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首页> 外文期刊>Environmental Science & Technology >Mobilization and Transport of Naturally Occurring Enterococci in Beach Sands Subject to Transient Infiltration of Seawater
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Mobilization and Transport of Naturally Occurring Enterococci in Beach Sands Subject to Transient Infiltration of Seawater

机译：海水短暂渗入的沙滩沙中天然存在的肠球菌的动员和运输

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摘要

This study explores the transport of enterococci (ENT) from naturally contaminated heach sands to the groundwater table via infiltrating seawater using field, laboratory, and modeling experiments. ENT were readily mobilized and transported through the unsaturated zone during infiltration events in both the field and laboratory column experiments. Detachment mechanisms were investigated using a modified version of HYDRUS-1D. Three models for detachment kinetics were tested. Detachment kinetics that are first order with respect to the rate of change in the water content and attached surface bacterial concentrations were found to provide a best fit between predicted and observed data. From these experimental and model results we conclude that detachment mechanisms associated with the rapid increases in pore water content such as air-water interface scouring and thin film expansion are likely drivers of ENT mobilization in the investigated system. These findings suggest that through-beach transport of ENT may be an important pathway through which ENT from beach sands are transported to beach groundwater where they may be discharged to coastal waters via submarine groundwater discharge.
机译：这项研究利用田间，实验室和模型实验，探索了通过渗透海水将肠球菌（ENT）从自然污染的泥沙中运到地下水位的过程。在田间实验和实验室柱实验中，在入渗过程中，ENT很容易动员并通过不饱和带运输。拆离机制进行了调查，使用HYDRUS-1D的修改版本。测试了三种分离动力学模型。发现相对于水含量和附着的表面细菌浓度的变化速率而言是一阶的分离动力学在预测数据和观察数据之间提供了最佳拟合。从这些实验和模型结果中，我们得出结论，与孔隙水含量快速增加相关的分离机制（如空气-水界面冲刷和薄膜膨胀）可能是所研究系统中ENT迁移的驱动力。这些发现表明，耳鼻喉的跨海滩运输可能是将耳鼻喉科从沙滩上的沙子运输到海滩地下水的重要途径，在那里它们可能通过海底地下水排放而被排放到沿海水域。

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  • 来源
    《Environmental Science & Technology》 |2012年第11期|p.5988-5996|共9页
  • 作者

    Todd L.Russell; Kevan M.Yamahara; Alexandria B.Boehm;

  • 作者单位

    Environmental and Water Studies, Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States;

    Environmental and Water Studies, Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States;

    Environmental and Water Studies, Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States,Dept. Civil and Environmental Engineering, 473 Via Ortega, Room 189, MC 4020, Stanford, CA 94305;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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