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14 Jan 2026

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2 pages

Geography National 5: Rivers - Meanders and Oxbow Lakes

Holly Carnson

@hollycarnson_eakb

Rivers change dramatically as they flow through their middle course,... Show more

The Middle course

D
Main Features
Meanders -the river starts to erode from side to side.
niver beach-nver moves slow on inside of bend, can

The Middle Course Features

Your river's personality completely shifts in the middle course - it slows down and starts carving elegant curves across the landscape. The main job here is transportation, moving sediment downstream rather than just cutting downwards like in the upper course.

Meanders are the star feature of this section. These S-shaped bends form because the river erodes from side to side rather than straight down. The land here is moderately sloping, giving the river room to wiggle about.

Two key features appear on every meander bend. The river beach forms on the inside bend where slow-moving water drops larger pebbles and sediment. Meanwhile, the river cliff develops on the outside bend where faster water undercuts the bank through erosion.

Quick Tip: Remember that fast water erodes $outside bend = river cliff$ whilst slow water deposits $inside bend = river beach$ . This pattern never changes!

The flatter valley floor makes this area perfect for human activities. Farming thrives here because the soil is fertile and the land is easier to work. Towns and villages pop up along these stretches, and recreational activities like fishing and camping become popular.

Meander and Oxbow Lake Formation

Understanding how meanders form is actually quite straightforward once you grasp the energy differences. On the outside bend, fast-flowing water packs more energy, leading to intense erosion through hydraulic action and abrasion. This creates the steep river cliff and deeper water.

The inside bend tells a completely different story. Here, slow-moving water lacks energy, so deposition dominates. Sediment gets dumped, forming the gently sloping river beach in shallow water. This continuous process of "erode outside, deposit inside" gradually creates the meander's distinctive shape.

Oxbow lakes form when meanders become too extreme for their own good. Continuous erosion narrows the "neck" of the meander until high flow periods allow the river to cut straight through, creating a new direct channel.

Remember: Oxbow lakes are temporary features - they'll eventually dry up and disappear from the landscape.

Once the river finds this shortcut, all the energy focuses on the new channel. The old meander gets cut off as deposition blocks both its entrance and exit. What's left behind is a curved oxbow lake that will gradually fill with sediment and vegetation over time.

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14 Jan 2026

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2 pages

Geography National 5: Rivers - Meanders and Oxbow Lakes

Holly Carnson

@hollycarnson_eakb

Rivers change dramatically as they flow through their middle course, transforming from fast-flowing mountain streams into meandering waterways. This is where rivers start to snake across the landscape, creating fascinating features like river beaches, cliffs, and oxbow lakes through the... Show more

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The Middle Course Features

Quick Tip: Remember that fast water erodes $outside bend = river cliff$ whilst slow water deposits $inside bend = river beach$ . This pattern never changes!

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Meander and Oxbow Lake Formation

Remember: Oxbow lakes are temporary features - they'll eventually dry up and disappear from the landscape.