DOI: 10.1016/j.watres.2018.07.021
Scopus记录号: 2-s2.0-85053027275
论文题名: Spatially explicit pollutant load-integrated in-stream E. coli concentration modeling in a mixed land-use catchment
作者: Thilakarathne M. ; Sridhar V. ; Karthikeyan R.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 87
结束页码: 103
语种: 英语
英文关键词: Bacteria
; E.coli
; Resuspension
; Source characterization
; SWAT
Scopus关键词: Bacteria
; Catchments
; Deposition
; Escherichia coli
; Land use
; Rivers
; Sediments
; Soil conservation
; Water conservation
; Water management
; E.coli
; Hydrological response unit
; In-stream E. coli concentrations
; Re-suspension
; Sediment water interface
; Soil and water assessment tool
; Source characterization
; SWAT
; River pollution
; bacterium
; catchment
; coliform bacterium
; concentration (composition)
; management practice
; nonpoint source pollution
; pollutant
; resuspension
; sediment-water interface
; soil and water assessment tool
; surface water
; United States
; Virginia
; Bacteria (microorganisms)
英文摘要: Pathogen contamination is a major cause of surface water impairment in the United States, and fecal bacteria levels are typically used to evaluate microbial loading in bodies of water. Environmental models are considered a useful tool for evaluating watershed management practices. In this study, we assessed E. coli contamination of the Upper Stroubles Creek, Virginia, USA using the Soil and Water Assessment Tool (SWAT) model. The study area has been declared an impaired body of water due to recent bacterial contamination. Bacterial source characterizations play a critical role in such modeling exercises and especially in the case of non-point sources. As the SWAT model involves bacteria load estimation at a Hydrological Response Unit (HRU) level, we use the Spatially Explicit Load Enrichment Calculation Tool (SELECT) for our E. coli load estimations. We also evaluate current approaches to the measurement of bacterial interactions of the sediment-water interface using SWAT and the frequent measurements of streambed E. coli concentrations. For the simulation of in-stream E. coli concentrations using estimates drawn from SELECT without (with) sediment bacteria resuspension-deposition, Nash–Sutcliffe Efficiency (NSE) values of −0.41 to 0.34 (−0.19 to 0.36) are found. Moreover, in-stream E. coli concentrations measured at flow duration intervals show that the model frequently overestimates mid-range flows while underestimating low-range flows even with model improvements. The use of high-resolution E. coli loads and the consideration of sediment bacteria resuspension-deposition processes, generated higher E. coli concentrations for forested areas compared to those of urban and pasture lands, suggesting the importance of using detailed bacteria load estimations and land use information when assessing E. coli distribution in the environment. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112496
Appears in Collections: 气候减缓与适应
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作者单位: Biological Systems Engineering, Virginia Polytechnic Institute and State University, 212 Seitz Hall, Blacksburg, VA 24061, United States; Department of Biological and Agricultural Engineering, Texas A&M University, 303G Scoates Hall, College Station, TX 77843, United States
Recommended Citation:
Thilakarathne M.,Sridhar V.,Karthikeyan R.. Spatially explicit pollutant load-integrated in-stream E. coli concentration modeling in a mixed land-use catchment[J]. Water Research,2018-01-01,144