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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
- estuary, surface water salinity, fw Surface, · River flow, fw Surface water