123 4 7 10 56 89 1112. What landforms and features are associated with the middle course of a river?...
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Transcript of 123 4 7 10 56 89 1112. What landforms and features are associated with the middle course of a river?...
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What landforms and features are associated with the middle course of a river?
LO: To investigate how meanders and ox-bow lakes form.
What is the point where two rivers meet called?
–Confluence
–Mouth
–Source
What is the name of the smaller river that joins the main river?
–Flood plain
–Tributary
–Mouth
What is the starting point of the river called?
–Source
–Drainage basin
–Channel
What is the geographical name for rain, hail, sleet and snow?
–Percolation
–Infiltration
–Precipitation
What do we call water turning into a gas
–Precipitation
–Evaporation
–Condensation
What is a bend in the river called?
–Meander
–Watershed
–Channel
What is the name for the area of land which is drained by a river?
–Mouth
–Drainage Basin
–Confluence
What is the end of the river called?
–Source
–Tributary
–Mouth
What do we call the circumference of a drainage basin?
–Watershed
–Edge
–Groundwater
Learning Outcomes
• Students MUST be able to describe what a meander is and identify the processes which have produced it.
• Students SHOULD be able to explain the formation.• Students COULD suggest how meanders turn into Ox
Bow lakes.
http://www.bbc.co.uk/learningzone/clips/rivers-meanders/403.html
What is a meander?
Meanders are large bends in the course of a river.
They begin to appear as the valley floor becomes flatter and lateral erosion become more significant than vertical erosion.
A meander along the River Tees
A meander
Water flows fastest.
Water flows slowest.
Deposition takes place.
Lateral erosion (corrasion) takes place.
Sand and shingle builds up to form a slip off slope.
Undercutting takes place and forms a river cliff.
River is deeper.
River is shallower.
Bank will eventually collapse.
Has less friction and therefore more energy.
Most likely to…Inside or outside?
How do Ox-bow lakes form?
The abandoned part of a meander after a river has straightened its course by eroding through the neck of the meander.
What does this look like as a cross section?
I: Water flows fastest.
A: Water flows slowest.
C: Deposition takes place.
J: Lateral erosion (corrasion) takes place.
G: Sand and shingle builds up to form a slip off slope.
H: Undercutting takes place and forms a river cliff.
D: River is deeper.
E: River is shallower. F: Bank will eventually
collapse.
B: Has less friction and therefore more energy.
Most likely to…
Inside or outside?
The future?
