Why are some coastlines vulnerable to erosion and flooding, and what threats do they face?
Key Idea 4.1 (Theme 4): vulnerable coastlines, the physical and human factors that make a coast vulnerable to erosion and flooding, the threat of coastal erosion and retreat (for example soft cliffs), and the increasing risk of coastal flooding from storm surges and sea-level rise.
A focused answer on Key Idea 4.1 for WJEC GCSE Geography Unit 1 (Theme 4): the physical and human factors that make a coast vulnerable, the threat of coastal erosion and cliff retreat, and the rising risk of coastal flooding from storm surges and sea-level rise.
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What this dot point is asking
This dot point covers Key Idea 4.1 of WJEC Unit 1 Theme 4 (the coastal option): vulnerable coastlines. You need the physical and human factors that make a coast vulnerable to erosion and flooding, the threat of coastal erosion and cliff retreat (e.g. soft cliffs), and the rising risk of coastal flooding from storm surges and sea-level rise.
What makes a coastline vulnerable
The threat of coastal erosion and retreat
The rising risk of coastal flooding
Try this
Q1. What is fetch? [Knowledge recall]
- Cue. The distance of open sea over which the wind blows; a longer fetch lets waves build up more energy, so they are more powerful and erosive when they reach the coast.
Q2. Explain why low-lying coasts are increasingly at risk of flooding. [Short explanation]
- Cue. Climate change is raising global sea levels as ice melts and warming water expands, while more frequent, intense storms bring higher storm surges, so low-lying land is flooded more often and more deeply, affecting growing coastal populations.
Exam-style practice questions
Practice questions written in the style of WJEC exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
WJEC Unit 1 (Theme 4)4 marksDescribe the factors that make a coastline vulnerable to erosion.Show worked answer →
A short data-response describe question. Reward described physical and human factors.
Physical factors. Weak rock such as soft clay or sand erodes quickly; a long fetch and frequent storms create powerful destructive waves; and exposed coasts facing the prevailing wind are attacked hardest.
Human factors. Building on cliff tops adds weight and removes vegetation, and structures such as groynes can starve a beach of sediment, leaving the cliff exposed.
Top marks. A mix of physical (rock, fetch, storms) and human (cliff-top development, sediment starvation) factors.
WJEC Unit 1 (Theme 4)6 marksExplain why the risk of coastal flooding is increasing.Show worked answer →
A short explain question (levels marking). Reward developed reasons linked to a rising risk.
Sea-level rise. Climate change is melting ice and expanding warming seawater, so global sea levels are rising, putting low-lying coasts and estuaries at greater risk.
Storms and people. More frequent and intense storms create higher storm surges, while more people and property are now located on vulnerable coasts, so the impact of any flood is greater.
Top band. Link sea-level rise, storm surges and increasing coastal development to a clearly rising flood risk.
Related dot points
- Key Idea 4.2 (Theme 4): managing coastal hazards, the use of hard engineering (sea walls, groynes, rock armour, gabions) and soft engineering (beach nourishment, managed retreat, dune regeneration), and the costs, benefits and sustainability of different coastal management strategies.
A focused answer on Key Idea 4.2 for WJEC GCSE Geography Unit 1 (Theme 4): hard engineering (sea walls, groynes, rock armour, gabions) and soft engineering (beach nourishment, managed retreat, dune regeneration), and the costs, benefits and sustainability of coastal management.
- Key Idea 1.2 (coasts): the processes that operate along a coastline (weathering, mass movement, erosion, transportation and deposition), constructive and destructive waves and longshore drift, and the formation of distinctive coastal landforms of erosion (headlands, bays, caves, arches, stacks) and deposition (beaches, spits and bars).
A focused answer on coastal landscapes for WJEC GCSE Geography Unit 1 (Key Idea 1.2): weathering, mass movement, erosion, transportation and deposition, constructive and destructive waves, longshore drift, and the formation of erosional landforms and depositional landforms.
- Key Idea 3.2 (Theme 3): vulnerability and hazard reduction, why people live in tectonically active areas, why the impacts of earthquakes and volcanoes differ between richer and poorer countries, and how hazards can be reduced through prediction, protection (building design) and preparation (planning and education).
A focused answer on Key Idea 3.2 for WJEC GCSE Geography Unit 1 (Theme 3): why people live in hazardous areas, why earthquake and volcano impacts differ between richer and poorer countries, and how risks are reduced through prediction, protection and preparation.
- Key Idea 1.3: the drainage basins of Wales and the UK, the drainage basin as an open system (inputs, stores, flows and outputs), the storm hydrograph and the factors affecting it, the physical and human causes of river flooding, and the hard and soft engineering used to manage flooding.
A focused answer on Key Idea 1.3 for WJEC GCSE Geography Unit 1: the drainage basin as an open system, the storm hydrograph and the factors affecting it, the physical and human causes of river flooding, and the hard and soft engineering used to manage it.
- Key Idea 5.1: climate change during the Quaternary period, the evidence for natural climate change (ice cores, tree rings, pollen and historical records), the natural causes of climate change (orbital changes, sunspots, volcanic activity), and the contribution and consequences of recent human-induced (anthropogenic) warming.
A focused answer on Key Idea 5.1 for WJEC GCSE Geography Unit 2: climate change during the Quaternary, the evidence (ice cores, tree rings, pollen), the natural causes (orbital changes, sunspots, volcanoes), and the contribution and consequences of recent human-induced warming.
Sources & how we know this
- WJEC GCSE Geography (Wales) specification (3110) — WJEC (2019)