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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.

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Presentation on theme: "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."— Presentation transcript:

1 Workshop Quest4D May LTV-slib: Modelling of mud dynamics Joris Vanlede (WL) Thijs van Kessel (Deltares) Marieke Eleveld (IVM) Daphne van der Wal (NIOO)

2 Workshop Quest4D –May – 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 –…

3 Workshop Quest4D –May – 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)

4 Workshop Quest4D –May – 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

5 Workshop Quest4D –May – 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

6 Workshop Quest4D –May – 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).

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

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

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

10 Workshop Quest4D –May – 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

11 Workshop Quest4D –May – 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

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

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

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

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

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

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

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

19 Workshop Quest4D –May – 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

20 Workshop Quest4D –May – 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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