Hydrologic modeling of pathogen fate and transport
Hydrologic modeling of pathogen fate and transport
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DOI：
10.1021/es060426z
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发表时间：
2006-08-01
影响因子：
11.4
通讯作者：
Huck, Peter M.
中科院分区：
文献类型：
--
作者：
Dorner, Sarah M.;Anderson, William B.;Huck, Peter M.
已经为大肠杆菌和几种水生病原体开发了一个流域尺度的归宿和运输模型：隐孢子虫属，贾第虫属，弯曲杆菌属（Campylobacter spp.）coli O157：H7。其目的是确定用于饮用水供应的分水岭中病原体污染的主要来源，并更好地了解最影响其生存和运输的因素。为了预测指示细菌和病原体在地表水中的水平，现有的水文模型，WATFLOOD，增加病原体运输和测试在加拿大西南部的安大略流域。病原体模型认为运输作为一个结果，地表径流，地下流瓷砖排水系统，并在流路由。该模型预测，大多数微生物进入流从陆基来源进入流从瓷砖排水系统，而不是陆上运输。虽然该模型预测陆路运输是罕见的，当它发生时，它对应于最高的观察和模拟的微生物浓度。此外，测量E.在风暴事件期间的大肠杆菌浓度表明，从河流沉积物中重新悬浮的微生物可能是同等或更大的重要性比陆基来源的病原体。
A watershed-scale fate and transport model has been developed for Escherichia coli and several waterborne pathogens: Cryptosporidium spp., Giardia spp., Campylobacter spp, and E. coli O157:H7. The objectives were to determine the primary sources of pathogenic contamination in a watershed used for drinking water supply and to gain a greater understanding of the factors that most influence their survival and transport. To predict the levels of indicator bacteria and pathogens in surface water, an existing hydrologic model, WATFLOOD, was augmented for pathogen transport and tested on a watershed in Southwestern Ontario, Canada. The pathogen model considered transport as a result of overland flow, subsurface flow to tile drainage systems, and in-stream routing. The model predicted that most microorganisms entering the stream from land-based sources enter the stream from tile drainage systems rather than overland transport. Although the model predicted overland transport to be rare, when it occurred, it corresponded to the highest observed and modeled microbial concentrations. Furthermore, rapid increases in measured E. coli concentrations during storm events suggested that the resuspension of microorganisms from stream sediments may be of equal or greater importance than land-based sources of pathogens.