Trends in River Flow and Population Dynamics Ryan Birmingham Note - PowerPoint PPT Presentation

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Trends in River Flow and Population Dynamics Ryan Birmingham Note on Unlabeled Figure Order Atlanta Buford GA 280 Norcross Roswell Peachtree Creek (not Chattahoochee) Why This Topic The 1996 Olympics The population trend in the county

Trends in River Flow and Population Dynamics Ryan Birmingham
Note on Unlabeled Figure Order Atlanta Buford GA 280 Norcross Roswell Peachtree Creek (not Chattahoochee)
Why This Topic The 1996 Olympics The population trend in the county Fulton: 600k in 1990, 1.1 m in 2000 The water!
The Data Chattahoochee river flow (sampled about once every 15 min, over 1990 to 2000) Peachtree Creek, same data
Summary of Data
Autocorrelation
Xcorr Atlanta Buford GA 280 Norcross Roswell Peachtree Creek
Fitting Curves, single oscillation
Fitting Curves, ‘fourier4’
Manual attempt to remove seasonality
Removing ‘fourier4’ model
Year Boxplot
Month Boxplot
Linear model (flow~year+month)
Response to Month
Response to Year
Conclusions Clearly Not Definitive Seems that there is a suggestion of a trend Flow Fluctuates Wildly
Discussion Lots of Outliers Unable to validate consistently Unable to find detailed-enough data on weather and Lake Lanier activity to remove that component. New Question: What happened to other water sources during 1990 to 2000?

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