River Regimes in different climate

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  • River Regimes in different climate
    • The Yukon, Alaska
      • polar in winter, warmer in summer
        • precipitation is frozen in winter, flow is low
        • summer - snowmelt causes flow to be higher
    • The Amazon
      • tropical climate - consistent temperature and precipitation
      • high biodiversity means high evapotranspiration
      • seasonality - consistent river flow - El Nino and La Nina may produce changes in rainfall which affect river discharge
      • deforestation- affects interception, infiltration and surface run off
      • dams can cause more discharge above the demand reduce flow below it
    • The Murray-Darling, Australia
      • sub-tropical
      • much of it is in a rain shadow - surrounded by mountains which collect rain and can cause long periods of drought
      • clear wet and dry seasons which changes flow of the river
        • El Nino brings less rain but La Nina brings wetter and colder conditions
      • water is used in the cities and for irrigation - natural flow altered for human access which had led to loss of habitat

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