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Turbidity

Turbidity. Fall 2010 Nikki Byrd. What is turbidity?. Measure of water clarity Degree to which water is scattered and absorbed Causes Heavy rainfall, storms Algal blooms Flocculation in estuaries Waste discharge Run-off Land changes Native vegetation and agriculture POM/CDOM.

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Turbidity

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  1. Turbidity Fall 2010 Nikki Byrd

  2. What is turbidity? • Measure of water clarity • Degree to which water is scattered and absorbed • Causes • Heavy rainfall, storms • Algal blooms • Flocculation in estuaries • Waste discharge • Run-off • Land changes • Native vegetation and agriculture • POM/CDOM

  3. What is turbidity?

  4. Why does turbidity matter? • High turbidity effects • Drinking water • Correlation with high levels of pathogens • Reduced light penetration • Increased Kd • Photosynthesis • Dissolved oxygen • Water temperature • Dissolved oxygen

  5. Measuring turbidity • Secchi disk • Accuracy • Nephelometers • Common • Measures scattering • 90° from an incident beam of light • Scattering is proportional to turbidity • Relative units: NTU • More scattering = higher turbidity

  6. Measuring Turbidity

  7. Measuring turbidity

  8. Measuring Turbidity

  9. Cruise 1 Turbidity

  10. Cruise 2 Turbidity

  11. Cruise 1 v. 2008 LCFRP

  12. Cruise 2 v. 2008 LCFRP

  13. Cruise 1 v. Class Averages

  14. Cruise 2 v. Class Averages

  15. Turbidity v. Surface Salinity-Cruise 1 H B M18

  16. Turbidity v. Deep Salinity-Cruise 1

  17. Turbidity v. Surface Salinity-Cruise 2

  18. Turbidity v. Deep Salinity-Cruise 2

  19. Turbidity v. Kd-Cruise 1

  20. Turbidity v. Kd-Cruise 2

  21. Conclusions • Cruise 1 • Higher than LCFRP • No correlation with class average • Cruise 2 • Higher than LCFRP • Close to class average • Turbidity maximum around M 35, M42 for 1st cruise, M54 for 2nd cruise • Decrease with salinity • Dilution • Direct relationship with Kd for both cruises, surface and deep

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