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DSD-INT 2019 Modelling of the Danube Delta and of the Razelm-Sinoe lagoon-Bajo

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Presentation by Marco Bajo (ISMAR, Italy), at the DANUBIUS Modelling Workshop, during Delft Software Days - Edition 2019. Friday, 8 November 2019, Delft.

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DSD-INT 2019 Modelling of the Danube Delta and of the Razelm-Sinoe lagoon-Bajo

  1. 1. DANUBIUS Conference Modelling of the Danube Delta and of the Razelm-Sinoe lagoon Marco Bajo12*, Irina Dinu2, Georg Umgiesser1, Adrian Stanica2 1 Institute of Marine Sciences (ISMAR), Venice, Italy 2 National Institute for Marine Geology and Geoecology, GEOECOMAR, Bucharest, Romania * marco.bajo@ismar.cnr.it
  2. 2. DANUBIUS Conference Summary • Black Sea and Danube delta modelling; • Validation; • Results; • Razelm-Sinoe modelling; • Sensitivity simulation results; • Conclusions.
  3. 3. DANUBIUS Conference Model: ⚫ Shallow water equations; ⚫ 3D formulation with z-layers; ⚫ Baroclinic terms; ⚫ Vertical turbulence with GOTM. SHYFEM: Shallow water equations
  4. 4. DANUBIUS Conference Model domain: grid Horizontal resolution: - 83,938 elements - Maximum size ~ 12km - Minimum size < 50m - Higher resolution near the Romanian coast Vertical resolution: The first layer is 2m thick, then the layers gradually increase with depth. Surface is well defined, with 8 layers in 20m.
  5. 5. DANUBIUS Conference Initial conditions: temperature and salinity Temperature and salinity from the ADCP data merging of the MEDAR project. Data are in a 0.1 horizontal grid and 21 vertical levels.
  6. 6. DANUBIUS Conference Initial conditions: temperature and salinity Spin-up: ⚫ Simulation with T/S fields constant in time for some weeks (January climatology) → steady baroclinic simulation; ⚫ Simulation 2-year long. First year was considered spin-up time, second year (2009) was used in the results.
  7. 7. DANUBIUS Conference Lateral boundary condition: Danube For the Danube water discharge we used 2009 data from two sources (Bajo et al., 2014). Dniepr river, as well as other rivers, are climatological. Danube branches: Kilia = 60%, Sulina = 20%, St. Gheorge = 20%
  8. 8. DANUBIUS Conference Lateral boundary condition ⚫ River salinity was set to zero; ⚫ Measured Danube water temperature was used; ⚫ Other rivers (South Bug, Ingul, Dnestr, Rioni, Coruh, Kizil, Sakarya, Yesil Irmak, Kodori, Bzyb) were considered with climatological yearly discharges; ⚫ Bosphorus strait with monthly discharge and a 2- layer flow triggered by different salinity (surface layer 20 PSU, bottom layer 37 PSU).
  9. 9. DANUBIUS Conference Surface boundary conditions ECMWF fields, 0.5 degrees, 6 hours: • 10m wind • Surface atmospheric pressure NCEP/NCAR Reanalysis Project (NOAA/ESRL Physical Sciences Division), 2 degrees, 6 hours: • Solar radiation • Cloudiness • Humidity • Rain • Air temperature HEAT MODULE
  10. 10. DANUBIUS Conference VALIDATION: sea level
  11. 11. DANUBIUS Conference VALIDATION: SST
  12. 12. DANUBIUS Conference VALIDATION: Temperature profiles 1-2 June 2009
  13. 13. DANUBIUS Conference VALIDATION: Salinity profiles 1-2 June 2009
  14. 14. DANUBIUS Conference RESULTS: Salinity average maps 3-month average (Spring)
  15. 15. DANUBIUS Conference RESULTS: Salinity average maps 3-month average (Autumn)
  16. 16. DANUBIUS Conference Conclusions: Danube delta • Set-up of a high resolution 3D baroclinic model for the Danube delta; • Validation in 4 stations. Correlation 0.9 for surface temperature, 0.7 for sea level; • Temperature and salinity profiles: too much mixing at the surface; • Wind is the primary factor determining the direction of the plume; • In winter and spring two anticyclonic eddies can form with freshwater south of St. Gheorge and Kilia branches; • Further measurements are necessary to study the Delta dynamics more in details.
  17. 17. DANUBIUS Conference Razelm-Sinoe: study area • The Razelm-Sinoe lagoon is a brackish water system south of the Danube St. Gheorge branch; • Some channels link the system to the Danube branch.
  18. 18. DANUBIUS Conference Razelm-Sinoe: freshwater input • We have daily discharges of the three channels (Dunavat, Mustaca and Dranov) for three years. 2003 2004 2006
  19. 19. DANUBIUS Conference Razelm-Sinoe: grid • The two sub- basins have small communication channels; • Connection with the sea is often closed; • 18,917 elements; • Max depth = 3m
  20. 20. DANUBIUS Conference Razelm-Sinoe: salinity results 2003 2004 • Simulations with real wind, temperature and salinity; • Temperature and salinity are transported; • Simulations of three years: 2003, 2004, 2006
  21. 21. DANUBIUS Conference Razelm-Sinoe: salinity results 2006
  22. 22. DANUBIUS Conference Razelm-Sinoe: water renewal time WRT is high in general, but can be reduced by freshwater inputs and the wind. Exchanges with the sea are limited.
  23. 23. DANUBIUS Conference Conclusions: Razelm-Sinoe • Some preliminary simulations have been run; • More complex simulations are planned, with a full- baroclinic set-up and real forcing; • Results show limited dynamics, regulated mainly by the wind; • No tidal action and negligible water exchanges with the sea; • More data are needed.
  24. 24. DANUBIUS Conference References: Bajo, Marco, Ferrarin, Christian, Dinu, Irina, Umgiesser, Georg, Stanica, Adrian. (2014). The water circulation near the Danube Delta and the Romanian coast modelled with finite elements. M Bajo, C Ferrarin, I Dinu, G Umgiesser, A Stanica. Continental Shelf Research 78, 62-74. Dinu, Irina, Umgiesser, Georg, Bajo, Marco, De Pascalis, Francesca, Stanica, Adrian, Pop, Cornel, Dimitriu, Radu, Nichersu, Iulian, Constantinescu, Adrian. (2015). Modelling of the response of the Razelm- Sinoe lagoon system to physical forcing. 5-18. 10.5281/zenodo.45064.

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