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GCSE Geography · key term
A barrier built at right angles to the shore to trap sediment transported by longshore drift.
Used by AQA and Edexcel
Specification 3.1.3.2 · Paper 1
Revise: Coastal Management Strategies and Case StudyGroynes are barriers of wood, rock or steel built at right angles to the shore. They trap sand and shingle being transported by longshore drift. The trapped material builds a wider beach, which absorbs wave energy and helps reduce erosion.
Paper 2
A barrier built at right angles to the shoreline to trap sediment transported by longshore drift.
Distinguish groynes, which trap sediment moving along the coast, from sea walls and rock armour, which protect the shore directly.
Explain conflicting views by identifying who gains protection and who bears a cost. People living downdrift of groynes may have different interests from those behind them.
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Groynes are barriers, often made of wood or stone, built at right angles to the shoreline. They interrupt longshore drift, the movement of sediment along the beach. Material accumulates on the side from which sediment arrives, helping to build a wider beach.