JURASSIC COAST

names	landform	geology	geology influence	climate influence
Old Harry	stack	cretaceous chalk discordant coastline	formed on a headland of chalk this causes wave refraction to attack the headland the rock has joints and bedding planes (weaknesses)	cliffs were originally created in a much warmer climate stormier climates will increase erosion
Swanage Bay	headlands and bay	clay and sand discordant coastline	softer rock	n/a
Durdle Door	arch	Portland limestone concordant coastline	it is harder rock so it was resisted erosion unlike the surrounding area	warmer climate means less freeze-thaw weathering
Swanage Beach	beach	sands of soft rock and limestone	wave refraction from the two headlands creates reduced energy which leads to a beach	sediment moves from the southern end of the beach to the north due to the prevailing wind
Chesil Beach	tombolo	sand and shingle	n/a	prevailing wind determines direction of LSD calmer waters allow deposition

human impact

explain

pros

cons

building hotels

they implemented drainage pipes to stop a slip plane being created after a major slip in 2012

built hotels and beach huts

drainage pipes built into the cliff to remove excess water

income

tourism

avoid destroying houses

n/a

groynes

beach replenishment

sea wall

18 built in 2005

90,000m³ every 20 years

concrete sea wall built in 1920

protect the landscape behind

groynes are extremely successful

costly

beach needs replenishment every 20 ears

the wooden groynes are already starting to fall apart

groynes keep sediment from places beyond the final groyne so there is less protective beach in the north