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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)

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Workshop Quest4D –May 14 2009 – WL Borgerhout 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 –…

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Workshop Quest4D –May 14 2009 – WL Borgerhout 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)

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Workshop Quest4D –May 14 2009 – WL Borgerhout 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 : 2 nd fairway deepening

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Workshop Quest4D –May 14 2009 – WL Borgerhout 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

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Workshop Quest4D –May 14 2009 – WL Borgerhout 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).

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Workshop Quest4D –May 14 2009 – WL Borgerhout 7 Remote sensing data SPM in upper part water column (IVM) Silt content of mud flats (NIOO)

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Workshop Quest4D –May 14 2009 – WL Borgerhout 8 IVM: SPM in de waterkolom

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Workshop Quest4D –May 14 2009 – WL Borgerhout 9 NIOO: Mud content mud flats ►Mud content from radar images (SAR) ►Seasonal variation in mud content

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Workshop Quest4D –May 14 2009 – WL Borgerhout 10 Seasonal dynamics Seasonal dynamics is present, but not sufficiently –Seasonal variation of settling velocity w s or erosion parameter crit –Boundary conditions are already seasonally variable

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Workshop Quest4D –May 14 2009 – WL Borgerhout 11 Import/export at Vlissingen Gross kton/dayNet 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

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Workshop Quest4D –May 14 2009 – WL Borgerhout 12 Validation at Antwerp Boei 84Boerenschans

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Workshop Quest4D –May 14 2009 – WL Borgerhout 13 Validation at Antwerp (2) Bottom concentration too low Peak missing

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Workshop Quest4D –May 14 2009 – WL Borgerhout 14 ETM: Estuarine Turbidity Maximum Neap tideSpring tide

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Workshop Quest4D –May 14 2009 – WL Borgerhout 15 Validation Remote Sensing Data

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Workshop Quest4D –May 14 2009 – WL Borgerhout 16 Validation Remote Sensing Data

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Workshop Quest4D –May 14 2009 – WL Borgerhout 17 Application: 2 nd fairway deepening 1997 – 1998 7.5 m³ capital dredging works Deepening of naturally occuring sills

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Workshop Quest4D –May 14 2009 – WL Borgerhout 18 Application: 2 nd fairway deepening

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Workshop Quest4D –May 14 2009 – WL Borgerhout 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

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Workshop Quest4D –May 14 2009 – WL Borgerhout 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 2 nd fairway deepening on siltation in harbors

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