river dicharge
- Created by: Libby Easden
- Created on: 03-03-13 15:25
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- River discharge factors:
- intensity and duration of the storm
- if both high = steep rising limb> exceeded infiltration capacity of soil
- antecedent rainfall
- heavy rain on saturated soil = steep rising limb
- snow
- when melted = ^ discharge
- porous soil type/ permeable rock type
- limestone- less steep graph
- impermeable rock type
- granite+ clay - rapid ^ in discharge
- size of drainage basin
- small basin = short lag time
- shape of drainage basin
- shorter lag time in round basin then elongated
- slope angle
- steep slope = steeper rising limb and shorter lag time
- temperature
- ^ temp = ^ evapotranspiration = reduced dicharge
- vegetation
- varies with season> summer = more leave> more interception > peak discharge lower
- land use
- water runs quiker of impermiable surfaces > caraven parks + land trampled by cattle = ^ peak discharge + decrease in lag time
- urbanisation
- main human impact. reduces lag time ^ peak discharge
- intensity and duration of the storm
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