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Fluvial Patterns And Landforms And Human Interaction (River Drainage…
Fluvial Patterns And Landforms And Human Interaction
Impact Of Canalisation
Canals used as waterways.
Built also for irrigation purposes, e.g. Aral Sea, Central Asia.
River Drainage Patterns:
Radial
Trellis
Dendritic
Deranged
Building Of Canals Led To Shrinkage Of Aral Sea Causing:
Pollution
Climate Change
Increased unemployment
Infertile land
Flood Control Measures:
Failed in 2005
80% of New Orleans flooded
Artificial levees constructed to withstand increased volume of water in river, e.g. Mississippi River
Human Activities Can Impact On Operation Of Surface Processes
HEP Dams
Used to control flow or river water
Use to generate electricity, e.g. Ardnacrusha, Co. Clare
Positive Impacts
Lake behind da can be used for recreation and/ or aquaculture, e.g. Three Gorges Dam, China
Control Flooding
Supply of water
Generation of electricity
Negative Impacts
Possible need to relocate people
Lack of naturally occurring alluvial deposits downriver
May need to use artificial fertilisers -> expensive and fear of pollution