geography: coastal management

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27 Terms

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soft engineering strategies
a strategy for maintaining coastlines that takes a more sustainable and natural approach and does not involve building artificial structures
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hard engineering strategy
a strategy for maintaining coastlines that involves building artificial structures
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hard engineering strategies
groynes, sea walls, rock armour
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soft engineering strategies
beach replenishment, slope stabilisation
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what is beach replenishment?
sand gets pumped onto the existing beach to replace sand that has been lost
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advantages of beach replenishment?
looks natural, increases tourist attraction, cheap
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disadvantages of beach replenishment
has to be maintained regularly as the sediment is easily transported away
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what is slope stabilisation?
drains are installed at the top of a cliff to remove groundwater so the rocks donā€™t become saturated, this prevents slumping and reduces erosion
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advantages of slope stabilisation
prevents mass movement, safer for people on the beach
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disadvantages of slope stabilisation
expensive, cliff can still be eroded from below
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what are groynes?
wooden structure extending into the sea at a right angle from the beach
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advantages of groynes
builds a wide beach, attracts tourists
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disadvantages of groynes
high maintenance as wood rots, leads to increased erosion further along the coast
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what is a sea wall?
a concrete wall that reflects wave energy back towards the sea
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advantages of a sea wall
protects the base of the cliff, stops water going over the top
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disadvantages of a sea wall
expensive, unattractive, restricts beach access
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what is rock armour?
large boulders places at the foot of a cliff which help to absorb wave energy
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advantages of rock armour?
easy to maintain, cheap
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disadvantages of rock armour?
small scale, unattractive as they donā€™t blend in with the natural rocks in that area
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what are hard and soft engineering strategies an example of?
ā€˜hold the lineā€™ strategy of shoreline management
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what are the four shoreline management options?
no intervention, hold the line, managed realignment, advance the line
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what is managed realignment?
allowing the shoreline to change naturally but managing the process
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benefits of managed realignment
creates salt marshes which are diverse ecosystems that provide habitats, cheaper
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costs of managed retreat
loss of land
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what is ā€˜advance the lineā€™?
building new defences in the sea
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costs/benefits of ā€˜advance the lineā€™
reduces power of waves but expensive
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what does the Integrated Coastal Zone Management (ICZM) do?
manage which areas of the coast to protect and how