herbicides in metro atlanta streams and rivers
DESCRIPTION
Herbicides in Metro Atlanta Streams and Rivers. Data Analysis Cristal Moon. Rivers. Suwanee Creek Nickajack Creek Chattahoochee River. Questions. Do herbicide levels have yearly trends? Are they related to other factors in surface water?. Variability of two Pesticides in Chattahoochee. - PowerPoint PPT PresentationTRANSCRIPT
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Herbicides in Metro Atlanta Streams and Rivers
Data Analysis
Cristal Moon
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Rivers
Suwanee Creek
Nickajack Creek
Chattahoochee River
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Questions• Do herbicide levels have yearly trends?• Are they related to other factors in surface
water?
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Variability of two Pesticides in Chattahoochee
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Levels for Nickajack Creek
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Levels for Suwanee Creek
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Least Squares Regression
+ is levels, green line is regression, red bars are 95% confidence levels
Error variance=0.3095Correlation Coefficient= 0.1375P-value=0.1814
Error variance=0.0089Correlation Coefficient= 0.1681P-value=0.1016
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Normal?
Chi2=4,337,300Chi2inv=118.7516Chi2>Chi2inv, therefore distribution is not normal
Chi2= 527.3569, Chi2inv=118.7516Chi2>Chi2inv, therefore distribution is not normal
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Discharge vs. Herbicides
Correlation Coefficient: 0.0374P-value=0.7174
Correlation Coefficient: -0.0133P-value= 0.8974
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Specific Conductance vs. Herbicides
Correlation Coefficient= -0.1757P-value= 0.0868
Correlation Coefficient= -0.2161P-value= 0.0344
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pH
Correlation Coefficient= 0.0063P-value= 0.9515
Correlation Coefficient=-0.0919P-value= 0.3732
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Principle Component Regression
Green is Least-Squares, Blue is Reduced Major Axis, Black is PCR
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LSSA
Significant frequencies (in Hz) at 0.97765Corresponding powers: 16.0276
Significant frequencies (in Hz) at 0.97765Corresponding powers: 8.7976
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Conclusions
• Annual increase in herbicides early in year• Linear increase over time• Levels not related to pH or discharge• Specific Conductance somewhat correlated