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Meanders

Meanders. Lesson 8 – page 7. Lesson Aims. To learn what a meander is. To learn how meanders form. To learn how an ox-bow lake forms. Key Skill = Communication. Water flows faster on the outside of bends. Abrasion and hydraulic action causes erosion.

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Meanders

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  1. Meanders Lesson 8 – page 7

  2. Lesson Aims • To learn what a meander is. • To learn how meanders form. • To learn how an ox-bow lake forms. • Key Skill = Communication

  3. Water flows faster on the outside of bends. • Abrasion and hydraulic action causes erosion. • This causes undercutting of the bank. • This causes a steep river cliff.

  4. Water flows slower on the inside of bends. • The river deposits its load. • This results in a gentle bank of sand and gravel. • This is called a point bar.

  5. River Cliff Point Bar

  6. River Taff - Cilfynydd River Cliff Point Bar Water Works

  7. Activity • Draw a labelled sketch to show a meander. • How does a river cliff form? • How does a point bar form?

  8. Meander Cross-Section

  9. Activity • Draw a labelled sketch to show a meander cross-section. • Label where it will be deeper and why. • Label where it will be shallower and why.

  10. Ox-bow Lakes • Meanders become more extreme. • This creates a narrow neck of land. • Fast current erodes the neck cutting off the meander. • Meander is sealed off by deposition to create an ox-bow lake.

  11. Homework Activity • Draw an annotated sketch to show how sn ox-bow lake forms.

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