GCSE · Geography · AQA · Spec 8035

Hard engineering coastal management

Build a wall to save one town, and you might speed up erosion for the places further along the coast.

Coastal management · Weigh it up

An imaginary town is losing its cliff to the sea. Would you build a sea wall?

The claim

A sea wall is the best way to protect this town.

Place each piece of evidence to load the balance. Mark the strong ones — they count double.

  1. A sea wall is very effective at reducing erosion and flood risk.

    Evidence 1: does it support or challenge the claim?

  2. Hard engineering like a sea wall gives immediate protection.

    Evidence 2: does it support or challenge the claim?

  3. Residents campaigning to save their homes want action against erosion now.

    Evidence 3: does it support or challenge the claim?

  4. It is the most expensive option: millions to build and maintain, with frequent maintenance.

    Evidence 4: does it support or challenge the claim?

  5. A sea wall can cause increased erosion further along the coast.

    Evidence 5: does it support or challenge the claim?

  6. Environmental groups warn that sea walls can alter sediment flows and harm coastal habitats.

    Evidence 6: does it support or challenge the claim?

  7. Rock armour is relatively cheaper than a sea wall and blends in with its surroundings.

    Evidence 7: does it support or challenge the claim?

  8. Gabions are cost-effective and quick to install.

    Evidence 8: does it support or challenge the claim?

Exam line: Weighing beats listing. Say which piece of evidence tips the balance for you, and why.

Two ways to manage a coast

Hard engineeringvsSoft engineering

Read across each row: the goal is shared, the method is not.

Focus

The goal

Hard engineering

Protect the coast from erosion and flooding

Soft engineering

Reduce erosion and flooding

The insight

Same aim. So 'hard' and 'soft' are about HOW you protect the coast, not what you protect it from.

What it uses

Hard engineering

Artificial structures

Soft engineering

Natural processes

Relationship with nature

Hard engineering

Acts as a physical barrier that blocks natural processes

Soft engineering

Works with natural processes rather than blocking them

Environmental impact

Hard engineering

Greater, because it blocks natural processes

Soft engineering

Lower, because it works with natural processes

Coastal management · The four structures

Four ways to hold back the sea
TOWN (on the cliff top)CliffBeachSeaLongshore drift carries sediment along the coastSea wallRock armourGabionsGroynes

Showing 2 layers: The natural coast, Hard engineering structures

Layers

Explore

tap a structure ↓

Artificial structures: a physical barrier between the sea and the land.

Tap a structure to see how it protects the coast. Switch the structures off to see the natural coast underneath.

The catch with groynes

?

Reason it through

How can groynes that protect one beach cause more erosion somewhere else?

Link 1 of 4

First link · your turn

Longshore drift carries sediment along the coast. What does a groyne do to it?

2
Locked — reveal the link above first
3
Locked — reveal the link above first
4
Locked — reveal the link above first

Coastal management · Who wants what?

Four groups, one coastline

Pick a group to see its view of hard engineering, then read how the conflict can be resolved.

Should this stretch of coast be protected with hard engineering?

Local residents

  • Our homes and livelihoods come first.
  • We want immediate action against erosion and flooding.
  • Residents campaigning to protect their houses are the group most likely to support hard engineering.

Local businesses

  • We may support groynes, because wide beaches attract tourists.
  • But large sea walls or groynes could put tourists off if they look unattractive or make the beach smaller.

Environmental and conservation groups

  • We may oppose sea walls, groynes and rock armour.
  • They can disrupt ecosystems by altering sediment flows and harming marine and coastal habitats.

The council

  • We may oppose coastal defences because of their high cost.
  • And they may not stop erosion in the long run.

Common ground

  • Each group is a stakeholder: a group involved in, or interested in, changes at the coast. Their views are different, and they can conflict.

Try each group in turn and ask what it stands to gain or lose.

Resolving the conflict: integrated coastal zone management

No single group can get everything it wants. An integrated coastal zone management approach brings the different stakeholders in, so that economic, environmental and community needs are balanced as far as possible. It is not simply choosing the least expensive method.

Comparing 4 positions: Local residents, Local businesses, Environmental and conservation groups, The council.

Watch out: Integrated management is not the same as picking the cheapest method.

WHAT YOU'VE LEARNED

A quick recap of today's lesson.

