WJEC A-Level Geography 601-8455-3
Coastal Landscapes
Glaciated Landscapes
Tectonic Hazards
Changing Places
Water and Carbon Cycles
Global Migration
Global Governance of the Oceans
EcosystemsContemporary theme
Economic Growth and Challenge: IndiaContemporary theme
Economic Growth and Challenge: ChinaContemporary theme
Development in an African ContextContemporary theme
Energy Challenges and DilemmasContemporary theme
Weather and ClimateContemporary theme
Fieldwork and Geographical Skills
Coastal Landscapes
Human impact on coastal landscape systems
- 2 things to know
- AS Unit 1
Overview
How offshore dredging damages a coastal system, how trampling degrades a sand dune and why river management inland can cause coastal erosion.
What you need to know
Answer each one before you reveal it.
Give two positive impacts of human activity on coastal landforms.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Give two positive impacts of human activity on coastal landforms.
Model answer
Dune stabilisation and replanting that rebuild a degraded dune system, and designation as a protected site that limits damaging development.
- 2
How does beach nourishment have a positive effect on the coastal system?
Model answer
It restores sediment to a store that had been depleted, so the beach can once again absorb wave energy and supply material along the coast.
- 3
Explain how offshore dredging damages a coastal system.
Model answer
Removing sediment from the sea bed cuts the supply that would have moved shoreward, and the deeper water lets larger waves reach the coast unbroken.
- 4
Describe how trampling degrades a sand dune.
Model answer
Feet break the vegetation cover, the bare sand is exposed to the wind, and a blowout develops that enlarges as more sand is removed.
- 5
How does building a marina or harbour arm alter longshore drift?
Model answer
The structure interrupts the movement of sediment along the coast, so material accumulates on the updrift side and the downdrift beach is starved.
- 6
Explain why river management inland can cause coastal erosion.
Model answer
Dams and reservoirs trap sediment that would have reached the coast, so the sediment budget of the cell turns negative and its beaches shrink.
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