Coasts: Landforms & Coastal Management — GCSE Geography Revision
Revise Coasts: Landforms & Coastal Management for GCSE Geography. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel and OCR.
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Go to Ecosystems: Tropical RainforestsWhat is Coasts: Landforms & Coastal Management?
Coastal landforms are created by either erosion or deposition. Erosional landforms include headlands and bays, cliffs, wave-cut platforms, caves, arches, stacks, and stumps. Depositional landforms include beaches, spits, bars, and tombolos. The management of these coastlines often involves difficult decisions about which areas to protect and which to leave to natural processes, a concept known as Integrated Coastal Zone Management (ICZM).
Board notes: Students across all boards (AQA, Edexcel, OCR) must be able to identify and explain the formation of both erosional and depositional coastal landforms. The use of annotated diagrams is a crucial skill for exam success in this topic.
Step-by-step explanationWorked example
Formation of a spit at the mouth of an estuary: 1. Longshore drift transports sediment along the coast. 2. When the coastline changes direction at an estuary, the river current slows the longshore drift, causing deposition. 3. A ridge of sand and shingle (the spit) builds up and extends out into the estuary. 4. The end of the spit is often curved by the wind and secondary currents, forming a hook. 5. A salt marsh often develops in the sheltered, low-energy zone behind the spit.
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Common mistakes
- 1Getting the sequence of cave-arch-stack-stump formation wrong. The correct sequence is that wave erosion exploits a weakness in a headland to form a cave, which then erodes through to the other side to form an arch. The roof of the arch eventually collapses, leaving a detached pillar of rock called a stack, which is then eroded down to a stump.
- 2Confusing a spit and a bar. A spit is a ridge of sand or shingle that is joined to the land at one end but projects out into the sea. A bar is a spit that has grown across a bay to join two headlands.
- 3Thinking that all coastlines are being eroded. Some coastlines, known as emergent coasts, are actually gaining land where deposition rates are high or where the land is rising relative to sea level (isostatic rebound).
Coasts: Landforms & Coastal Management exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Coasts: Landforms & Coastal Management
Core concept
Coastal landforms are created by either erosion or deposition. Erosional landforms include headlands and bays, cliffs, wave-cut platforms, caves, arches, stacks, and stumps. Depositional landforms inc…
Frequently asked questions
How is a wave-cut platform formed?
A wave-cut platform is a flat, rocky area at the base of a cliff. It is formed as waves erode the base of the cliff, creating a wave-cut notch. This undercuts the cliff, which eventually collapses. The process repeats, causing the cliff to retreat and leaving the platform behind.
What is managed retreat?
Managed retreat (or coastal realignment) is a soft engineering strategy where an area of coast is deliberately allowed to flood or erode. It is a sustainable approach that creates new habitats like salt marshes, which are effective natural defences against flooding and erosion.