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Piers Larcombe RPS MetOcean

Shelf sediment transport in NW Australia over decades to centuries: a knowledge gap for science, development & regulation. Piers Larcombe RPS MetOcean. Marine developments: Design of structures Assessment of environmental impacts. Marine Scientists Environmental Regulators

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Piers Larcombe RPS MetOcean

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  1. Shelf sediment transport in NW Australia over decades to centuries: a knowledge gap for science, development & regulation Piers LarcombeRPS MetOcean • Marine developments: • Design of structures • Assessment of environmental impacts Marine Scientists Environmental Regulators Marine Engineers Developers & Operators WAMSI Perth 21st Feb 2013 5 mins

  2. NW Australia has: much of ecological value Key ecological features represented in the North-west Commonwealth Marine Reserves Network

  3. NW Australia has: many cyclones

  4. Belderson et al. (1982) NW Australia will have: bed sediment transport pathways • Scales = relevant to developments • >decades • 10s-100s km • Ecology = f (sedimentology) • Engineering = f (sedimentology) • (NB – this is not transport AT the coast)

  5. NW Australia has: major development projects 8 proposals requiring ‘substantial’ dredging Total ~200 M m3 Pilbara / W. Kimberley Dredged channels, up to >30 km long Durations >many decades Dredging volume >150 M m3 WA EPA (Oct. 2012)

  6. NW Australia has: …knowledge gaps that WAMSI can help fillto enhance: environmental management & project design • Shelf Sedimentary Research • To define the pathways’ location and extent • e.g. Where are the critical regions? • Wrt removal (dredging) and addition (disposal) of sediment • At EIA stage - Improve assessment of pathways • Many aspects, but esp. testing of directions • Bedforms, Deposits, Spatial gradients • Assess in-situ sediment production rates (biogenic sediment)

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