mo-i-rana - september 2002 dam-break floods and sediment movement 1 impact - wp4 dam-break induced...
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Mo-i-Rana - September 2002
Dam-break floods and sediment movement
1
IMPACT - WP4IMPACT - WP4
Dam-break inducedDam-break induced floodsfloodsand sediment movementand sediment movement
Benchmark BM UCL 1
Université catholique de Louvain
Benoit Spinewine and Yves Zech
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
2
Benchmark BM UCL 1Benchmark BM UCL 1
• 1D dam-break flow in the near field– Uniform material– Same bed levels
National Taiwan University
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
3
Physical descriptionPhysical description
• t = 0.0 s
• t = 0.2 s
• t = 0.4 s
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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Physical descriptionPhysical description
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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Physical descriptionPhysical description
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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Analytical descriptionAnalytical description
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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ExperimentsExperiments
• Material– Uniform cylindrical PVC pellets– D = 3.2 mm - H = 2.8 mm– Equivalent spherical D = 3.5 mm– Density = 1540 kg/m³– Static granular packing
0.60
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
8L = 0.10 m
ExperimentsExperiments
• Initial conditions– h0 = 0.10 m; hs 0.05 m
– Downstream sediments saturated
h0
hs
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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MeasurementsMeasurements
• Layer boundaries
Visual observation
Velocity gradient
Automated detection
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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MeasurementsMeasurements
• Velocity: particle tracking (200 fps)• Tracking of tracers particles• Bed material tracking
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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xb (t) xf (t)
Expected resultsExpected results
• Wave propagation– Front wave xf (t)– Back wave xb (t)– t = 0.05 s
0.10 s ... 2.00 s
t = 0.05 s
x
t
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
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Expected resultsExpected results
• Interface levels– zb (t)
zs (t)zw (t)
– x = - 0.50 m - 0.25 m 0.00 m 0.25 m 0.50 m 0.75 m
zw
zs zb
z
x
Mo-i-Rana - September 2002
Dam-break floods and sediment movement
13
IMPACT - WP4IMPACT - WP4
Dam-break inducedDam-break induced floodsfloodsand sediment movementand sediment movement
Benchmark BM UCL 1
Université catholique de Louvain
Benoit Spinewine and Yves Zech
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