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27-6-2016
Challenge the future
Delft University of Technology
Zoetwaterpluim in de Rijn-Maasmond
(3D hydrodynamica)
Pilot applicatie
Arjen Luijendijk
Niek Waagmeester
Freek Scheel
Saulo Meirelles
2
Sand Motor (ZM) at the Dutch coast
Area of interest: Sand Motor Mega-nourishment of 21 mln m3
Scale of intervention:
• 2 km alongshore • 1 km cross-shore
Large signal-to-noise ratio
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Aerial photograph 3D view of measured bed levels
Sand Motor – Morphological evolution
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Motivation – Field campaign MegaPEX Multi-disciplinary field measurements for 6 weeks – Sept14
Goal: Operational hydrodynamic predictions for field measurements
Dye experiment
Drifters
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Coastal processes around the ZM
Hydrodynamics
• Tidal currents
• Wind- and wave driven
• Fresh river outflow
Waves
• From SW and NW
Sediments
• Sandy shores
• Cohesive sediments from river
Rotterdam
Delft
World Forum
Curvilinear - Zeedelta model
No 3D operational model available covering both river mouth and ZM
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Boundary conditions • Tidal conditions • Fresh river discharges • Wind Resolution • Deeper water: ~300 m • Sand engine: ~17 m
Numerics • ~110,000 nodes • 20 layers • Requires 4hrs to run 1day on 8 processors 2.6GHz
Computational
mesh
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Overlaying various data sources
• AHN
• Aerial images
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Overlaying various data sources
• AHN
• Aerial images
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Overlaying various data sources
• Lidar (kusthoogte)
• AHN
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D-HYDRO Suite
Benefits using Flexible Mesh compared to Curvilinear
• Optimal resolution where needed
• Optimisation of #grid cells (~50% of curvi grid)
• Variable time step
• Parallelization (8 is semi-optimal for this simulation)
• BMI compliant – communication with other software
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Model results – Surface salinities
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Validation
• Quantitatively temporal
• In-situ at Hoek van Holland
• Fixed, continuous measurements
• In—situ: 13-hr measurements at the Zandmotor
• Profiles from a ship
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Validation – currents and salinities
Figure 1: Measured and modelled salinity at observation station Hoek van Holland. Coloured dots indicate measurements every 10 minutes at 2.5, 4.5 and 9 m depth. Coloured lines indicate model results of the 5 sigma layers. Measurements have the same colour as the closest model layer.
Velocities at Zandmotor
Salinities at 3 locations in water column (HvH)
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But how do you validate spatial
behaviour?
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Validation
• Quantitatively temporal
• In-situ at Hoek van Holland
• Fixed, continuous measurements
• In—situ: 13-hr measurements at the Zandmotor
• Profiles from a ship
• Spatial behaviour? Qualitatively by Remote Sensing:
• X-Band radar (24/7)
• Sentinel 2 images (optical; every 10 days)
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Remote Sensing X-Band radar images every 5 min
• Model validation - fronts
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Remote Sensing Satellite image of 25 Jan 2016 11:03
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Observed at 25 Jan 2016 11:03
Computed at 25 Jan 2016 12:00
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In-situ measurements
17 Oct 2014 7:50
17 Oct 2014 13:50
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Alongshore Cross-shore
Obs
Comp
Velocities
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Findings
• Flexible Mesh opens new possibilities
• Tendency to include larger scale domains
• Need for qualitative comparisons with RS
• Future outlook:
• FM can be relatively easy coupled to other programs.
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Work in progress
• Spatial coupling of FM Morphology with aeolian transport model
• Temporal de- / activation of processes
Long waves
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Vragen?