Fall 2010 Nikki Byrd. What is turbidity? Measure of water clarity Degree to which water is scattered and absorbed Causes  Heavy rainfall, storms  Algal.

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Presentation transcript:

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

What is turbidity?

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

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 Turbidity

Measuring turbidity

Measuring Turbidity

Cruise 1 Turbidity

Cruise 2 Turbidity

Cruise 1 v LCFRP

Cruise 2 v LCFRP

Cruise 1 v. Class Averages

Cruise 2 v. Class Averages

Turbidity v. Surface Salinity- Cruise 1 H B M18

Turbidity v. Deep Salinity-Cruise 1

Turbidity v. Surface Salinity- Cruise 2

Turbidity v. Deep Salinity-Cruise 2

Turbidity v. K d -Cruise 1

Turbidity v. K d -Cruise 2

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 1 st cruise, M54 for 2 nd cruise Decrease with salinity Dilution Direct relationship with K d for both cruises, surface and deep