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DSD-INT 2019 Effects installation Borssele export cables - Koudstaal

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Presentation by Kimberley Koudstaal, WaterProof Marine Consultancy & Services B.V., The Netherlands, 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 Effects installation Borssele export cables - Koudstaal

  1. 1. Kimberley Koudstaal 13-11-2019 Effects installation Borssele export cables
  2. 2. Introduction Location of the Borssele export cables
  3. 3. Introduction Location of the Borssele export cables
  4. 4. Research questions 1) Will the installation of the export cables affect sediment transport and local morphological development of the study area? 2) How and to what extent will the installation affect the maintenance dredging requirements of the navigation channel towards Antwerp?
  5. 5. Approach Morphological assessments for Borssele cables 1) Study morphodynamic evolution of the Western Scheldt Estuary 2) Setup & calibrate numerical morphological model of the Scheldt Estuary 3) Model effects of the installation of the export cables
  6. 6. Approach Morphological assessments for Borssele cables 1) Study morphodynamic evolution of the Western Scheldt Estuary 2) Setup & calibrate numerical morphological model of the Scheldt Estuary 3) Model effects of the installation of the export cables
  7. 7. Morphodynamic characterization
  8. 8. Morphodynamic characterization
  9. 9. Vlakte van der Raan Morphodynamic characterization
  10. 10. Spijkerplaat area Morphodynamic characterization [m]
  11. 11. Spijkerplaat area Morphodynamic characterization [m]
  12. 12. Morphodynamic characterization
  13. 13. Morphodynamic characterization
  14. 14. Morphodynamic characterization
  15. 15. Morphodynamic characterization
  16. 16. Morphodynamic characterization
  17. 17. Morphodynamic characterization
  18. 18. Morphodynamic characterization
  19. 19. Morphodynamic characterization
  20. 20. Morphodynamic characterization
  21. 21. Morphodynamic characterization
  22. 22. Morphodynamic characterization
  23. 23. Morphodynamic characterization SouthNorth
  24. 24. Morphodynamic characterization
  25. 25. Approach Morphological assessments for Borssele cables 1) Study morphodynamic evolution of the Western Scheldt Estuary 2) Setup & calibrate numerical morphological model of the Scheldt Estuary 3) Model effects of the installation of the export cables
  26. 26. Delft3D model Scheldt Estuary Mesh of the used overall Scheldt model
  27. 27. Delft3D model Western Scheldt Estuary Mesh of the applied detailed model
  28. 28. Model validation Comparison of simulated water levels and harmonically analysed measured waterlevels
  29. 29. Model validation Cross-sections discharge measurements 2017
  30. 30. Model validation
  31. 31. Model validation
  32. 32. Model results; morphodynamic Parameter Value Timestep 3 seconds (Courant number 7-8 in Navigation channel and approx. 1 in shallow areas) 2D/3D 2DH model Simulation period Neap-spring cycle + spinup period (15 days total in summer 2018) Sediment fractions 150, 200, 250 µm distinguished in a fraction where sediment is dumped and a base layer Model bed level 2015 & 2017 Roughness formulation Spatial variation of Manning values (0.02 at North-Sea up to 0.027 in Western Scheldt Horizontal eddy viscosity 1.0 Horizontal eddy diffusivity 1.0 Sediment transport formulation Van Rijn (1993) Morphological factor 13, to simulate a period of approx. 185 days (half year) Waves Average wave conditions Hs = 1.0 m, Tp = 5.7 sec, Dir = 250 degrees
  33. 33. Model results; morphodynamic Parameter Value Timestep 3 seconds (Courant number 7-8 in Navigation channel and approx. 1 in shallow areas) 2D/3D 2DH model Simulation period Neap-spring cycle + spinup period (15 days total in summer 2018) Sediment fractions 150, 200, 250 µm distinguished in a fraction where sediment is dumped and a base layer Model bed level 2015 & 2017 Roughness formulation Spatial variation of Manning values (0.02 at North-Sea up to 0.027 in Western Scheldt Horizontal eddy viscosity 1.0 Horizontal eddy diffusivity 1.0 Sediment transport formulation Van Rijn (1993) Morphological factor 13, to simulate a period of approx. 185 days (half year) Waves Average wave conditions Hs = 1.0 m, Tp = 5.7 sec, Dir = 250 degrees
