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Unformatted text preview: Estuaries o Estuary- an inlet of the sea reaching into a river valley as far as the upper limit of tidal influence o Mixing zones of dense sw and less dense fw Described by mode of formation or by circulation features 4 principle types of circulation Salt wedge Well-mixed Partially mixed Fjords Mixing depends on : Strength of tides Velocity of fw influx Topography Can be described by ration of R/Tm o Salt wedge : R/Tm>>>1 River flow is large surface flow Tidal range is low and there is a small surface flux of sw Result: Stratification: water is salty at depth with a sharp halocline Lower layer of sw in entrained by fw Gradual mixing Surface water salinity only increases toward ocean Found at large rivers o Partially mixed R/Tm~1 River flow is moderate Tidal range is moderate and there is gradual mixing of sw and fw...
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- Spring '08