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Quiz yourself on River Processes and LandformsGet your flashcardsBuild my revision planTrack my progress⚖️ Comparing the Three Courses
| Feature | Upper Course | Middle Course | Lower Course |
|---|---|---|---|
| Valley shape | V-shaped, steep-sided, narrow | Wider V, valley floor developing | Wide, flat — U or flat-bottomed |
| Main erosion type | Vertical (downward) | Lateral (sideways) | Minimal — mainly deposition |
| Transport methods | Traction, saltation | Saltation, suspension | Suspension, solution |
| Channel shape | Irregular, rocky bed | Smoother, asymmetric at bends | Deep, smooth, very wide |
| Human land use | Moorland, sheep grazing, reservoirs, tourism (waterfalls) | Mixed farming, some settlement, recreation | Intensive agriculture, urban settlement, industry, flood risk management |
| River Tees example | Cross Fell → High Force | Barnard Castle area | Darlington → Middlesbrough |
Common Misconceptions Table
| What many students write | What is actually true |
|---|---|
| "Upper course rivers flow faster because the gradient is steeper" | Lower course rivers are typically faster — smoother bed = less friction = higher velocity despite lower gradient |
| "Erosion only happens in the upper course" | Lateral erosion is the dominant process in the middle course; erosion occurs throughout the river |
| "Meanders form where the river is straight" | Meanders form because an initial irregularity triggers a positive feedback loop of unequal erosion — they require no special conditions |
| "Ox-bow lakes form in the upper course" | Ox-bow lakes form in the middle and lower course, where meanders are well-developed |
| "Levées prevent flooding" | Natural levées can make flooding worse — they raise the river above the floodplain, so a levée breach causes sudden, deep flooding |
| "Abrasion and attrition are the same thing" | Abrasion = load eroding the riverbed; attrition = load particles eroding each other |
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