1 / 20

Workshop Quest4D May 14 2009 LTV-slib: Modelling of mud dynamics

Workshop Quest4D May 14 2009 LTV-slib: Modelling of mud dynamics. Joris Vanlede (WL) Thijs van Kessel (Deltares) Marieke Eleveld (IVM) Daphne van der Wal (NIOO). Managerial Questions. LTV slib (Long Term Vision – Mud transport) Effects of maintenance dredging

hastin
Télécharger la présentation

Workshop Quest4D May 14 2009 LTV-slib: Modelling of mud dynamics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Workshop Quest4DMay 14 2009LTV-slib: Modelling of mud dynamics Joris Vanlede (WL) Thijs van Kessel (Deltares) Marieke Eleveld (IVM) Daphne van der Wal (NIOO)

  2. Managerial Questions LTV slib (Long Term Vision – Mud transport) • Effects of maintenance dredging • Harbour maintenance: mostly mud • Maintenance dredging of fairway and sills: mostly sand • Effects of capital dredging • Harbour extension (e.g. Deurgancdok) • Fairway deepening and widening • … • Effects on mud dynamics • Turbidity • Siltation rates • Sediment composition of tidal mud flats • Mud balance • …

  3. Model vs. Measurements • Measurements: • Knowledge of present condition • System knowledge • Process-based model: • Based on a physical description of processes (e.g. 3D mixing) • Quantify effects (e.g. fairway deepening, sea level rise,…) • Model output available “always” and “everywhere”(<-> monitoring)

  4. Past activities • 2006: • Literature survey • Data-analysis • Calculation of 14 days • 2007: • Model improvements • Calculation of 3 months • 2008: • Improvements in 3D hydrodynamics • Calculation of 1 year (seasonal dynamics) • Model application : 2nd fairway deepening

  5. Hydrodynamics • Year 2006 • BC from ZUNO 2006 model • Resolution • WS: 100m • Upstream: 30m • 1 million cells in 5 layers • 27 days CPU time for 1 yr. (x13) • 2 TB of HD results

  6. Hydrodynamics: conclusions • Calculation of 1 year of 3D hydrodynamics with measurements as boundary conditions. • Seasonal influence is modeled explicitly. • Most important difference model - measurement is M4 phase in boundary condition (action 2009).

  7. Remote sensing data • SPM in upper part water column (IVM) • Silt content of mud flats (NIOO)

  8. IVM: SPM in de waterkolom

  9. NIOO: Mud content mud flats • Mud content from radar images (SAR) • Seasonal variation in mud content

  10. Seasonal dynamics • Seasonal dynamics is present, but not sufficiently • Seasonal variation of settling velocity ws or erosion parameter crit • Boundary conditions are already seasonally variable

  11. Import/export at Vlissingen Gross kton/day Net • Model: Net export of 2 MT/yr • Van Alphen (1990): 0.6 MT/yr net import • Van Maldegem & Vroom (1995): 0.1 +/- 0.2 MT/yr net import • Gross export of 37 MT/yr • Gross import of 35 MT/yr

  12. Validation at Antwerp Boei 84 Boerenschans

  13. Validation at Antwerp (2) Peak missing Bottom concentration too low

  14. ETM: Estuarine Turbidity Maximum Neap tide Spring tide

  15. Validation Remote Sensing Data

  16. Validation Remote Sensing Data

  17. Application: 2nd fairway deepening 1997 – 1998 7.5 m³ capital dredging works Deepening of naturally occuring sills

  18. Application: 2nd fairway deepening

  19. Conclusions • Mud transport model is operational and is compared to measurements (in-situ & remote sensing) • Points of attention: • Seasonal dynamics • Estuarine circulation • M4 phase • 2nd fairway deepening had little effect on SPM concentrations

  20. Plans 2009 • Further application of the model • Effect opening of DGD on SPM and siltation rates around Antwerp. • Effect of dumping of dredged material around Terneuzen harbor • Development of a Zeebrugge detail model • Inter-comparison between mud transport models of BMM and WL • Analysis of effects 2nd fairway deepening on siltation in harbors

More Related