6.9 Hydroelectricity
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7 Terms
how hydroelectricity produces energy
kinetic energy of moving water, spins a turbine (mechanical energy), turbine powers generator
largest renewable source of electricity globally
hydroelectricity
Biggest hydroelectricity producers
China, Brazil, US
water impoundments (dams)
dam built in a river creates a large artificial lake behind the dam (reservoir)
Drawbacks
reservoir floods habitats behind dam (forest/wetlands > gone; river becomes a lake), env. impacts = FF combustion during contruction, inc. evap, methane release due to anaerobic decomp. of org. matter in reservoir; econ. impacts = human homes and businesses relocated, sediment build up
fish ladders
cement “steps” or series of pools that migratory fish like salmon can use to continue migration upstream, around or over dams
benefits of hydrodams
no GHG emissions when producing electricity (initial construction does require cement and machines that emit GHGs), allows for control of downstream season flooding
Note 
Flashcards (36)