09 DSD-NL 2016 - D-HYDRO Symposium - Zoetwaterpluim in de Rijn-Maasmond (3D hydrodynamica) - Arjen Luijendijk, Deltares

1. 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. 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

3. 3
Aerial photograph 3D view of measured bed levels
Sand Motor – Morphological evolution

4. 4
Motivation – Field campaign MegaPEX
Multi-disciplinary field measurements for 6 weeks – Sept14
Goal: Operational hydrodynamic
predictions for field measurements
Dye experiment
Drifters

5. 5
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

6. 6
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

7. 7
Overlaying various data sources
• AHN
• Aerial images

8. 8
Overlaying various data sources
• AHN
• Aerial
images

9. 9
Overlaying various data sources
• Lidar (kusthoogte)
• AHN

10. 10
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

11. 11
Model results – Surface salinities

12. 12
Validation
• Quantitatively temporal
• In-situ at Hoek van Holland
• Fixed, continuous measurements
• In—situ: 13-hr measurements at the Zandmotor
• Profiles from a ship

13. 13
Validation – currents and salinities
Figure 1: Measured and modelled salinity at observation station Hoek van Holland. Coloured dots
measurements every 10 minutes at 2.5, 4.5 and 9 m depth. Coloured lines indicate model results
sigma layers. Measurements have the same colour as the closest model layer.
Velocities at Zandmotor
Salinities at 3 locations in water column (HvH)

14. 14
But how do you validate spatial
behaviour?

15. 15
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)

16. 16
Remote Sensing
X-Band radar images every 5 min
• Model validation - fronts

17. 17
Remote Sensing
Satellite image of 25 Jan 2016 11:03

18. 18
Observed at 25 Jan 2016 11:03Computed at 25 Jan 2016 12:00

19. 19
In-situ measurements
17 Oct 2014 7:50
17 Oct 2014 13:50

20. 20
Alongshore Cross-shore
Obs
Comp
Velocities

21. 21
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.

22. 22
Work in progress
• Spatial coupling of FM Morphology with aeolian transport model
• Temporal de- / activation of processes
Long waves

23. 23
Vragen?