Identifying Pollutant Sources in Tidally Mixed Systems: Case Study of Fecal Indicator Bacteria from Marinas in Newport Bay, Southern California
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- 作者：Youngsul Jeong ; Stanley B. Grant ; Scott Ritter ; Abhishek Pednekar ; Linda Candelaria ; and Clinton Winant
- 刊名：Environmental Science & Technology
- 出版年：2005
- 出版时间：December 1, 2005
- 年：2005
- 卷：39
- 期：23
- 页码：9083 - 9093
- 全文大小：757K
- 年卷期：v.39,no.23(December 1, 2005)
- ISSN：1520-5851
文摘
This study investigates the contribution of several marinasto fecal indicator bacteria impairment in Newport Bay, aregionally important tidal embayment in southern California.Three different fecal indicator bacteria groups wereassayed, including total coliform, Escherichia coli, andenterococci bacteria, all measured using the IDEXX Colilertand Enterolert system. To document temporal variabilityin the fecal indicator bacteria signal, water column samples(n = 4132) were collected from two marinas over timescales ranging from hours to months. To document spatialvariability of the fecal indicator bacteria signal, watercolumn and sediment samples were collected from a numberof sites (n = 11 to 36, depending on the study) in andaround the two marinas, over spatial scales ranging frommeters to kilometers. To identify the dominant temporaland spatial patterns in these data a statistical approach-Empirical Orthogonal Function analysis-was utilized.Finally, to clarify the transport pathways responsible forthe observed temporal and spatial patterns, fecal indicatorbacteria data were compared to simultaneous measurementsof tidal flow, temperature, and salinity. The results ofthis field effort collectively implicate runoff-both dry weatherrunoff at sampling sites located near some storm drainsand wet weather runoff at all sites-as a primary source offecal indicator bacteria in the water column and subtidalsediments. The results and analysis presented here reinforcethe growing body of evidence that management of fecalindicator bacteria impairment in the coastal waters of southernCalifornia will require developing long-term strategies fortreating nonpoint sources of both dry weather and stormwaterrunoff.