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Simulating the impact of alternative solutions
for marina inlet sedimentation
and coastal erosion
Thijs Lanckriet, Leen Ba...
15 November 2018/ Blankenberge – Wenduine / slide 2
Project overview
• Blankenberge (Belgium):
inlet sedimentation
• Wendu...
15 November 2018/ Blankenberge – Wenduine / slide 3
Blankenberge marina access channel
15 November 2018/ Blankenberge – Wenduine / slide 4
Blankenberge marina access channel
www.nieuwsblad.be/cnt/dmf20130130_0...
15 November 2018/ Blankenberge – Wenduine / slide 5
Wenduine nourishments
First major nourishment in 2012 (720 000 m3)
Mai...
15 November 2018/ Blankenberge – Wenduine / slide 6
Study process
1. Feasiblity study / study of alternatives.
• Criteria:...
15 November 2018/ Blankenberge – Wenduine / slide 7
XBeach models
2 grids:
• Blankenberge model
• Wenduine model
2 simulat...
15 November 2018/ Blankenberge – Wenduine / slide 8
Long-term morphological simulations
• Reduced wave climate
using OPTI
...
15 November 2018/ Blankenberge – Wenduine / slide 9
Hydrodynamics
Impact of groyne field during flood + waves from NNE
15 November 2018/ Blankenberge – Wenduine / slide 10
Hydrodynamics
Reference during flood + waves from WNW
15 November 2018/ Blankenberge – Wenduine / slide 11
Hydrodynamics
Impact of groyne field during flood + waves from WNW
15 November 2018/ Blankenberge – Wenduine / slide 12
Morphodynamics
Impact of groyne field
15 November 2018/ Blankenberge – Wenduine / slide 13
Morphodynamics
How to implement groynes in XBeach?
• Traditional way:...
15 November 2018/ Blankenberge – Wenduine / slide 14
Morphodynamics
How to implement groynes in XBeach?
Effect of model re...
15 November 2018/ Blankenberge – Wenduine / slide 15
Morphodynamics
Optimizing groyne length using XBeach
15 November 2018/ Blankenberge – Wenduine / slide 16
Morphodynamics
Foreshore nourishments
Very little onshore transport p...
15 November 2018/ Blankenberge – Wenduine / slide 17
Conclusions
• A feasibility & (pre-)design study was performed to dev...
15 November 2018/ Blankenberge – Wenduine / slide 18
Questions and philosophical remarks
• How to implement groynes?
• Lit...
15 November 2018/ Blankenberge – Wenduine / slide 19
Morphology – new equilibrium coastline
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DSD-INT 2018 Simulating the impact of alternative solutions for marina inlet sedimentation and coastal erosion - Lanckriet

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Presentation byThijs Lanckriet, IMDC, Belgium, at the XBeach User Day 2018, during Delft Software Days - Edition 2018. Thursday, 15 November 2018, Delft.

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DSD-INT 2018 Simulating the impact of alternative solutions for marina inlet sedimentation and coastal erosion - Lanckriet

  1. 1. Simulating the impact of alternative solutions for marina inlet sedimentation and coastal erosion Thijs Lanckriet, Leen Baelus, Li Wang, Eleftheria Kragiopoulou, Tim Franken & Annelies Bolle XBeach User Day – 2018-11-15
  2. 2. 15 November 2018/ Blankenberge – Wenduine / slide 2 Project overview • Blankenberge (Belgium): inlet sedimentation • Wenduine: Beach erosion Wenduine Blanken- berge
  3. 3. 15 November 2018/ Blankenberge – Wenduine / slide 3 Blankenberge marina access channel
  4. 4. 15 November 2018/ Blankenberge – Wenduine / slide 4 Blankenberge marina access channel www.nieuwsblad.be/cnt/dmf20130130_00451426
  5. 5. 15 November 2018/ Blankenberge – Wenduine / slide 5 Wenduine nourishments First major nourishment in 2012 (720 000 m3) Maintenance nourishments in 2014, 2016 and 2017 (160 000 – 300 000 m3)
  6. 6. 15 November 2018/ Blankenberge – Wenduine / slide 6 Study process 1. Feasiblity study / study of alternatives. • Criteria: • Morphology (effectiveness in reducing sedimentation/erosion) • Cost effectiveness • Nautical access • Swimmer safety • Coastal safety • Environmental aspects • Architectural/planological aspects 2. Pre-design • Activities involving XBeach • Optimization of measures • Coastal safety assessment 3. Final design 4. EIA 5. Construction ---> XBeach ---> XBeach ---> XBeach ---> XBeach ---> XBeach ---> XBeach
  7. 7. 15 November 2018/ Blankenberge – Wenduine / slide 7 XBeach models 2 grids: • Blankenberge model • Wenduine model 2 simulation types: • Long term morphodynamics (1-5 years) • Hydrodynamics (50 hours)
  8. 8. 15 November 2018/ Blankenberge – Wenduine / slide 8 Long-term morphological simulations • Reduced wave climate using OPTI input reduction method • Using 8 tidal cycles of 24h50 min to represent 1 year • Morfac 36.5
  9. 9. 15 November 2018/ Blankenberge – Wenduine / slide 9 Hydrodynamics Impact of groyne field during flood + waves from NNE
  10. 10. 15 November 2018/ Blankenberge – Wenduine / slide 10 Hydrodynamics Reference during flood + waves from WNW
  11. 11. 15 November 2018/ Blankenberge – Wenduine / slide 11 Hydrodynamics Impact of groyne field during flood + waves from WNW
  12. 12. 15 November 2018/ Blankenberge – Wenduine / slide 12 Morphodynamics Impact of groyne field
  13. 13. 15 November 2018/ Blankenberge – Wenduine / slide 13 Morphodynamics How to implement groynes in XBeach? • Traditional way: simply raise 1 grid line in bathymetry • For coarse alongshore grids: groyne slope is not well represented • Which fraction of littoral transport should a groyne block? Groynes have sediment transport going • Around the groyne (bypassing) • Over the groyne  very little guidance in literature
  14. 14. 15 November 2018/ Blankenberge – Wenduine / slide 14 Morphodynamics How to implement groynes in XBeach? Effect of model resolution is rather limited.
  15. 15. 15 November 2018/ Blankenberge – Wenduine / slide 15 Morphodynamics Optimizing groyne length using XBeach
  16. 16. 15 November 2018/ Blankenberge – Wenduine / slide 16 Morphodynamics Foreshore nourishments Very little onshore transport predicted by XBeach => Can we use XBeach to assess effectiveness of foreshore nourishments?
  17. 17. 15 November 2018/ Blankenberge – Wenduine / slide 17 Conclusions • A feasibility & (pre-)design study was performed to develop solutions for marina inlet sedimentation in Blankenberge and beach erosion in Wenduine, Belgium • XBeach was used extensively throughout the study to assess morphology, swimmer safety and nautical access • Innovative applications: • Web-based visualization of currents for swimmers & lifeguards • Optimization of groynes & groyne length • Long-term morphology (5 years)
  18. 18. 15 November 2018/ Blankenberge – Wenduine / slide 18 Questions and philosophical remarks • How to implement groynes? • Little quantitative data available on groyne effects • Long-term morphological modelling using XBeach • Pros & cons vs Delft3D? • Groynes? Why not soft solutions using sand? • Both groynes & soft solutions were simulated and assessed • A detailed cost-benefit analysis showed groynes to be most cost-effective solution (!) • More details at ICE Coastal Management 2019
  19. 19. 15 November 2018/ Blankenberge – Wenduine / slide 19 Morphology – new equilibrium coastline

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