investigating the pathways of marine debris found in the arafura and timor seas
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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. Marine debris – not easy to clean up. Many thousands of tonnes of nets. not just ugly. high concentrations: northern Gulf of Carpentaria. - PowerPoint PPT PresentationTRANSCRIPT
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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
![Page 2: Investigating the Pathways of Marine Debris Found in the Arafura and Timor Seas](https://reader035.vdocuments.us/reader035/viewer/2022062806/56814f68550346895dbd1f0b/html5/thumbnails/2.jpg)
Pathways of Marine Debris
Marine debris – not easy to clean up
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Pathways of Marine Debris
Many thousands of tonnes of nets
![Page 4: Investigating the Pathways of Marine Debris Found in the Arafura and Timor Seas](https://reader035.vdocuments.us/reader035/viewer/2022062806/56814f68550346895dbd1f0b/html5/thumbnails/4.jpg)
Pathways of Marine Debris
not just ugly
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Pathways of Marine Debris
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Pathways of Marine Debris
high concentrations: northern Gulf of Carpentaria
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Pathways of Marine Debris
White (2004) hypothesis
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Pathways of Marine Debris
Bluelink Reanalysis: 0-10m, daily velocity average,release items for 1 year, follow them for another year
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
Add wind*3% to 0-10m, daily average current
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
Feb0-10m
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Pathways of Marine Debris
May0-10m
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Pathways of Marine Debris
Aug0-10m
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Pathways of Marine Debris
Nov0-10m
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Pathways of Marine Debris
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Pathways of Marine Debris
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Pathways of Marine Debris
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
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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