geography- water on the land- river landforms- 3 courses
- Created by: zhzstudent
- Created on: 08-02-14 14:35
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- Water on the Land
- river landforms- middle course
- characteristics
- less steep gradient
- lateral erosion=dominant
- use up extra energy= meander
- erosion on ouside meander bend= remove interlocking spurs ends
- wider valley
- landform
- meander
- cross section
- outer bound
- undercutting- abrasion
- river cliff
- deep water , fastest flow
- river cliff
- undercutting- abrasion
- inner bound
- deposition
- slip off slope
- shallow, slack water
- slip off slope
- deposition
- outer bound
- cross section
- meander
- characteristics
- river landforms- upper course
- characteristics
- v-shaped valley
- inter-locking spurs
- high water velocity
- narrow, sahllow channel
- water falls
- process
- bands of different resistant rocks
- soft rock eroded (abrasion)- undercutting created
- hard rock hang over- cap rock
- gravity pull- hard rock collapse
- water +loose rock erode =deep plunge pool
- gravity pull- hard rock collapse
- hard rock hang over- cap rock
- soft rock eroded (abrasion)- undercutting created
- bands of different resistant rocks
- undercutting collapsing
- retreat upstream
- steep sided gorge
- retreat upstream
- process
- characteristics
- river landforms- lower course
- characteristics
- wider deeper channel
- flow through flood plain
- deposition =dominant process
- reasons
- large load
- reduced velocity- inner meander bend
- obstruction= bridge
- water volume reduction
- reasons
- river landforms
- ox-bow lake
- wider meander
- lateral erosion- meander migration
- deposition=change position
- erosion narrows meander neck
- flood= neck brocken through
- straight channel
- ox-bow lake formed
- dried=meander scar
- ox-bow lake formed
- straight channel
- flood= neck brocken through
- erosion narrows meander neck
- deposition=change position
- lateral erosion- meander migration
- wider meander
- delta
- enter sea / lake
- velocity reuce
- deposition occurs
- if blocked= find new route
- form distributaries
- material build up and outwards
- current cannot carry them away/ tideless area
- if blocked= find new route
- deposition occurs
- velocity reuce
- enter sea / lake
- levees
- river transport material
- river overflow- water cover flood plain
- cover large area= loses speed
- river deposit heavy material- coarse material
- levee created=natural embankment
- lighter,finer silt travel across flood plain
- levee created=natural embankment
- river deposit heavy material- coarse material
- cover large area= loses speed
- river overflow- water cover flood plain
- river transport material
- ox-bow lake
- characteristics
- river landforms- middle course
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