Sea walls, groynes, rock armour and gabions each protect the coast at a price

What you need to know

  • Coastal management protects communities and environments from threats like flooding and erosion, while balancing environmental and economic concerns.
  • Hard engineering uses artificial structures that act as a physical barrier to natural processes; soft engineering works with natural processes and has a lower environmental impact.
  • How each structure protects: sea walls deflect wave energy, groynes trap sediment moved by longshore drift, rock armour absorbs wave energy, gabions reduce the risk of cliff sliding.
  • Every structure has benefits and costs, stakeholders can hold conflicting views about them, and integrated coastal zone management tries to balance their needs.

The big picture

Hard engineering protects the coast with artificial structures (sea walls, groynes, rock armour and gabions) that block natural processes and give immediate protection. Each one protects in its own way, and each comes at a price: money, maintenance, harm to habitats, or more erosion further along the coast. Residents, businesses, environmental groups and councils want different things from the coast, so an integrated approach tries to balance economic, environmental and community needs.

Key points

1Sea walls: very effective against erosion and flooding, but the most expensive option (millions to build and maintain) and they can increase erosion further along the coast.
2Groynes: maintain and widen beaches, which protect the coast and attract tourists, but they starve other areas of sediment and need maintenance.
3Rock armour: relatively cheaper than a sea wall and blends in, but sourcing and transporting the rocks can be costly and environmentally damaging.
4Gabions: cost-effective and quick to install, but not durable because the wires may rust, and not attractive, which can deter tourists.
5Integrated coastal zone management involves the different stakeholders to balance economic, environmental and community needs as far as possible. It is not simply choosing the cheapest method.

Worked example

Problem

An imaginary seaside resort wants to build groynes along its main beach. Evaluate the plan, using what groynes do and how two different stakeholder groups might react.

⚠ Watch out

Writing that hard engineering simply 'stops erosion'. Each structure protects one place at a price (money, maintenance, habitats, or more erosion further along the coast), so a strong answer always names the price as well as the protection.

🧠

Memory hook

Every defence sends a bill: to the council (the cost), to the future (the maintenance) or to the neighbours further along the coast (the extra erosion).

✓

Check yourself

Your town can afford one hard engineering structure. Which would you choose, what would it cost you, and who else along the coast might lose out because of your choice?

Flashcards

(15)
What is coastal management trying to achieve?
Protecting communities and environments from threats such as flooding and erosion, while balancing environmental and economic concerns.
What is hard engineering?
Using artificial structures to protect the coast from erosion and flooding. They act as a physical barrier to natural processes and give immediate protection.
Hard vs soft engineering: what's the key difference?
Hard engineering blocks natural processes with artificial structures. Soft engineering makes use of natural processes, so it has a lower environmental impact.
Sea wall: what is it and how does it protect the coast?
A concrete wall built at the base of the cliff. It deflects wave energy.
Sea wall: one benefit and two costs
Benefit: very effective at reducing erosion and flood risk. Costs: the most expensive option (millions to build and maintain, frequent maintenance) and it can increase erosion further along the coast.
Groynes: what are they and how do they work?
Barriers built at right angles to the coast that trap sediment moved by longshore drift.
Groynes: benefits and costs
Benefits: reduce erosion and maintain and widen beaches, which protect the coast and attract tourists. Costs: they starve other areas of sediment, increasing erosion elsewhere, and need maintenance.
Rock armour: how it works, plus one benefit and one cost
Large boulders absorb wave energy. Benefit: relatively cheaper than sea walls and blends in with the surroundings. Cost: sourcing and transporting the rocks can be costly and environmentally damaging.
Gabions: their job, plus their benefits and drawbacks
Placed at the base of the cliff to reduce the risk of cliff sliding. Cost-effective and quick to install, but not durable (the wires may rust, a risk to people and animals) and not attractive, which can deter tourists.
What is a stakeholder?
Any group or individual involved in, or interested in, changes at the coast.
Which stakeholders are most likely to support hard engineering, and why?
Local residents campaigning to protect their houses. They put their homes and livelihoods first and want immediate action against erosion and flooding.
Why do local businesses have mixed views on hard engineering?
They may support groynes because wide beaches attract tourists, but large sea walls or groynes could deter tourists if they look unattractive or make the beach smaller.
Why might environmental groups oppose sea walls, groynes and rock armour?
They can disrupt ecosystems by altering sediment flows and harming marine and coastal habitats.
Why might a council oppose coastal defences?
Because of their high cost, and because they may not stop erosion in the long run.
What does integrated coastal zone management do?
It involves the different stakeholders so that economic, environmental and community needs are balanced as far as possible. It is not simply picking the cheapest method.

Tap any card to flip it, or use Study as deck to go through them one at a time. In the full lesson these run as a spaced-repetition deck — you rate each card Hard, Good or Easy and the tricky ones keep coming back until they stick.

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