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Case Studies: Coasts
Terms in this set (8)
Where is Start Bay located?
South-East Devon; South-West England
Start Point; Hallsands; Beesands; Sunnydale; Torcross
What is the geology of Start Bay?
Devonian Schists with Quartz/ Mica Grey Schists (Start Point; Hallsands): Relatively hard; resistant
Devonian slate, sandstone and limestone (Majority of Start Bay): Not as resistant
Background information on Hallsands
Fishing village in 19th Century. John Jackson excavated shingle offshore from Hallsands ( 650,000 tonnes to Devonport). 1917: storm: Beach not replenished; shingle fell in; seawall did not protect village.
What coastal defence strategies have been used at Hallsands?
North Hallsands: Rip-Rap; cost £100,000: protects 9 properties. Not significantly high cost-benefit analysis: 9.13
Beesands Village and Village Green Defence Strategies
Wave Return Sea Wall and Rock Armour: Cost - £3 million. Lifespan: 100 years; 28 properties; 1992. Not high on cost-benefit analysis: 3.53
Rip-rap; cost - £200,000; 25 years; 2001: Not significantly high; 13.25 (Rocks from Norway)
Sunnydale Defence Strategies
Gabions; cost £30,000; 20 years; 7 properties;1998; 11.7
Torcross Defence Strategies
Wave-Return Sea Wall; cost - £2million; 80 years; 23 properties; 1980
Shingle Bastion; cost £25,000; 5 years; 2003/2005
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