  34. 34. Model results; morphodynamic Parameter Value Timestep 3 seconds (Courant number 7-8 in Navigation channel and approx. 1 in shallow areas) 2D/3D 2DH model Simulation period Neap-spring cycle + spinup period (15 days total in summer 2018) Sediment fractions 150, 200, 250 µm distinguished in a fraction where sediment is dumped and a base layer Model bed level 2015 & 2017 Roughness formulation Spatial variation of Manning values (0.02 at North-Sea up to 0.027 in Western Scheldt Horizontal eddy viscosity 1.0 Horizontal eddy diffusivity 1.0 Sediment transport formulation Van Rijn (1993) Morphological factor 13, to simulate a period of approx. 185 days (half year) Waves Average wave conditions Hs = 1.0 m, Tp = 5.7 sec, Dir = 250 degrees
  35. 35. Model results; morphodynamic Parameter Value Timestep 3 seconds (Courant number 7-8 in Navigation channel and approx. 1 in shallow areas) 2D/3D 2DH model Simulation period Neap-spring cycle + spinup period (15 days total in summer 2018) Sediment fractions 150, 200, 250 µm distinguished in a fraction where sediment is dumped and a base layer Model bed level 2015 & 2017 Roughness formulation Spatial variation of Manning values (0.02 at North-Sea up to 0.027 in Western Scheldt Horizontal eddy viscosity 1.0 Horizontal eddy diffusivity 1.0 Sediment transport formulation Van Rijn (1993) Morphological factor 13, to simulate a period of approx. 185 days (half year) Waves Average wave conditions Hs = 1.0 m, Tp = 5.7 sec, Dir = 250 degrees
  36. 36. Model results; morphodynamic Parameter Value Timestep 3 seconds (Courant number 7-8 in Navigation channel and approx. 1 in shallow areas) 2D/3D 2DH model Simulation period Neap-spring cycle + spinup period (15 days total in summer 2018) Sediment fractions 150, 200, 250 µm distinguished in a fraction where sediment is dumped and a base layer Model bed level 2015 & 2017 Roughness formulation Spatial variation of Manning values (0.02 at North-Sea up to 0.027 in Western Scheldt Horizontal eddy viscosity 1.0 Horizontal eddy diffusivity 1.0 Sediment transport formulation Van Rijn (1993) Morphological factor 13, to simulate a period of approx. 185 days (half year) Waves Average wave conditions Hs = 1.0 m, Tp = 5.7 sec, Dir = 250 degrees
  37. 37. Model results; morphodynamic Parameter Value Timestep 3 seconds (Courant number 7-8 in Navigation channel and approx. 1 in shallow areas) 2D/3D 2DH model Simulation period Neap-spring cycle + spinup period (15 days total in summer 2018) Sediment fractions 150, 200, 250 µm distinguished in a fraction where sediment is dumped and a base layer Model bed level 2015 & 2017 Roughness formulation Spatial variation of Manning values (0.02 at North-Sea up to 0.027 in Western Scheldt Horizontal eddy viscosity 1.0 Horizontal eddy diffusivity 1.0 Sediment transport formulation Van Rijn (1993) Morphological factor 13, to simulate a period of approx. 185 days (half year) Waves Average wave conditions Hs = 1.0 m, Tp = 5.7 sec, Dir = 250 degrees
  38. 38. Alpha + Beta cables Model results; morphodynamic
  39. 39. Alpha + Beta cables Model results; morphodynamic
  40. 40. Model results; morphodynamic
  41. 41. Model results; morphodynamic Verification of model with actual dredging volumes
  42. 42. Model results; morphodynamic Verification of model with actual dredging volumes Sill of Borssele (x 1000 m³) Sill of Vlissingen (x1000 m³) Honte (x1000 m³) Total (x 1000 m³) Actual dredged volumes 2017 1290 190 650 2130
  43. 43. Model results; morphodynamic Verification of model with actual dredging volumes Sill of Borssele (x 1000 m³) Sill of Vlissingen (x1000 m³) Honte (x1000 m³) Total (x 1000 m³) Model; 2017, 150 µm 2150 40 30 2220 Actual dredged volumes 2017 1290 190 650 2130
