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Environmental Factors and Flow Paths Related to Escherichia coli Concentrations at Two Beaches on Lake St. Clair, Michigan

Regression analyses and hydrodynamic modeling were used to identify   environmental factors and flow paths associated with Escherichia   coli (E. coli) concentrations at Memorial and Metropolitan Beaches   on Lake St. Clair in Macomb County, Mich. Linear regression,   regression-tree, and logistic regression models were developed from   E. coli concentration and ancillary environmental data.     A two-dimensional hydrodynamic model was developed to simulate   horizontal current patterns on Lake St. Clair in response to wind,   flow, and water-level conditions at model boundaries. Simulated   velocity fields were used to track hypothetical massless particles   backward in time from the beaches along flow paths toward source   areas. Reverse particle tracking for idealized steady-state   conditions shows changes in expected flow paths and traveltimes with   wind speeds and directions from 24 sectors. The results indicate   that three to four sets of contiguous wind sectors have similar   effects on flow paths in the vicinity of the beaches. In addition,   reverse particle tracking was used for transient conditions to   identify expected flow paths for 1  E. coli sampling events in 2  4.   These results demonstrate the ability to track hypothetical   particles from the beaches, backward in time, to likely source   areas. This ability, coupled with a greater frequency of bacteria   sampling, may provide insight into changes in bacteria   concentrations between source and sink areas.     (Lake St. Clair); (E. coli); (Escherichia coli); (beach closure);   (beach closures); (beach closing); (beach closings); (water   temperature); (turbidity); (rainfall); (AOC); (area of concern) 

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
Biochemical
Landscape
Physical/Chemical
Lake Basin Connecting Channels
Lake St. Clair
St. Clair River
State Province
Michigan
Resource Being Monitored
Human Health
Beneficial Use Impairment Assessments
Beach Closings
Annex Numbers
Pollution from Contaminated Groundwater
Pollution from Non-Point Sources
Remedial Action Plans and Lakewide Management Plans
Research & Development
Annex 17
Effects of varying lake levels and relation to pollution sources, fate and effects
Physical and transformational processes affecting delivery of pollutants
General
Annex
  • Annex Numbers
    Annex Numbers
    Pollution from Contaminated Groundwater
    Pollution from Non-Point Sources
    Remedial Action Plans and Lakewide Management Plans
    Research & Development
  • Annex 17
    Annex 17
    Effects of varying lake levels and relation to pollution sources, fate and effects
    Physical and transformational processes affecting delivery of pollutants

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