g9 - dune ridges etc. Growth of foredunes Lindsey Wood,...

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Coastal Environments Sand Dune Systems
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Lindsey Wood, liw2, 022423830 2 Coastal Dunes Temperate latitudes. Accumulation of windblown sediment needed in backshore zone. UK - around 7-8% of coast has vegetated dunes. Needs vegetation, low rainfall, strong winds and abundant sand.
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Lindsey Wood, liw2, 022423830 3 Sand Movement Saltation sand blown downwind. Transfers energy through other grains. 75% of sand moved by this method. Surface Creep By product of saltation. Pushed along sand surface Must be dry Sand Transport Rate 0 200 400 600 800 1000 0 10 20 Wind Velocity Weight of Sand Transported Sand Transport Rate
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Lindsey Wood, liw2, 022423830 4 Formation Embryo dunes obstacle forces deposition of sand Embryo Fore Grey Foredunes embryo dunes coalesce laterally Grey dunes includes 1st, 2nd, 3rd
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Unformatted text preview: dune ridges etc. Growth of foredunes Lindsey Wood, liw2, 022423830 5 Classification Type Morphology Vegetation Embryo dune Unconnected mounds, 1 or 2m Sand Twitch & Sea Lyme Foredune Shore parallel ridges. Up to 10m Marram Grass 1 st Dune ridge 10 30m. Steep windward slope, gentler lee slope Marram Grass dominant 2 nd Dune ridge Larger than 1 st dune ridge. Up to 30m Marram Grass starts to die off Lindsey Wood, liw2, 022423830 6 Further Classification Bay Dunes eg. Studland Spit Dunes eg. Ynyslas, see right Hindshore Dunes eg. Merthyr Mawr Ness or Forland Dunes eg. Tentsmuir Offshore Island Dunes eg. Scott Head http://www.bbc.co.uk/wales/mid/fun/wa llpaper/pages/ynyslas_sand_dunes.shtml Ynyslas Dunes dunes...
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This note was uploaded on 02/12/2011 for the course GEO 2200 taught by Professor Wolf during the Spring '08 term at University of Florida.

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g9 - dune ridges etc. Growth of foredunes Lindsey Wood,...

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