rivers
- Created by: andiemurraysorfleet
- Created on: 17-05-15 21:33
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- rivers case study Bangladesh and missisippi
- mass movement
- soil creep (soil particles move down the slope due to gravity)
- slumping (the river erodes the bottom of the valley making a steeper slope
- rock fall (rocks at the top of the valley break off and move down the slope)
- upper river landforms
- interlocking spurs
- they are are ridges in the valley
- the ridges interlock
- waterfalls
- hard rock above soft rock
- the soft rock i easily eroded by hydraulic action
- a plunge pool is formed by hydraulic action and abrasion
- overhanging hard rock eventually collapses
- interlocking spurs
- middle river landforms
- meanders
- caused by hydraulic action and abrasion
- the river is eroded laterally and forms large bends
- the inside bend has the slowest flow and the river deposits materiel here
- ox bow lakes
- the inside bend of the meaner has materiel deposited
- eventually the neck of the meander bends will join together
- that part of the river is no longer a meander and a crescent shaped feature is left behind
- meanders
- lower river landforms
- flood plains
- in the lower course the river carries lots of sediment
- when the river floods the water spills over the surrounding area and deposits sediment
- levees
- a river floods and the sediment is deposited on the flood plain
- the heavier materiel is dropped near the river channel due to loss of energy
- after a number of floods levees are leftover
- flood plains
- why do rivers flood
- human
- deforistation
- climate change
- urbanisation
- phyisical
- rainfall intensity
- geology
- snow melt
- drainage basin
- human
- Mississippi flooding 2011 USA
- causes
- heavy rainfall
- impermeable surfaces
- impacts
- outbreak of disease
- homes flooded
- nutrients washed away in soil
- farmland destroyed
- hard engineering management
- levees built
- river straightening
- flood-ways created
- soft engineering management
- restoration of upland river to act as a sponge
- government funding to farmers who use land as wildlife conservation
- causes
- reducing impacts of flooding
- planning
- areas at risk are used as parks and leisure activities
- prediction
- environment agency monitors rivers
- prevention
- the environment agency says to raise height of electrical sockets , use tiles instead of carpets , install heating systems on upper floors.
- education
- the environment agency gives out leaflets and advertising , posts info on there website, telephone helplines and organises flood drills
- planning
- mass movement
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