Good Learning Co.
SavannahYear 8
← Geography
GeographyGCSE UK river landscapes30 min★★★ difficulty

River processes and landforms down the long profile

One river, three stages, a predictable set of landforms. Learn the sequence and you can explain any labelled diagram the exam prints.

Lesson overview

What you'll learn in this lesson

Explain fluvial processes, landforms along the long profile, flood risk and management strategies.

Key learning points

  • • Processes
  • • Upper course landforms
  • • Middle and lower course landforms
  • • Hydrographs and flood risk

This lesson at a glance

  • 30 minutes
  • 16 parts to scroll through
  • 4 quick checks
  • Marked quiz at the end
  • Gentle pace: short sittings with pauses

Words to know

fluvialprocesseslandformsprofilemanagement

Scroll down — the lesson carries on below

Part 1 of 16 · Discover6%
1

Watch & discover

Part 1 of 16

Watch first

River processes and landforms down the long profile

An English teaching video on this topic from Hums Mums. Watch it, then scroll down for the lesson.

In a nutshell

Explain fluvial processes, landforms along the long profile, flood risk and management strategies.

2

Learning cycle

Part 2 of 16

Learning cycle 1 of 2

Part 1 · Processes

A short piece of teaching, then a check to make sure it has landed.

3

Explore the idea

Part 3 of 16

Learn

Processes

Erosion works by hydraulic action, abrasion, attrition and solution; transport by traction, saltation, suspension and solution; deposition occurs when velocity falls. Vertical erosion dominates upstream, lateral erosion downstream — the single most useful sentence in this unit.

4

Explore the idea

Part 4 of 16

Learn

Upper course landforms

Interlocking spurs, V-shaped valleys, waterfalls and gorges. A waterfall retreats upstream as soft rock is undercut beneath a hard cap, the overhang collapses into a plunge pool, and the repeated process leaves a gorge behind it.

5

Quick check

Part 5 of 16

Quick check

Which process dominates in the upper course?

6

Quick check

Part 6 of 16

Quick check

What forms a gorge below a waterfall?

7

Reset break

Part 7 of 16

Pause

That's sitting 1 of 2 done

Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.

Stop here for now
8

Learning cycle

Part 8 of 16

Learning cycle 2 of 2

Part 2 · Middle and lower course landforms

A short piece of teaching, then a check to make sure it has landed.

9

Explore the idea

Part 9 of 16

Learn

Middle and lower course landforms

Meanders form where flow is fastest on the outside bend, eroding a river cliff, while slower water on the inside deposits a slip-off slope. Continued erosion narrows the neck until a flood cuts through, leaving an oxbow lake. Floodplains and levées are built by repeated overbank deposition, coarsest material dropping first at the channel edge.

10

Explore the idea

Part 10 of 16

Learn

Hydrographs and flood risk

Lag time is the gap between peak rainfall and peak discharge. Impermeable geology, steep slopes, saturated or frozen ground, deforestation and urbanisation all shorten lag time and raise the peak — the standard structure for any flood-risk answer.

11

Quick check

Part 11 of 16

Quick check

Which factor shortens lag time?

12

Quick check

Part 12 of 16

Quick check

Why is the coarsest material found on levées?

13

Explore the idea

Part 13 of 16

Worked example

Model answer: 'Explain the formation of an oxbow lake' (4 marks)

On a meander, the fastest flow on the outside of the bend erodes the bank by hydraulic action and abrasion, forming a river cliff, while reduced velocity on the inside deposits sediment as a slip-off slope. Over time this erosion narrows the neck of land between two bends. During a flood the river has enough energy to cut straight across the neck, taking the shorter route. Deposition then seals the ends of the old meander, leaving a crescent-shaped oxbow lake cut off from the main channel.

14

Challenge round

Part 14 of 16

Game · Sort it

Which of these are true?

Drag each card into the right column. Tap a card first if dragging is fiddly.

True

Not true

15

Mastery quiz

Part 15 of 16

Marked quiz

End of lesson quiz: River processes and landforms down the long profile

4 questions, marked with the reasoning shown. No timer.

  1. 1. Which process dominates in the upper course?

  2. 2. What forms a gorge below a waterfall?

  3. 3. Which factor shortens lag time?

  4. 4. Why is the coarsest material found on levées?

16

Lesson round-up

Part 16 of 16

Lesson round-up

Ready when you are

Quiz score

Not sat

Games

Not played

Points this lesson

0

Best run

0 in a row

Luna: 0 out of 4 on the practice checks. Only if you feel up to it — one more?

Ask Luna

Do the work

Your written work for this lesson

This is the part you'd do in your book at school. Pick the pieces below, write here or on paper, and photograph anything you draw or work out.

Case study

Flooding on the River Calder

The town of Harbrook sits where a steep valley opens onto a flat floodplain. In December 2015, 120 mm of rain fell in 36 hours onto ground that was already saturated. The river rose 2.4 m in five hours, and 380 homes and 54 businesses flooded. Two roads and the railway closed for eleven days.

Geographers pointed to physical causes — steep slopes, impermeable rock, heavy rainfall — and human causes: moorland drained upstream, new housing built on the floodplain, and drains designed for smaller storms.

Since then the town has planted 40 hectares of woodland upstream, built leaky dams in small streams, and raised flood walls to 1.8 m. In the storm of 2020 the peak river level was 0.3 m lower and 40 homes flooded, not 380.

Written for Good Learning Co.

Reading questions

  1. List two physical and two human causes of the 2015 flood.
  2. Explain how planting woodland upstream lowers the river's peak level.
  3. Using the figures, judge how successful the scheme has been. Quote data in your answer.

  • Case study notes

    Writing

    Write the place, the facts and the figures from this lesson so you can revise them later.

    Half a page

  • Explain answer

    Writing

    Answer in full sentences, giving causes and effects. Use one figure or place name as evidence.

    8–10 sentences

  • Map or sketch

    Diagram

    Draw the map, cross-section or field sketch with a key, title and labels, then photograph it.

    1 map with a key

  • Data work

    Working out

    Plot your figures as a graph on paper and write one sentence about the pattern.

    1 graph + 1 sentence

Saved as you type.

Part 1 of 16 · Watch & discover

Good Learning Co. — personalised UK curriculum learning, built around what each learner loves.