectives
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Work plan
• Experiments in idealised situations– Complex topographies – Urban area
• Numerical modelling– Benchmarks– Case studies
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OverviewOverview
• Work plan within “Flood propagation” theme
• Numerical modellingNumerical modelling• Idealised dam-break flow experiments
– In complex topographies– In urban area
• Perspectives
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Numerical modellingNumerical modelling
• Finite-volume formulation of the shallow-water equations
• Evaluation of fluxes by Roe scheme
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OverviewOverview
• Work plan within “Flood propagation” theme
• Numerical modelling• Idealised dam-break flow experimentsIdealised dam-break flow experiments
– In complex topographiesIn complex topographies– In urban area
• Perspectives
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Dam-break flow experimentsDam-break flow experiments
• Complex topographies– Dams built in mountainous areas
• steep, dry slopes• abrupt banks
– Arrival in large plains• great extent of small water depth
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The bump test caseThe bump test case
• CADAM test case by ULB/LRH Châtelet, March 1998
• Additional laboratory measurements at UCL using digital imaging, March 2001
• More experiments for IMPACT ?
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• Experimental set-up
Reservoirh0 = 0.75 m
Gate
Downstreamh = 0.15 m
The bump test caseThe bump test case
LRHChâtelet
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The bump test caseThe bump test case
LRHChâtelet
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• Numerical result
The bump test caseThe bump test case
x (m)
z (m)
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• Comparison with UCL measurements
The bump test caseThe bump test case
z (m)
x (m)
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Secondary damSecondary dam
UCL
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OverviewOverview
• Work plan within “Flood propagation” theme
• Numerical modelling• Idealised dam-break flow experimentsIdealised dam-break flow experiments
– In complex topographies– In urban areaIn urban area
• Perspectives
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Dam-break flow experimentsDam-break flow experiments
• Urban areas– Kind of complex topography
• Streets, buildings, houses• Complex flow route
– Dam-break wave impact against buildings
– Important velocities• Worsened rescue conditions
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The building test caseThe building test case
• Configuration 1
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The building test caseThe building test case
• Configuration 2
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The building test caseThe building test case
• Preliminary experiments : configuration 1
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The building test caseThe building test case
• Preliminary experiments : configuration 1
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The building test caseThe building test case
• Preliminary experiments : configuration 1
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The building test caseThe building test case
• Preliminary experiments : configuration 1
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The building test caseThe building test case
• Preliminary experiments : configuration 1
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The building test caseThe building test case
• Foreseen measurements– Water-level– Surface-velocity by digital imaging– Pressure forces against building
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The building test caseThe building test case
• Configuration 1 - Numerical simulation
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The building test caseThe building test case
• Configuration 1 - Numerical simulation
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The building test caseThe building test case
• Configuration 1 - Numerical simulation
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The building test caseThe building test case
• Configuration 2 - Numerical simulation
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The building test caseThe building test case
• Configuration 2 - Numerical simulation
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The building test caseThe building test case
• Configuration 2 - Numerical simulation
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OverviewOverview
• Work plan within “Flood propagation” theme
• Numerical modelling• Idealised dam-break flow experiments
– In complex topographies– In urban area
• PerspectivesPerspectives
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PerspectivesPerspectives
• Adverse slopes and local sills– New experiments– Improve source term treatment
• Urban obstacles– Experiments with various
configurations– Local influence– Influence on the far field