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Flashcards in UK Physical Deck (23):
1

Coastal management methods

Hold the line, managed retreat, do nothing, advance the line

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ICZM

Integrated Coastal Zone Management. Managing the coast in a holistic way

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Hold the line strategies

E.g. Barton-on-Sea. Stopping more erosion from happening and protecting current coastlines by using a mixture of hard and soft engineering

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Do nothing coastal management method

Allow erosion to happen

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Managed retreat/strategic realignment

E.g. Porlock Bay. Working with nature to allow gradual erosion using natural ecosystems such as rip rap and shingle barriers to protect the coast from storms and high tides, preventing the destruction of farmland and reducing the impact of flooding

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Advance the line strategy

Reclaim land and protect it using hard and soft engineering

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Soft engineering def and eg

Using natural resources to build defences e,g, dredging (using and moving sand from one area to another to build up the beach and widen the distance between the sea and property) and levees (piles of mud and dirt)

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Hard engineering def and eg

Man-made built structures used as defences e.g. Revetments, groynes, sea walls, rip-rap and gabions

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Coastal management at Christchurch Bay

Rip rap and rock grognes for cliff foot erosion
Cliff drainage and cliff regrading to tackle slumping

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Rock grounds at BoS

Pos: maintain the beach by trapping sand transported by LSD, looks natural,nincreases biodiversity
Neg: costs £2000 per metre, still erodes away and needs replacing, rocks can get dislodged and moved

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Rip rap at BoS

Pos: prevents undercutting, looks natural, lasts longer
Neg: cost £2000 per metre, potentially hazardous to tourists as they become jagged overtime

12

Cliff drainage at BoS

Metal pipes replaced with plastic pipes in cliffs.
Pos: don't rust or corrode.p, prevent slumping and saturation.
Neg: can be exposed thus becoming dangerous and hazardous to tourists

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Cliff regrading at BoS

Shaping the cliffs like stairs rather than steep slopes.
Pos: increases stability of the cliff and easy access.
Neg: involves a lot of work, heavy machinery, disrupts countryside life, cost is extremely expensive, water will collect on steps and still be dangerous

14

Calculating CBA

Cost Benefit Analysis = value of property / cost of defences
The higher the value over 1, the more economically viable the defence strategy

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Why did BoS use this certain costal management method

Hold the line: money, tourism and to protect businesses

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Causes and effects of erosion at BoS

Long fetch and SW prevailing winds - causes LSD which removes beach material. Groynes - stop sand supply in Christchurch from Bournemouth. Destructive waves - scouts the beach and undercuts weak cliffs. Cliff slumping - made from sand and clay

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Location of BoS

A337 in Christchurch. SE of New Milton. In Hampshire. ENE of Christchurch Bay

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Drainage basin

The area of land drained by a river and its tributaries

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Watershed

An area of land that separates two drainage basins

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Confluence

Where two rivers meet

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Discharge def

The volume of water flowing through a Chanel at a given time. Measure of in cubic metres per second (cumecs) m3/s

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Fissured

Less permeable, denser, e.g. Clay

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Interfranular

Water can run though, permeable, e.g. Sand