Variability of Intra-event Statistics for Multiple Fecal Indicator Bacteria in Urban Stormwater

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• 作者：J. M. Hathaway ; W. F. Hunt ; D. T. McCarthy
• 关键词：Intra ; event ; E. coli ; Enterococci ; Fecal coliform ; Urban stormwater ; Variability
• 刊名：Water Resources Management
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：29
• 期：10
• 页码：3635-3649
• 全文大小：724 KB
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• 作者单位：J. M. Hathaway (1)
  W. F. Hunt (2)
  D. T. McCarthy (3)
  
  1. University of Tennessee, Knoxville, TN, 37996, USA
  2. North Carolina State University, Raleigh, NC, 27695, USA
  3. Environmental and Public Health Microbiology Laboratory, Civil Engineering, Monash University, Melbourne, VIC, Australia, 3800
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geotechnical Engineering
  Meteorology and Climatology
  Civil Engineering
  Environment
  
• 出版者：Springer Netherlands
• ISSN：1573-1650

文摘

Pathogens in surface waters continue to be a worldwide concern. The potential presence of pathogens is often identified through the use of fecal indicator bacteria such as fecal coliform, E. coli, and enterococci, each of which are still utilized worldwide depending on local regulations. Urban stormwater runoff has been shown to convey fecal indicator bacteria to surface waters; however, the fate and transport dynamics of these microbes in urban stormwater are not well established. This is particularly the case for intra-event (within event) processes. The intra-event characteristics of total suspended solids and three types of fecal indicator bacteria (FIB), fecal coliform, E. coli, and enterococci, were analysed for a watershed in Raleigh, NC, USA. FIB showed higher variability than TSS among intra-event characteristics such as normalized peak concentration, rate of change, and normalized concentration in the first 3?mm of rainfall (C3mm), but similar variability in concentrations throughout each storm. FIB intra-event statistics appear to be influenced by climate variables whereas total suspended sediments statistics are most influenced by hydrologic variables. Changes in intra-event total suspended concentrations were consistently well described by rainfall intensity, while FIB correlations with rainfall intensity were weaker and inconsistent between events. This study showed similar patterns of variability among the intra-event FIB statistics and comparable correlations to climatic and hydrologic variables between fecal coliform, E. coli, and enterococci. Thus, similar processes appear to influence the variability of all three indicator bacteria, suggesting that microbial models may be adaptable amongst various types of FIB.