Date post: | 06-Aug-2015 |
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Science |
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Contents
The new Delta Flume for large-scale physical model testing
1. Introduction
2. The existing Delta Flume
3. The new Delta Flume
2
1. Introduction
New Delta Flume part of a system of wave facilities:
L (m) W (m) H (m)
• 2D, small scale: Scheldt Flume 110 1 1.2
• 2D & 3D, small scale: Atlantic Basin 75 8.7 1.3
• 3D, small scale: Delta Basin 50 50 1
• 2D, large scale: Delta Flume 300 5 9.5
3
Delta Basin Delta Flume
Scheldt Flume
Atlantic Basin
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2. The existing Delta Flume
Delta Flume
• 2D, large scale testing: Old: 240m*5m*7m
New: 300m*5m*9.5m
• Wave generators: Old: Hs=1.6m (Hmax= 2.5m);
New: Hs=2.2m (Hmax = 4 - 4.5m).
• Accurate active reflection compensation & 2nd order wave generation.
• (Tidal) water level variations New: Pump capacity: 1 m3/s.
• Video observation system, profiler, laser-scanner, radar, etc.
Delta Flume
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2. The existing Delta Flume
Delta Flume
Low-crested structure with cobble beach
Placed block revetments
Wave run-up and wave overtopping
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2. The existing Delta Flume
Delta Flume
Residual strength of dikes
Breakwater stability Dune erosion
Geotubes
Wave damping by brushwood mattresses
3. The new Delta Flume
Why a new Delta Flume?
• Less or no scale effects (the bigger, the better): Dikes, dunes, etc.
• Large potential savings by performing research.
• Existing Delta Flume over 30 years old.
• Need for new large-scale observation / measurement techniques.
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Delta Flume
3. The new Delta Flume
Scale effects
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• Wave impacts
• surface tension (bubble size),
• air compressibility,
• elasticity of the structure,
• Geotechnics (e.g. liquefaction)
• Fall velocity of sediments
• Flow resistance permeable flow
• Turbulent damping
Vert
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3. The new Delta Flume
The new Delta Flume
• Large scale testing: 300m*5m*9.5m Hs=2.2m (Hmax =4-4.5m).
• (Tidal) water level variations: Pump capacity: 1 m3/s.
• Video observation system, profiler, laser-scanner, radar, etc.
Delta Flume
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3. The new Delta Flume
Cross-sections of the new Delta Flume
• Measurement carriage (green) and crane (yellow) on separate rails
• Storage reservoir for water
• Access to flume
• Construction of models & installation of measurement equipment
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3. The new Delta Flume
Wave generator of the new Delta Flume
• Water defences in The Netherlands: From 59% to 85% on scale 1:1
Old Delta Flume
New Delta Flume
Old Delta Flume
New Delta Flume
Wave generator of the new Delta Flume
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3. The new Delta Flume
Wave board installation
Wave board with ARC-gauges
Hydraulic power units
Impressions of the new Delta Flume
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3. The new Delta Flume
Test hall and crane (yellow) Height of flume: 9.5 m
Crane on rails
Wave damping slope
3. The new Delta Flume
Measurement techniques in the new Delta Flume
• Video techniques (stereo photography, observation cameras)
• Terrestrial laser scanner
• Mechanical profiler
• Wave gauges, velocity meters, pressure transducers
17 Mechanical profiler Stereo photography Velocities & pressures
Wave gauge
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3. The new Delta Flume
Other aspects of the new Delta Flume
• Soft soil underneath flume: 800 foundation piles (9 km in total).
• 22000 m3 concrete.
• 1850 ton reinforcement steel.
• Storage capacity 9.2 million liter water.
Delta Flume
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3. The new Delta Flume
The new Delta Flume
• Large scale modelling.
• Highest human-made waves (new state-of-the-art wave generation).
• State-of-the-art measurement techniques.
• Experienced staff.
Delta Flume