Wallingford - May 2002 Flood propagation - UCL experiments 1 Flood propagation Dam-break flow experiments in idealised representation of complex topography and urban area Université catholique de Louvain Sandra Soares Frazão, Nicolas le Grelle and Yves Zech

Wallingford - May 2002 Flood propagation - UCL experiments 2 Overview Work plan within Flood propagation themeWork plan within Flood propagation theme Numerical modelling Idealised dam-break flow experiments –In complex topographies –In urban area Perspectives

Wallingford - May 2002 Flood propagation - UCL experiments 3 Work plan Experiments in idealised situations –Complex topographies –Urban area Numerical modelling –Benchmarks –Case studies

Wallingford - May 2002 Flood propagation - UCL experiments 4 Overview Work plan within Flood propagation theme Numerical modellingNumerical modelling Idealised dam-break flow experiments –In complex topographies –In urban area Perspectives

Wallingford - May 2002 Flood propagation - UCL experiments 5 Numerical modelling Finite-volume formulation of the shallow-water equations Evaluation of fluxes by Roe scheme

Wallingford - May 2002 Flood propagation - UCL experiments 6 Overview Work plan within Flood propagation theme Numerical modelling Idealised dam-break flow experimentsIdealised dam-break flow experiments –In complex topographies –In urban area Perspectives

Wallingford - May 2002 Flood propagation - UCL experiments 7 Dam-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

Wallingford - May 2002 Flood propagation - UCL experiments 8 The 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 ?

Wallingford - May 2002 Flood propagation - UCL experiments 9 Experimental set-up Reservoir h 0 = 0.75 m Gate Downstream h = 0.15 m The bump test case LRH Châtelet

Wallingford - May 2002 Flood propagation - UCL experiments 10 The bump test case LRH Châtelet

Wallingford - May 2002 Flood propagation - UCL experiments 11 Numerical result The bump test case x (m) z (m)

Wallingford - May 2002 Flood propagation - UCL experiments 12 Comparison with UCL measurements The bump test case z (m) x (m)

Wallingford - May 2002 Flood propagation - UCL experiments 13 Secondary dam UCL

Wallingford - May 2002 Flood propagation - UCL experiments 14 Overview Work plan within Flood propagation theme Numerical modelling Idealised dam-break flow experimentsIdealised dam-break flow experiments –In complex topographies –In urban area Perspectives

Wallingford - May 2002 Flood propagation - UCL experiments 15 Dam-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

Wallingford - May 2002 Flood propagation - UCL experiments 16 The building test case Configuration 1

Wallingford - May 2002 Flood propagation - UCL experiments 17 The building test case Configuration 2

Wallingford - May 2002 Flood propagation - UCL experiments 18 The building test case Preliminary experiments : configuration 1

Wallingford - May 2002 Flood propagation - UCL experiments 19 The building test case Preliminary experiments : configuration 1

Wallingford - May 2002 Flood propagation - UCL experiments 20 The building test case Preliminary experiments : configuration 1

Wallingford - May 2002 Flood propagation - UCL experiments 21 The building test case Preliminary experiments : configuration 1

Wallingford - May 2002 Flood propagation - UCL experiments 22 The building test case Preliminary experiments : configuration 1

Wallingford - May 2002 Flood propagation - UCL experiments 23 The building test case Foreseen measurements –Water-level –Surface-velocity by digital imaging –Pressure forces against building

Wallingford - May 2002 Flood propagation - UCL experiments 24 The building test case Configuration 1 - Numerical simulation

Wallingford - May 2002 Flood propagation - UCL experiments 25 The building test case Configuration 1 - Numerical simulation

Wallingford - May 2002 Flood propagation - UCL experiments 26 The building test case Configuration 1 - Numerical simulation

Wallingford - May 2002 Flood propagation - UCL experiments 27 The building test case Configuration 2 - Numerical simulation

Wallingford - May 2002 Flood propagation - UCL experiments 28 The building test case Configuration 2 - Numerical simulation

Wallingford - May 2002 Flood propagation - UCL experiments 29 The building test case Configuration 2 - Numerical simulation

Wallingford - May 2002 Flood propagation - UCL experiments 30 Overview Work plan within Flood propagation theme Numerical modelling Idealised dam-break flow experiments –In complex topographies –In urban area PerspectivesPerspectives

Wallingford - May 2002 Flood propagation - UCL experiments 31 Perspectives Adverse slopes and local sills –New experiments –Improve source term treatment Urban obstacles –Experiments with various configurations –Local influence –Influence on the far field