GEOG 2530H Lecture Notes - Lecture 5: Coastal Erosion, Organic Matter, Greenhouse Gas
13 Feb 2019
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Lecture 5: dams and diversions: not everywhere of whenever we need it, sometimes we have enough water supply for a community but not available all year, increase public water supply last longer. Improves food production: controls flooding, hydropower, tourism and recreation, navigation, more than of all rivers have a damn, lots of benefits but some negatives as well. Improvement of tech leads to a great impact. Fragmentation: remote/arctic have less altered areas, possibly due to tundra being pretty flat. Irrigation is the highest usage: dam usage depends on water demands. Effects of dams on stream flows: reduced stream flow after snowmelt, organisms need to adapt to flow alteration. Water quality: additional pollution inputs to reservoirs concentration instead of flooding, mercury release from sediment. Ecological impacts: aquatic, flow alterations, for plants, animals, blocking migration for fish, change in timing and delivery and magnitude peaks, flood act as biological triggers for migration, changes in temperature.
