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Investigating the Pathways of Marine Debris Found in the Arafura and Timor Seas

Investigating the Pathways of Marine Debris Found in the Arafura and Timor Seas. David Griffin, CAWCR Ilse Kiessling, DEWHA 29 July 2008. Marine debris – not easy to clean up. Many thousands of tonnes of nets. not just ugly. high concentrations: northern Gulf of Carpentaria.

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Investigating the Pathways of Marine Debris Found in the Arafura and Timor Seas

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  1. Investigating the Pathways of Marine Debris Found in the Arafura and Timor Seas David Griffin, CAWCR Ilse Kiessling, DEWHA 29 July 2008

  2. Marine debris – not easy to clean up Pathways of Marine Debris

  3. Many thousands of tonnes of nets Pathways of Marine Debris

  4. not just ugly Pathways of Marine Debris

  5. Pathways of Marine Debris

  6. high concentrations: northern Gulf of Carpentaria Pathways of Marine Debris

  7. White (2004) hypothesis Pathways of Marine Debris

  8. Bluelink Reanalysis: 0-10m, daily velocity average,release items for 1 year, follow them for another year Pathways of Marine Debris

  9. Pathways of Marine Debris

  10. Pathways of Marine Debris

  11. Pathways of Marine Debris

  12. Pathways of Marine Debris

  13. Pathways of Marine Debris

  14. Add wind*3% to 0-10m, daily average current Pathways of Marine Debris

  15. Pathways of Marine Debris

  16. Pathways of Marine Debris

  17. Pathways of Marine Debris

  18. Pathways of Marine Debris

  19. Feb0-10m Pathways of Marine Debris

  20. May0-10m Pathways of Marine Debris

  21. Aug0-10m Pathways of Marine Debris

  22. Nov0-10m Pathways of Marine Debris

  23. Pathways of Marine Debris

  24. Pathways of Marine Debris

  25. Conclusions • Do nets move at the 0-10m velocity? • If so, the model suggests they must come from the Pacific. • But few nets are found on the Great Barrier Reef • probable explanation: • the model has too much flow through Torres Pathways of Marine Debris

  26. Recommended future work • include effect of tides on bottom drag • determine drift characteristics of derelict nets • validate model by releasing drifters in Arafura Sea Pathways of Marine Debris

  27. Thank you Email: David.Griffin@csiro.au Web: www.cmar.csiro.au

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