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Managing Cliff Erosion
BARTON-ON-SEA

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CONTEXT
· Located at centre of Christchurch Bay, Hampshire

· 30 m high cliffs at Barton under constant attack from wave erosion

· Long history of coastal protection (first groynes built in 1930's)

· Intensive 2 km deep strip of urban development at Barton

· Holiday accommodation (caravans/chalets) west of…

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POOLE AND CHRISTCHURCH
BAYS


Barton on Sea

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BARTON-ON-SEA MAP

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EROSION AT BARTON

· Construction of the major groyne at Hengistbury Head and coastal defences at Bournemouth
reduce sediment reaching Barton by longshore drift

· Consequently, there is no longer a beach to protect the cliff foot from wave erosion at Barton

· Predominant south-westerly winds produce the highest energy…

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CLIFF FOOT STRATEGIES
· 1966-1968 - 1,800 m cliff foot protected by timber groynes and revetments of wooden piles filled
with rock

· 1974 - Severe storms caused waves to breach revetments, damaging 200 m of defences

· Replaced by 7 rock strongpoints aiming to control longshore drift (rock boulders…

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CLIFF FACE STRATEGIES
· 1964-68 - First engineering works at Barton comprised cliff drainage scheme using an interlocking
steel barrier to intercept the water movement in the cliff which causes mass movement

· 1974 - The same storm which damaged revetments saturated the clay undercliff causing mass
movement of the…

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LOCAL ISSUES
· So far strategies in use since 1960's generally successful at reducing cliff erosion

· However, the cost of keeping erosion at bay is very high (£10 million has already been spent)

· Several properties and businesses still at risk - unable to sell or claim compensation

·…

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Vegetation



Rock groynes
Cliff regrading

Rock Armour

Cliff Drainage
Stable bay

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