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Burrard Inlet: The Extended Sill of a Fjord

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as presented by Susan Allen at #BISS2017 (Burrard Inlet Science Symposium)

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Burrard Inlet: The Extended Sill of a Fjord

  1. 1. Burrard Inlet: The Extended Sill of a Fjord Susan Allen Department of Earth, Ocean and Atmospheric Sciences University of British Columbia October 24, 2017 1
  2. 2. What causes water to move? Ehab Samy 2
  3. 3. What causes water to move? Baie Burrard carte avec toponymes en francais.svg: Arct derivative work: Themightyquill via Wikimedia Commons 3
  4. 4. Order for Burrard Inlet Tides Winds Freshwater BUT: The freshwater sets up the stratification that significantly affects the wind-driven currents AND: The tidal mixing significantly affects the freshwater stratification 4
  5. 5. Classic Estuary Circulation Thomson, 1981 5
  6. 6. Burrard Inlet is the sill for Indian Arm Fjord Isachsen, 1998 6
  7. 7. Burrard Inlet Stratification Thomson, 1981 7
  8. 8. Tidal Mixing Strong currents flowing over rough bottoms cause strong mixing. Album of Fluids 8
  9. 9. Burrard Estuarine Circulation: A Sketch First Narrows Second Narrows Indian Arm Strait of Georgia original 9
  10. 10. Burrard Inflow Circulation: A Sketch First Narrows Second Narrows Indian Arm Strait of Georgia original 10
  11. 11. How much is Strait of Georgia Water? If incoming water has salinity 28 g/kg and freshwater has salinity 0 g/kg then: water with salinity 14 g/kg is half and half and water with salinity about 24 g/kg is about 85% Strait of Georgia water 11
  12. 12. How long does the water stay in Burrard Inlet? Harder Question. Deep water in Indian Arm is only renewed once every three years. A quick estimate of freshwater residence time gives about 1/2 a year. 12
  13. 13. Summary Burrard Inlet is the sill region of a fjord. Tides in this constricted waterway cause strong mixing. This mixing interrupts and reduces the estuarine flow. First Narrows Second Narrows Indian Arm Strait of Georgia 13

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