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

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Presentation on theme: "Investigating the Pathways of Marine Debris Found in the Arafura and Timor Seas David Griffin, CAWCR Ilse Kiessling, DEWHA 29 July 2008."— Presentation transcript:

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

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

3 Pathways of Marine Debris Many thousands of tonnes of nets

4 Pathways of Marine Debris not just ugly

5 Pathways of Marine Debris

6 high concentrations: northern Gulf of Carpentaria

7 Pathways of Marine Debris White (2004) hypothesis

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

9 Pathways of Marine Debris

10

11

12

13

14 Add wind*3% to 0-10m, daily average current

15 Pathways of Marine Debris

16

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19 Feb 0-10m

20 Pathways of Marine Debris May 0-10m

21 Pathways of Marine Debris Aug 0-10m

22 Pathways of Marine Debris Nov 0-10m

23 Pathways of Marine Debris

24

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

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

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

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