The role of resuspension in enterococci distribution in water at an urban beach
The role of resuspension in enterococci distribution in water at an urban beach
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DOI：
10.2166/wst.2003.0196
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发表时间：
2003-01-01
影响因子：
2.7
通讯作者：
Lewis, GD
中科院分区：
文献类型：
--
作者：
Le Fevre, NM;Lewis, GD
研究了某小型城市河段细菌再悬浮过程及其对微生物水质的影响。在一个小型城市海湾对水和沉积物进行肠球菌采样，采样的时间尺度既不规则又密集，重点是粪便污染系统的潜在来源。沉积物中肠球菌的分布受肠球菌主要来源的位置和微生物质量的影响。河流和雨水贡献了最多数量的肠球菌，因此，在这些来源排放点周围的水和沉积物中都发现了大量的肠球菌。为了研究细菌再悬浮，在浪峰经过时从冲浪区（水深1-1.5 m）收集水样。在海床以上10 cm和水面以下10 cm的每个采样位置同时采集两个样品。对样本进行肠球菌分析，并将数据与邻近沉积物以及溪流和雨水水源中的细菌数量进行比较。肠球菌在水柱中的垂直分布数据显示了细菌再悬浮的时空变化，并证明了波浪作用的作用。波浪下细菌的再悬浮与天气和波浪条件直接相关。在冲浪区之外未检测到肠球菌的再悬浮，这表明波浪作用是研究地点再悬浮的主要原因。
This study investigated the process and effects of bacterial resuspension on microbiological water quality in a small urban embayment. Water and sediments were sampled for enterococci at a small urban bay, on both irregular and intensive time scales, with a focus on the potential sources of faecal contamination to the system. Distribution of enterococci in sediments was influenced by the location and microbiological quality of major sources of enterococci to the embayment. Stream and storm water contributed the greatest numbers of enterococci and, consequently, high numbers of enterococci were found in both water and sediments surrounding discharge points for these sources. To investigate bacterial resuspension, water samples were collected from within the surf zone (at water depths of 1-1.5 m) as a wave crest passed. Two samples were collected simultaneously at each sampling location at 10 cm above the seabed and 10 cm below the water surface. Samples were analysed for enterococci and data compared with bacterial numbers in adjacent sediments as well as in stream and storm water sources. Vertical distribution data for enterococci in the water column revealed evidence of spatial and temporal variability in bacterial resuspension and the role of wave action was demonstrated. Bacterial resuspension under waves was directly related to weather and wave conditions. The resuspension of enterococci was not detected beyond the surf zone suggesting that wave action was the main cause of resuspension at the study site.