Upland and lowland Britain

The UK's physical landscape can be split into two broad zones:

• Uplands — mostly in the north and west (e.g. the Scottish Highlands, the Lake District, Snowdonia, the Pennines). They are made of older, harder rock and have high, rugged relief.
• Lowlands — mostly in the south and east (e.g. the Fens, the Thames basin). They are made of younger, softer rock with gentle, low relief.

Major rivers include the Severn and the Thames (the UK's two longest), plus the Trent, Great Ouse and Tyne. Rivers begin their journey in the uplands and flow down to the sea.

Key idea: a rough line drawn from the mouth of the Tees to the mouth of the Exe separates upland Britain (to the north-west) from lowland Britain (to the south-east).

The long profile & changing cross profile

A river's long profile shows its slope from source (start) to mouth (sea). The cross profile shows the shape of the valley and channel across it. Both change along the three courses:

Watch out: the river speeds up as it moves downstream, even though the land is flatter — the channel is smoother and deeper, so there is less friction.

Erosion, transport and deposition

Rivers erode the channel by four processes:

• Hydraulic action — the force of the water forcing into cracks in the banks and bed.
• Abrasion — the load carried by the river scrapes and wears away the bed and banks.
• Attrition — the load knocks together, becoming smaller and rounder over time.
• Solution — slightly acidic water dissolves soluble rock such as limestone.

Erosion is vertical (downwards, deepening the valley) in the upper course, and lateral (sideways, widening the valley) in the middle and lower course.

Transport happens by traction, saltation, suspension and solution. Deposition occurs when the river loses energy — e.g. on the inside of a meander, at the mouth, or during a flood.

Which direction of erosion?

Match the transport process to its meaning

Tap a process on the left, then tap its correct description on the right.

Interlocking spurs, waterfalls & gorges

In the upper course, the river winds around bands of harder rock, leaving interlocking spurs jutting into the valley. Where a band of hard rock lies over soft rock, a waterfall forms:

How a gorge forms

Meanders and ox-bow lakes

In the middle and lower course the river swings in bends called meanders. Water flows fastest on the outside of the bend, eroding a steep river cliff; it flows slowest on the inside, depositing a gentle slip-off slope:

Your turn — ox-bow lakes

Levées, floodplains & estuaries

The lower course is dominated by deposition:

• Floodplain — the wide, flat valley floor. When the river floods, it deposits fine sediment (alluvium) across it, building up fertile land.
• Levées — natural raised banks. As a flood overflows, the heaviest material is dropped first right beside the channel, building up ridges over many floods.
• Estuary — where the river meets the sea. In this tidal zone, mud is deposited to form mudflats and salt marsh.

Key idea: the lower course landforms are all built by deposition, because the river carries a large load but repeatedly loses energy on the flat land.

Managing river floods

Floods are managed with hard and soft engineering:

• Hard — dams & reservoirs store water; channel straightening speeds water through; embankments raise the banks; flood relief channels divert extra water.
• Soft — flood warnings, floodplain zoning (controlling what is built where), planting trees (afforestation) to intercept rain, and river restoration to slow the flow naturally.

Costs & benefits: hard engineering is effective but expensive and can shift the flood risk downstream; soft engineering is cheaper and more sustainable but may not protect against the biggest floods.

Hard or soft engineering?

Tap the correct type of engineering for each management strategy.

Case study: the Boscastle flood, 2004

On 16 August 2004, the Cornish village of Boscastle was hit by a sudden flash flood after intense rainfall on the steep upland catchment.

• Causes: around 200 mm of rain fell in a few hours; the steep, saturated valley funnelled two rivers together, and the water surged through the narrow village.
• Effects: dozens of cars were swept out to sea and buildings were badly damaged, but — thanks to helicopter rescues — no lives were lost.
• Management since: the channel was widened and deepened, a lower car park was raised, and the bridge was rebuilt with a bigger arch to let flood water through.

Exam tip: a good case-study answer names the place and date, gives facts/figures (e.g. ~200 mm rain, 2004), and links causes → effects → responses.

Constructive vs destructive waves

Now we move to the coast. Two kinds of wave shape it in opposite ways:

Misconception: the constructive wave is the one that builds beaches (its swash is stronger than its backwash). Don't assume big, dramatic waves build up the coast — the tall destructive ones tear it down.

Weathering, mass movement & erosion

Weathering breaks rock down in place — e.g. freeze–thaw (mechanical) and carbonation (chemical). Mass movement then shifts loose material downslope under gravity — e.g. sliding and slumping (common in wet clay cliffs).

Moving waves erode the coast by four marine processes:

• Hydraulic action — the force of water and compressed air pounding into cracks.
• Abrasion — waves fling pebbles and sand against the cliff, wearing it away.
• Attrition — rock fragments knock together, becoming smaller and rounder.
• Solution — slightly acidic seawater dissolves soluble rock such as limestone.

Headlands, and cave → arch → stack → stump

Where bands of hard and soft rock meet the coast, soft rock erodes faster into bays, leaving hard rock as jutting headlands. On a headland, erosion attacks lines of weakness in a famous sequence:

Getting the order right

Cliffs and wave-cut platforms

Where the sea attacks a cliff, it erodes a wave-cut notch at the base (between high and low tide). As the notch deepens, the rock above is left unsupported and collapses, so the cliff retreats inland.

Longshore drift, beaches, spits & bars

The sea moves eroded material along the coast by longshore drift: waves hit the beach at an angle, so swash carries sediment up diagonally, while backwash drags it straight back down — a zig-zag along the shore.

Your turn — spit formation

River landform or coastal landform?

Tap a landform, then tap the box it belongs in.

Managing the coast

Coasts are managed to reduce erosion and flooding. Two broad approaches:

• Hard engineering — sea walls reflect waves; groynes trap sediment moved by longshore drift; rock armour (rip-rap) and gabions absorb wave energy.
• Soft engineering — beach nourishment adds sand; dune regeneration replants marram grass; managed retreat lets low-value land flood or erode.

Misconception: managed retreat is a deliberate decision to stop defending a stretch of coast and let it flood/erode naturally — it is a chosen strategy, not a failure.

Choosing a defence

Case study: the Holderness Coast, UK

The Holderness Coast in East Yorkshire is one of the fastest-eroding coastlines in Europe, retreating on average about 1.5–2 metres every year.

• Why so fast? The cliffs are made of soft boulder clay (glacial till), which slumps easily when saturated. Powerful destructive waves have a long North Sea fetch.
• Impacts: around 29 villages have been lost to the sea since Roman times; farmland, homes and roads continue to be lost.
• Management: the town of Mappleton is protected by two rock groynes and rock armour (built 1991), which trap sediment and shield the cliff.
• Conflict: the groynes trap sediment, so the coast down-drift (e.g. Great Cowden) is starved of beach material and erodes even faster — a source of conflict between residents.

Exam tip: a good case-study answer names the place, gives facts/figures (e.g. ~2 m/yr, 29 lost villages, Mappleton groynes 1991) and explains a conflict between different users of the coast.

Understanding the case study

The key ideas to know

You've covered the AQA Physical Landscapes in the UK unit — both rivers and coasts. Press Finish to see your score.