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Po River Delta and Discharge

Po River Delta and Discharge. Estuarine waters. Front. Coastal waters. Wind driven Estuarine circulation Tidal mixing. Physical Structure and Functioning of Estuaries 1. Freshwater runoff a. runoff greater than tides  strongly stratified b. tides greater than runoff

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Po River Delta and Discharge

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  1. Po River Delta and Discharge

  2. Estuarine waters Front Coastal waters

  3. Wind driven Estuarine circulation Tidal mixing

  4. Physical Structure and Functioning of Estuaries 1. Freshwater runoff a. runoff greater than tides  strongly stratified b. tides greater than runoff  weakly stratified The balance may change seasonally, as shown in the figure. Increased seasonal discharge FEB APR MAY

  5. 2. Interactions between buoyancy and mixing Salt-wedge Partially-mixed Vertically mixed Fjord

  6. Flooding tide salty Salt Wedge salty Flooding tide

  7. Incoming tide

  8. 6-8m 4-6m 2-4m Salinity values at various depths below the surface (higher Salinity at depth) 0-2m

  9. 4. Coriolis Force

  10. Behavioral component to ingress/egress to/from estuaries

  11. Other biological aspects… From Houde and North (2000)

  12. Salinity lines (TSS) total suspended sediment maximum occurs at the “nose” of the salinity intrusion

  13. Estuarine Turbidity Maximum (ETM) (Houde and North, 2000) • 96% striped bass eggs and 59% of white perch larvae located up-estuary of front • ETM is an important nursery area as these species use transport and retention within ETM • Retention within ETM may place larvae in a zone of increased zooplankton biomass and production

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