Eduqas A-Level Geography A110QS
Coastal LandscapesLandscape
Glaciated LandscapesLandscape
Changing Places
Water and Carbon Cycles
Global Migration
Global Governance of the Oceans
Tectonic Hazards
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
Geographical Skills
Coastal Landscapes
Beaches, spits and bars
- 2 things to know
- Component 1 Section A
Overview
Typical profile of a shingle beach, difference between the berm and the runnel on a beach and formation of a spit.
What you need to know
Answer each one before you reveal it.
Why is a sand beach much gentler in gradient?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe the typical profile of a shingle beach.
Model answer
A shingle beach is steep, often at 10° to 20°, because water drains rapidly through the coarse material. Weak backwash leaves the sediment high on the profile.
- 2
Why is a sand beach much gentler in gradient?
Model answer
Sand packs tightly and water cannot percolate through it easily. Backwash therefore stays strong and pulls material back down, producing a slope of about 2° to 5°.
- 3
What is the difference between the berm and the runnel on a beach?
Model answer
A berm is a ridge of sediment marking the limit of the swash at high tide. A runnel is a water-filled trough on the lower beach between ridges.
- 4
Define a spit.
Model answer
A spit is a long, narrow ridge of sand or shingle attached to the land at one end. The free end projects into the sea or across an estuary mouth.
- 5
Explain the formation of a spit.
Model answer
Longshore drift carries sediment along the coast until the shoreline changes direction abruptly. Sediment continues in its original line into the deeper, calmer water and is deposited, building a ridge outward from the land.
- 6
Why does the end of a spit often curve landward?
Model answer
Waves from a second, less common direction refract around the spit end. The change in wave approach turns the tip inland to form a recurved hook.
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