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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

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

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  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

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