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Slide 1

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Coastal Sand dunes and Salt
marshes…read more

Slide 2

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Definition of a Sand Dune:
Concentrations of mound-like
landforms composed of sand that has
been blown off the beach by onshore
winds.…read more

Slide 3

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Slide 4

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The start of a sand dune
Where sufficient sand is deposited in the
intertidal zone it may, on drying out, be blown
up the beach by saltation (bounced along the
This is most likely where there is a large tidal
range and a gently sloping sandy beach.…read more

Slide 5

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Initially sand may become trapped by debris
towards the back of the beach.
For example, on a high berm or storm beach.
The sand has a high pH because it's formed from
the carbonate of seashells.…read more

Slide 6

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The sand caught by debris isn't moisture
retentive which means it cannot hold water.
This is due to the sand particles being very
coarse because the coarser the particles, the
less retention.
Because the potential of moisture retention is
low, only very hardy pioneer plants such as
Lyme grass can colonise at this stage.…read more

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Slide 9

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