What landforms and features are associated with the middle course of a river?
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Transcript of 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.
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What is the point where two rivers meet called?Confluence
Mouth
Source
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What is the name of the smaller river that joins the main river?Flood plain
Tributary
Mouth
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What is the starting point of the river called?Source
Drainage basin
Channel
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What is the geographical name for rain, hail, sleet and snow?Percolation
Infiltration
Precipitation
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What do we call water turning into a gasPrecipitation
Evaporation
Condensation
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What is a bend in the river called?Meander
Watershed
Channel
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What is the name for the area of land which is drained by a river?Mouth
Drainage Basin
Confluence
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What is the end of the river called?Source
Tributary
Mouth
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What do we call the circumference of a drainage basin?Watershed
Edge
Groundwater
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Learning OutcomesStudents 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
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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.
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A meander along the River Tees
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A meander
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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 toInside or outside?
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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.
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What does this look like as a cross section?
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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 toInside or outside?
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The future?