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DSD-INT 2019 AeoLiS - towards an engineering tool for aeolian sediment transport and dune modelling - van Westen

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Presentation by Bart van Westen, Deltares, at the Delft3D and XBeach User Day: Coastal morphodynamics, during Delft Software Days - Edition 2019. Wednesday, 13 November 2019, Delft.

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DSD-INT 2019 AeoLiS - towards an engineering tool for aeolian sediment transport and dune modelling - van Westen

  1. 1. D e l t a r e s - A e o L i S : t o w a r d s a n e n g i n e e r i n g t o o l Towards an engineering tool for aeolian sediment transport and dune modelling Bart van Westen AeoLiS
  2. 2. Deltares-AeoLiS:towardsanengineeringtool 2 Engineering/management problems in the aeolian zone Consequences of dynamic coastal management Nuisance of wind-blown sand Dune recovery after storm impact Subaerial behaviour of mega-nourishments
  3. 3. Deltares-AeoLiS:towardsanengineeringtool 3 Engineering/management problems in the aeolian zone • Sea Level Rise • New coastal management strategies • Predicitive tool applicable for coastal engineering and management: AeoLiS (Hoonhout & de Vries, 2016) • Process-based model • Aeolian sediment transport • Supply-limited transport approach: • Multi-fraction sediment transport • Hydrodynamics on velocity threshold
  4. 4. Deltares-AeoLiS:towardsanengineeringtool 4 Engineering/management problems in the aeolian zone AeoLiS (Hoonhout & de Vries, 2016) • Process-based model • Aeolian sediment transport • Supply-limited transport approach: • Multi-faction sediment transport • Hydrodynamics on velocity threshold Coastal Dune Model (Durán & Moore, 2013) • Saltation model • Shear stress perturbations • Flow separation • Avalanching • Vegetation: o Local growth DUBEVEG (de Groot, 2011) • Vegetation: o Seed germination o Lateral propagation New • Hydrodynamic influence on: o Morphology o Vegetation Recent Implementations
  5. 5. Model Description Deltares-AeoLiS:towardsanengineeringtool 5 1. Multi-faction aeolian transport Δρveg ΔZb Δu* Δu* 2. Bed level changes 3. Wind-field perturbations 4. Vegetation growth 5. Vegetation as roughness element 6. Hydrodynamic influence on: • Bed level (avalanching) • Vegetation
  6. 6. Academic model results Deltares-AeoLiS:towardsanengineeringtool 6 3D View Top View 100 m Barchan dune Parabolic dune
  7. 7. Towards an engineering tool Deltares-AeoLiS:towardsanengineeringtool 7 Reproduce typical behavior in academic problems Tool for engineering and management problems
  8. 8. Engineering and management applications Deltares-AeoLiS:towardsanengineeringtool 8Consequences of dynamic coastal management Nuisance of wind-blown sand Dune recovery after storm impact Subaerial behaviour of mega-nourishments
  9. 9. Quantifying consequences of dynamic coastal management • Testing the newest implementations of AeoLiS • Prove (potential) tool for coastal management Deltares-AeoLiS:towardsanengineeringtool 9 • Area near Sint Maartenszee • Simulation period of 1 year • Containing dynamic features • Blowouts • Embryo dunes Simulation
  10. 10. Quantifying consequences of dynamic coastal management Deltares-AeoLiS:towardsanengineeringtool 10
  11. 11. Quantifying consequences of dynamic coastal management Deltares-AeoLiS:towardsanengineeringtool 11ObservedAeoLiS
  12. 12. Engineering and management applications Deltares-AeoLiS:towardsanengineeringtool 12Consequences of dynamic coastal management Nuisance of wind-blown sand Dune recovery after storm impact Subaerial behaviour of mega-nourishments
  13. 13. Coupled modelling of mega-nourishments • Numerical modelling of the Sand Motor • Shown results: development to 2016 Deltares-AeoLiS:towardsanengineeringtool 13 • AeoLiS (Hoonhout, 2017) • Delft3D (Luijendijk, 2017) Observed
  14. 14. Coupled modelling of mega-nourishments • Numerical modelling of the Sand Motor (results until 2016) • Coupled model (Luijendijk, 2019) Deltares-AeoLiS:towardsanengineeringtool 14
  15. 15. Coupled modelling of mega-nourishments • Numerical modelling of the Sand Motor • Shown results: development to 2016 Deltares-AeoLiS:towardsanengineeringtool 15 • Coupled modelling (Luijendijk, 2019) Observed
  16. 16. Deltares-AeoLiS:towardsanengineeringtool 16 Development of AeoLiS Sierd de Vries TU Delft Assistant professor Caroline Hallin TU Delft Postdoc Nick Cohn ERDC Bart van Westen Deltares + MSc-students PhD-students and others! Release party? 2019 2020 2021 Delft Software Days (DSD-INT 2019) Solving existing model problems Development towards engineering applicationImplementation dune processes

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