Physical Landscapes in the UKTopic Summary
Topic Summary: River Processes and Landscapes
Part of River Processes and Landforms — GCSE Geography
This topic summary covers Topic Summary: River Processes and Landscapes within River Processes and Landforms for GCSE Geography. Revise River Processes and Landforms in Physical Landscapes in the UK for GCSE Geography with 15 exam-style questions and 22 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 18 of 18 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 18 of 18
Practice
15 questions
Recall
22 flashcards
Topic Summary: River Processes and Landscapes
Key Terms
- Hydraulic action: Water pressure shattering rock
- Abrasion: Load scraping bed/banks
- Attrition: Load particles wearing each other
- Corrosion: Acid dissolving soluble rock
- Traction: Boulders rolling along bed
- Saltation: Pebbles bouncing along bed
- Suspension: Fine silt carried in water
- Meander: S-shaped river bend
- Ox-bow lake: Isolated former meander loop
- Floodplain: Flat valley floor of alluvium
- Levée: Natural embankment beside channel
- Alluvium: Fertile silt deposited by floods
- Discharge: Volume of water per second (m³/s)
- Competence: Max particle size river can carry
Key Processes
- Upper course: Vertical erosion → V-valley + waterfalls
- Waterfall formation: Hard rock over soft → differential erosion → undercutting → collapse → retreat → gorge
- Meander formation: Deflection → faster outside → lateral erosion → river cliff; helical flow → deposition inside → point bar; positive feedback amplifies bend
- Ox-bow lake: Meander neck narrows → flood cuts through → deposition seals old loop
- Floodplain: Lateral meander migration + repeated alluvium deposition during floods
- Levée: Coarse material deposited beside channel during floods → builds embankment
- Bradshaw Model: Discharge, velocity, width, depth all increase downstream; sediment size decreases
Named UK Example
- River Tees — 137km, Cross Fell (893m) to Teesmouth
- High Force: 21m waterfall, Whin Sill dolerite over limestone/shale, gorge 700m long
- Low Force: 7m waterfall, 1.5km downstream — younger stage of same process
- Whin Sill: Hard dolerite — most resistant rock in North Pennines
- Teesside floodplain: Wide alluvial plain, historic steel/chemical industry on flat land
- River Great Ouse, Cambridgeshire: Ox-bow lakes and meander scars visible in aerial photography
- River Severn: Source at Plynlimon (752m), mouth at Gloucester — textbook upper to lower course transition
Must-Know Facts
- Lower course rivers are typically faster than upper course — lower friction despite lower gradient
- Velocity drop = deposition (Hjulström Curve principle)
- Meander: outside = erosion (river cliff); inside = deposition (point bar); helical flow links them
- Mnemonic: RSVP (Rolling, Skipping, Very fine suspension, Pure solution)
- Mnemonic: MOAT (Material smashing, Opening cracks, Abrasion, Taking dissolved rock)
- Outside meander = faster flow = erosion = river cliff; INSIDE = slower flow = deposition = point bar
- Ox-bow lake → meander scar → marsh → dry land over time
- High Force = largest waterfall in England by volume
- Discharge increases downstream (tributaries add water)
- Sediment gets smaller and rounder downstream (attrition)