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Elements of a predictive model for determining beach closures on a real time basis: the case of 63rd Street Beach Chicago

Environmental Monitoring and Assessment

By:
and
DOI: 10.1023/B:EMAS.0000038185.79137.b9

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Abstract

Data on hydrometeorological conditions and E. coli concentration were simultaneously collected on 57 occasions during the summer of 2000 at 63rd Street Beach, Chicago, Illinois. The data were used to identify and calibrate a statistical regression model aimed at predicting when the bacterial concentration of the beach water was above or below the level considered safe for full body contact. A wide range of hydrological, meteorological, and water quality variables were evaluated as possible predictive variables. These included wind speed and direction, incoming solar radiation (insolation), various time frames of rainfall, air temperature, lake stage and wave height, and water temperature, specific conductance, dissolved oxygen, pH, and turbidity. The best-fit model combined real-time measurements of wind direction and speed (onshore component of resultant wind vector), rainfall, insolation, lake stage, water temperature and turbidity to predict the geometric mean E.coliconcentration in the swimming zone of the beach. The model, which contained both additive and multiplicative (interaction) terms, accounted for 71% of the observed variability in the log E. coliconcentrations. A comparison between model predictions of when the beach should be closed and when the actualbacterial concentrations were above or below the 235 cfu 100 ml-1 threshold value, indicated that the model accurately predicted openingsversus closures 88% of the time.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Elements of a predictive model for determining beach closures on a real time basis: the case of 63rd Street Beach Chicago
Series title:
Environmental Monitoring and Assessment
DOI:
10.1023/B:EMAS.0000038185.79137.b9
Volume:
98
Issue:
1-3
Year Published:
2004
Language:
English
Publisher:
Springer
Contributing office(s):
Great Lakes Science Center
Description:
16 p.
First page:
175
Last page:
190
Online Only (Y/N):
N
Additional Online Files (Y/N):
N