  44. 44. Model results; morphodynamic Verification of model with actual dredging volumes Sill of Borssele (x 1000 m³) Sill of Vlissingen (x1000 m³) Honte (x1000 m³) Total (x 1000 m³) Model; 2017, 150 µm 2150 40 30 2220 Model; 2017, 250 µm 790 590 840 2220 Actual dredged volumes 2017 1290 190 650 2130
  45. 45. Model results; morphodynamic Verification of model with actual dredging volumes Sill of Borssele (x 1000 m³) Sill of Vlissingen (x1000 m³) Honte (x1000 m³) Total (x 1000 m³) Model; 2017, 150 µm 2150 40 30 2220 Model; 2017, 200 µm 1190 270 390 1850 Model; 2017, 250 µm 790 590 840 2220 Actual dredged volumes 2017 1290 190 650 2130
  46. 46. Model results; morphodynamic Verification of model with actual dredging volumes Simulations have been performed for: ▪ Wave related transport ▪ Flow related transport ▪ Slope factor (α-Bn/Bs)
  47. 47. Effect of model settings Model results; morphodynamic
  48. 48. Effect of model settings Model results; morphodynamic
  49. 49. Effect of model settings Model results; morphodynamic
  50. 50. Approach Morphological assessments for Borssele cables 1) Study morphodynamic evolution of the Western Scheldt Estuary 2) Setup & calibrate numerical morphological model of the Scheldt Estuary 3) Model effects of the installation of the export cables
  51. 51. Approach Morphological assessments for Borssele cables 1) Study morphodynamic evolution of the Western Scheldt Estuary 2) Setup & calibrate numerical morphological model of the Scheldt Estuary 3) Model effects of the installation of the export cables a) Effects on local morphology dynamics b) Effects on dredge requirements
  52. 52. Model results, channel model Dredging (blue) and dumping (red) locations for the cables
  53. 53. Model results – Scenario 2 Morphodynamic results after 6 months for the present situation
  54. 54. Model results – Scenario 2 Morphodynamic results after 6 months for the cables
  55. 55. Model results – Scenario 2
  56. 56. Model results – Scenario 2
  57. 57. Morphodynamic characterization
  58. 58. Model results Effect on total volume of sediment at the navigation channel Situation Sedimentation Present situation Sedimentation Present situation + cable Difference in sedimentation (m) Difference in sedimentation (%) 2017 Alpha, 200 µm 4,768,000 4,859,000 91,000 1.9 Beta, 200 µm 4,768,000 4,814,000 46,000 1.0
  59. 59. Model results Maintenance requirement of the navigation channel Simulation Additional volume to be dredged [m³] Alpha Additional volume to be dredged [m³] Beta 2017, 200 um -9.500 (-0.5%) -500 (-nihil%)
  60. 60. Model results Maintenance requirement of the navigation channel • Changes are small and fall within the uncertainty bandwidth of the model Simulation Additional volume to be dredged [m³] Alpha Additional volume to be dredged [m³] Beta 2017, 200 um -9.500 (-0.5%) -500 (-nihil%)
  61. 61. Research questions 1) Will the installation of the export cables affect sediment transport and local morphological development of the study area? 2) How and to what extent will the installation affect the maintenance dredging requirements of the navigation channel towards Antwerp?
  62. 62. Research questions 1) Will the installation of the export cables affect sediment transport and local morphological development of the study area? 2) How and to what extent will the installation affect the maintenance dredging requirements of the navigation channel towards Antwerp? 1) Local effects can be seen, but the large scale morphology remains largely unaffected
  63. 63. Research questions 1) Will the installation of the export cables affect sediment transport and local morphological development of the study area? 2) How and to what extent will the installation affect the maintenance dredging requirements of the navigation channel towards Antwerp? 1) Local effects can be seen, but the large scale morphology remains largely unaffected 2) The effects on the dredging requirements are small and fall within the uncertainty bandwidth of the model

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