dawlish warren
DESCRIPTION
Slides to show different management strategies at this coastal spit.TRANSCRIPT
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Dawlish Warren
CASE STUDY
ProcessErosion
Management
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The Process and location
Dawlish Warren
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•The source of material – Langstone Rock
Can you identify joints, lines of weakness, wave cut platform, notch?
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Can you see Langstone rock in the distance?
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The line of the spit on the offshore side towards the River Exe
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Along the crest
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Different size beach material gradually builds up to consolidate the feature
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Inshore, vegetation plays an important role to stabilise the sand
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Small meres appear with brackish water
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The town of Exmouth across the estuary
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Modification by Humans
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At the proximal end buildings occupy the crest line [car park]
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From the car park to the spit visitors are ‘led’ by boardwalk
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Foot erosion is evident aroung picnic benches …
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… or where corners have been cut off
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Railway sleepers used on the onshore side to direct tourists
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In some places even vehicles have contributed
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The key to conservation is to re-establish Marram grass that binds together the sand
and promotes soil development.
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Left alone a thick mat builds up
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Beside the path, experimental plots have been fenced off at different ages
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The contrast between the areas is evident
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Other uses – golf course
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Dog Walking - note the barrier to stop ‘ridge walking’
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Management
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Revetment process at the proximal end
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Lifeboat ramp for rescue users
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Promenade opened in 1993
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Promenade, sea wall and rock armour
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Rock armour used to protect the old sea wall, can you identify any other ‘important’ users?
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Good view from the
railway bridge of wall, rock armour and supply of material
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Sea wall with re-curve
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Built in sections, the toe is protected with granite blocks
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Groynes toward the distal end
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Below the sand gabions
have been used to
encourage the sand to
stabilise
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These have been eroded away particularly at path corner
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Soft Engineering – reused Christmas trees
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The wind blows through sand pitching and building up to bury them. Eventually they should bio-degrade
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Dawlish Warren
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