Coastal processes shape our shorelines through powerful forces of transportation,...
Geography466 views·Updated 29 Jun 2026·2 pagesComprehensive Notes on AQA A-Level Geography Coasts
Millie@milliemurphyx
1
of 2
Coastal Transportation
Ever wondered how beaches get their sand or why pebbles end up in certain spots? Coastal transportation is the process where waves, tides, and currents act like conveyor belts, moving different materials along the coast.
There are four main ways sediment travels along coastlines. Solution dissolves materials like limestone directly into slightly acidic seawater - you can't even see it happening! Saltation bounces pebbles and gravel along the seabed in a hopping motion.
Traction is the most dramatic - massive boulders get pushed and rolled along the seafloor by powerful wave forces. Meanwhile, suspension carries fine materials like silt and clay by whipping them up in turbulent water, creating that murky look you see in rough seas.
Key insight: The energy from waves, tides, and currents provides all the power needed to transport everything from tiny particles to house-sized boulders.
2
of 2
Deposition and Weathering
Deposition happens when water and wind basically get too tired to carry their load any further. Marine deposition occurs when seawater drops its sediment, whilst Aeolian deposition happens when wind loses its carrying power.
This process kicks in when sediment load exceeds what water or wind can actually handle. Think of it like an overloaded shopping bag - eventually something's got to give! Sediment load increases during events like landslides, or when wind and water lose energy and slow right down.
Freeze-thaw weathering is nature's jackhammer, working on cliffs in areas where temperatures bounce above and below freezing. Water seeps into rock joints and cracks, then expands by about 9% when it freezes - imagine that pressure building up!
Remember: Weathering weakens cliffs first, making them much more vulnerable to erosion later - it's like softening them up for the knockout punch.
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Geography466 views·Updated 29 Jun 2026·2 pagesComprehensive Notes on AQA A-Level Geography Coasts
Millie@milliemurphyx
Coastal processes shape our shorelines through powerful forces of transportation, deposition, and weathering. Understanding how waves, tides, and weather break down rocks and move sediment helps explain why coastlines constantly change over time.
1
of 2
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Coastal Transportation
Ever wondered how beaches get their sand or why pebbles end up in certain spots? Coastal transportation is the process where waves, tides, and currents act like conveyor belts, moving different materials along the coast.
There are four main ways sediment travels along coastlines. Solution dissolves materials like limestone directly into slightly acidic seawater - you can't even see it happening! Saltation bounces pebbles and gravel along the seabed in a hopping motion.
Traction is the most dramatic - massive boulders get pushed and rolled along the seafloor by powerful wave forces. Meanwhile, suspension carries fine materials like silt and clay by whipping them up in turbulent water, creating that murky look you see in rough seas.
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2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Deposition and Weathering
Deposition happens when water and wind basically get too tired to carry their load any further. Marine deposition occurs when seawater drops its sediment, whilst Aeolian deposition happens when wind loses its carrying power.
This process kicks in when sediment load exceeds what water or wind can actually handle. Think of it like an overloaded shopping bag - eventually something's got to give! Sediment load increases during events like landslides, or when wind and water lose energy and slow right down.
Freeze-thaw weathering is nature's jackhammer, working on cliffs in areas where temperatures bounce above and below freezing. Water seeps into rock joints and cracks, then expands by about 9% when it freezes - imagine that pressure building up!
Remember: Weathering weakens cliffs first, making them much more vulnerable to erosion later - it's like softening them up for the knockout punch.
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