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QuantAS - Off Numerical simulations of dense bottom currents in the Western Baltic Sea: Quantification of natural, structure-induced and numerical mixing.

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Presentation on theme: "QuantAS - Off Numerical simulations of dense bottom currents in the Western Baltic Sea: Quantification of natural, structure-induced and numerical mixing."— Presentation transcript:

1 QuantAS - Off Numerical simulations of dense bottom currents in the Western Baltic Sea: Quantification of natural, structure-induced and numerical mixing Funded by: Hannes Rennau

2 QuantAS - Off Model area

3 QuantAS - Off Model area Hot spot of water mass transformation

4 QuantAS - Off Model area Hot spot of water mass transformation Drodgen Sill (~8m) Darss Sill (~20m)

5 QuantAS - Off Main pathways Of dense bottom currents

6 QuantAS - Off Main pathways Of dense bottom currents

7 QuantAS - Off Main pathways Of dense bottom currents

8 QuantAS - Off Main pathways Of dense bottom currents

9 QuantAS - Off Main pathways Of dense bottom currents

10 QuantAS - Off Numerical Model - typical ocean-circulation model GETM with state of the art turbulence model GOTM (code developers for both models at IOW) Parallel execution on IOW Linux Cluster

11 QuantAS - Off Simulation of bottom salinity over nine months

12 QuantAS - Off Darss Sill Tracer vs. Drodgen Sill Tracer Tracer release positions

13 QuantAS - Off Darss Sill Tracer vs. Drodgen Sill Tracer Tracer release positions

14 QuantAS - Off Darss Sill Tracer vs. Drodgen Sill Tracer Tracer release positions

15 QuantAS - Off Darss Sill Tracer vs. Drodgen Sill Tracer Tracer release positions

16 QuantAS - Off Model Validation MARNET Arkona Station Burchard, H., F. Janssen, K. Bolding, L. Umlauf, and H. Rennau, Model simulations of dense bottom currents in the Western Baltic Sea, Cont. Shelf Res., 29, , x

17 QuantAS - Off Natural mixing in the numerical model Significantly increased natural mixing: in channels (Kriegers Flak, Bornholm Channel, …) in the area of shallow sills (Drodgen Sill, Darss Sill, …) Burchard, H., F. Janssen, K. Bolding, L. Umlauf, and H. Rennau, Model simulations of dense bottom currents in the Western Baltic Sea, Cont. Shelf Res., 29, , 2009.

18 QuantAS - Off Physical mixing Numerical mixing found method to analyse numerical mixing Rennau, H., and H. Burchard, Quantitative analysis of numerically induced mixing in a coastal model application, Ocean Dynamics, submitted December Burchard, H., and H. Rennau, Comparative quantification of physically and numerically induced mixing in ocean models, Ocean Modelling, 20, , 2008.

19 QuantAS - Off Fundamental knowledge about propagation of dense bottom currents in the western Baltic Sea Model derived amount of physically induced mixing without offshore foundations Conclusions

20 QuantAS - Off Fundamental knowledge about propagation of dense bottom currents in the western Baltic Sea Model derived amount of physically induced mixing without offshore foundations Conclusions numerically induced mixing and physical mixing have same orders of magnitude but different horizontal distribution enhanced numerical mixing –> less physical mixing numerical techniques: adaptive vertical coordinates,…

21 QuantAS - Off Impact of bridge piles

22 QuantAS - Off Impact of bridge piles Lass et al. (2008) distance from pile / m

23 QuantAS - Off Impact of bridge piles - modeling

24 QuantAS - Off Impact of bridge piles - modeling H.U. Lass et al. (2008) PILE distance from pile / m

25 QuantAS - Off GETM 2D Slice Model

26 QuantAS - Off Additional mixing due to Offshore windpark foundations Local model at University of Hannover Regional model at IOW Parameterisaton?

27 QuantAS - Off 'Worst Case Study' with Offshore Windpark

28 QuantAS - Off Influence of Offshore wind park: 10. April, 2004 With windpark without windpark

29 QuantAS - Off windpark Worst Case Study – Simulation with Offshore Windpark Snapshot: bottom salinity (without windpark) – bottom salinity (with windpark)

30 QuantAS - Off windpark Worst Case Study – Simulation with Offshore Windpark Snapshot: bottom salinity (without windpark) – bottom salinity (with windpark) +0.5

31 QuantAS - Off windpark Worst Case Study – Simulation with Offshore Windpark Snapshot: bottom salinity (without windpark) – bottom salinity (with windpark)

32 QuantAS - Off - expected low additional mixing due to Offshore Windpark foundations (needs further calibration in parameterisation and longer time series) - strength of additional mixing mainly dependent on: (1) where to be build (2) windfarm distribution (how many, …) Main conclusions

33 QuantAS - Off Main Focus for last year: - Final results concerning additional mixing of offshore windpark foundations in the Western Baltic Sea (publication in preparation)

34 QuantAS - Off Main Focus for last year: - Final results concerning additional mixing of offshore windpark foundations in the Western Baltic Sea (publication in preparation) - Model nesting: 3D structure development of dense bottom currents in channels (Kriegers Flak North and Bornholm Channel) (publication in preparation)

35 QuantAS - Off Main Focus for last year: - Final results concerning additional mixing of offshore windpark foundations in the Western Baltic Sea (publication in preparation) - Model nesting: 3D structure development of dense bottom currents in channels (Kriegers Flak North and Bornholm Channel) (publication in preparation) - Passive Tracer study (correlations for propagation time of dense bottom currents) (publication in preparation)

36 QuantAS - Off Main Focus for last year:

37 QuantAS - Off Main Focus for last year: - Final results concerning additional mixing of offshore windpark foundations in the Western Baltic Sea (publication in preparation) - Model nesting: 3D structure development of dense bottom currents in channels (Kriegers Flak North and Bornholm Channel) (publication in preparation) - Passive Tracer study (correlations for propagation time of dense bottom currents) (publication in preparation) Rennau, H., and H. Burchard, Quantitative analysis of numerically induced mixing in a coastal model application, Ocean Dynamics, submitted December Burchard, H., and H. Rennau, Comparative quantification of physically and numerically induced mixing in ocean models, Ocean Modelling, 20, , Burchard, H., F. Janssen, K. Bolding, L. Umlauf, and H. Rennau, Model simulations of dense bottom currents in the Western Baltic Sea, Cont. Shelf Res., 29, , Fehmarn Belt Project


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