Turbidity
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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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Turbidity

Turbidity

Fall 2010

Nikki Byrd


What is turbidity

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


What is turbidity1

What is turbidity?


Why does turbidity matter

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


Measuring turbidity

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


Measuring turbidity1

Measuring Turbidity


Measuring turbidity2

Measuring turbidity


Measuring turbidity3

Measuring Turbidity


Cruise 1 turbidity

Cruise 1 Turbidity


Cruise 2 turbidity

Cruise 2 Turbidity


Cruise 1 v 2008 lcfrp

Cruise 1 v. 2008 LCFRP


Cruise 2 v 2008 lcfrp

Cruise 2 v. 2008 LCFRP


Cruise 1 v class averages

Cruise 1 v. Class Averages


Cruise 2 v class averages

Cruise 2 v. Class Averages


Turbidity v surface salinity cruise 1

Turbidity v. Surface Salinity-Cruise 1

H B

M18


Turbidity v deep salinity cruise 1

Turbidity v. Deep Salinity-Cruise 1


Turbidity v surface salinity cruise 2

Turbidity v. Surface Salinity-Cruise 2


Turbidity v deep salinity cruise 2

Turbidity v. Deep Salinity-Cruise 2


Turbidity v k d cruise 1

Turbidity v. Kd-Cruise 1


Turbidity v k d cruise 2

Turbidity v. Kd-Cruise 2


Conclusions

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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