Erosion
Terms
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- erosion
- when rocks are dislodged or dissolved from the earth's surface
- erosion takes place under three categories
-
hydrolic action
abrasion
solution/carbonation - hydrolic action
- erosion by water
- abrasion
- material carried in running water can scrape the bed and bank
- solution/carbonation
- the disolving of rocks
- Amount of sediment dislodged
- the more discharge the greater amount of sediment
- discharge is the
- amount of water in a stream at a specific point at a given time
- discharge is measured by
- cfs or cms
- discharge measures the
- volume of rivers and streams
- the greater the sediment load
- the greater ability that water has to erode
- the greater the velocity
- the greater the ability to erode
- the greater the friction caused by surface roughness
- the greater the amount of turbulance in the water
- increased turbulance
- increases the waters abiility to erode
- the steeper the slope
- the easier the water can erode materials
- variation in sediment load, velocity, friction, resistance, and slope
- varies significantly within short distances
- the greater the resistance of rocks
- the harder they are to erode
- most streams erode both
- vertically and horizontally
- steeper gradients across space lead to
- more erosion
- gentle gradients cause
- hosizontal erosion
- most streams atempt to reach
- base level or sea level (untrue in many cases
- rivers and streams are in
- dynamic equalibrium with their environments
- rivers reach a condition
- where they appear not to change
- rivers remain to appear to stay the same until their
- environments change and they change to match it