Back to Search
Start Over
Meteorological effects on the levels of fecal indicator bacteria in an urban stream: A modeling approach
- Source :
- Water Research. 44:2189-2202
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- Gwangju Creek (GJC) in Korea, which drains a highly urbanized watershed, has suffered from substantial fecal contamination, thereby limiting the beneficial use of the water in addition to threatening public health. In this study, to quantitatively estimate the sinks and sources of fecal indicator bacteria (FIB) in GJC under varying meteorological conditions, two FIB (i.e., Escherichia coli and enterococci bacteria) were monitored hourly for 24 h periods during both wet and dry weather conditions at four sites along GJC, and the collected data was subsequently used to develop a spatiotemporal FIB prediction model. The monitoring data revealed that storm washoff and irradiational die-off by sunlight are the two key processes controlling FIB populations in wet and dry weather, respectively. FIB populations significantly increased during precipitation, with greater concentrations occurring at higher rainfall intensity. During dry weather, FIB populations decreased in the presence of sunlight in daytime but quickly recovered at nighttime due to continuous point-source inputs. In this way, the contributions of the key processes (i.e., irradiational die-off by sunlight, settling, storm washoff, and resuspension) to the FIB levels in GJC under different meteorological conditions were quantitatively estimated using the developed model. The modeling results showed that the die-off by sunlight is the major sink of FIB during the daytime in dry weather with a minor contribution from the settling process. During wet weather, storm washoff and resuspension are equally important processes that are responsible for the substantial increase of FIB populations.
- Subjects :
- Pollution
Geologic Sediments
Environmental Engineering
Urban stream
Rain
media_common.quotation_subject
Indicator bacteria
Sink (geography)
Feces
Rivers
Escherichia coli
Water Movements
Animals
Humans
Precipitation
Cities
Waste Management and Disposal
Water Science and Technology
Civil and Structural Engineering
media_common
Hydrology
geography
geography.geographical_feature_category
Ecological Modeling
Water Pollution
Storm
Models, Theoretical
Contamination
Fecal coliform
Sunlight
Environmental science
Algorithms
Enterococcus
Environmental Monitoring
Subjects
Details
- ISSN :
- 00431354
- Volume :
- 44
- Database :
- OpenAIRE
- Journal :
- Water Research
- Accession number :
- edsair.doi.dedup.....e18603548b9cb2f81f04e9def74ee233