Other pages in this set

Page 2

Preview of page 2

Here's a taster:

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 Barton at Naish Farm
· West East longshore drift direction
· SW prevailing and dominant wind direction…read more

Page 3

Preview of page 3

Here's a taster:

POOLE AND CHRISTCHURCH
BAYS
Barton on Sea…read more

Page 4

Preview of page 4

Here's a taster:

BARTON-ON-SEA MAP…read more

Page 5

Preview of page 5

Here's a taster:

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 waves, which hit the cliffs at Barton
head-on, causing further damage
· Cliffs have previously receded at rates up to 1 metre a year and several buildings have been lost…read more

Page 6

Preview of page 6

Here's a taster:

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 stronger and
more effective than wood)
· Old timber revetments replaced by 1.8 km rock revetment costing £4.…read more

Page 7

Preview of page 7

Here's a taster:

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 cliff during heavy rainfall
· By 1995 original drainage replaced by a series of underground channels in a fan shape, draining
water to the cliff foot
· Sections of cliff have been regraded and strengthened…read more

Page 8

Preview of page 8

Here's a taster:

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
· Defence works at Naish opposed:
· Economically unviable (6:1 cost-benefit analysis)
· S.S.S.I - cliff erosion exposes geological formations and fossils important for scientific
knowledge
· Diminished supply of sediment would affect down-drift areas e.g.…read more

Page 9

Preview of page 9

Here's a taster:

Vegetation
Rock groynes
Cliff regrading
Rock Armour
Cliff Drainage
Stable bay…read more

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »See all resources »