Meanders Lesson 8 – page 7.

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Presentation transcript:

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. This causes undercutting of the bank. This causes a steep river cliff.

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.

River Cliff Point Bar

River Taff - Cilfynydd River Cliff Point Bar Water Works

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

Meander Cross-Section

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.

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.

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