Environmental Monitoring and Assessment

, Volume 185, Issue 12, pp 10131–10145 | Cite as

Pre- and post-fire pollutant loads in an urban fringe watershed in Southern California

  • M. P. Burke
  • T. S. Hogue
  • A. M. Kinoshita
  • J. Barco
  • C. Wessel
  • E. D. Stein
Article

Abstract

Post-fire runoff has the potential to be a large source of contaminants to downstream areas. However, the magnitude of this effect in urban fringe watersheds adjacent to large sources of airborne contaminants is not well documented. The current study investigates the impacts of wildfire on stormwater contaminant loading from the upper Arroyo Seco watershed, burned in 2009. This watershed is adjacent to the Greater Los Angeles, CA, USA area and has not burned in over 60 years. Consequently, it acts as a sink for regional urban pollutants and presents an opportunity to study the impacts of wildfire. Pre- and post-fire storm samples were collected and analyzed for basic cations, trace metals, and total suspended solids. The loss of vegetation and changes in soil properties from the fire greatly increased the magnitude of storm runoff, resulting in sediment-laden floods carrying high concentrations of particulate-bound constituents. Post-fire concentrations and loads were up to three orders of magnitude greater than pre-fire values for many trace metals, including lead and cadmium. A shift was also observed in the timing of chemical delivery, where maximum suspended sediment, trace metal, and cation concentrations coincided with, rather than preceded, peak discharge in the post-fire runoff, amplifying the fire’s impacts on mass loading. The results emphasize the importance of sediment delivery as a primary mechanism for post-fire contaminant transport and suggest that traditional management practices that focus on treating only the early portion of storm runoff may be less effective following wildfire. We also advocate that watersheds impacted by regional urban pollutants have the potential to pose significant risk for downstream communities and ecosystems after fire.

Keywords

Wildfire Urban fringe Stormwater Los Angeles Metals 

Notes

Acknowledgments

This research was supported by a National Science Foundation (NSF) Hydrologic Sciences Grant (EAR #0707162) and by an NSF GK-12 Fellowship (#DGE-0742410). Additional support was provided by the California Water Resources Control Board, the Construction Industry Coalition on Water Quality (CICWQ), and the Construction Industry Advancement Fund. No funding source had any influence on the study design, data collection, analysis or interpretation, or writing or submission of this manuscript. Thank you to our field helpers Sharon Liu and Forest Pfeiffer.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • M. P. Burke
    • 1
    • 3
  • T. S. Hogue
    • 1
    • 4
  • A. M. Kinoshita
    • 1
    • 4
  • J. Barco
    • 1
    • 5
  • C. Wessel
    • 1
    • 6
  • E. D. Stein
    • 2
  1. 1.Department of Civil and Environmental EngineeringUCLALos AngelesUSA
  2. 2.Southern California Coastal Water Research ProjectCosta MesaUSA
  3. 3.RESPEC Consulting and ServicesRapid CityUSA
  4. 4.Civil and Environmental EngineeringColorado School of MinesGoldenUSA
  5. 5.University of MedellinMedellinColombia
  6. 6.Geosyntec ConsultantsLos AngelesUSA

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