Meteorological effects on the levels of fecal indicator bacteria in an urban stream: A modeling approach
Meteorological effects on the levels of fecal indicator bacteria in an urban stream: A modeling approach
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DOI：
10.1016/j.watres.2009.12.051
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发表时间：
2010-04-01
期刊：
影响因子：
12.8
通讯作者：
Kim, Joon Ha
中科院分区：
文献类型：
--
作者：
Cho, Kyung Hwa;Cha, Sung Min;Kim, Joon Ha
韩国的光州溪（QC）是一个高度城市化的流域，受到大量粪便污染，从而限制了水的有益利用，并威胁到公众健康。为了定量评估不同气象条件下GJC粪便指示细菌（FIB）的汇和源，本研究采用了两种FIB（即，大肠杆菌和肠球菌细菌）进行了监测，每小时24小时的周期，在潮湿和干燥的天气条件下，在四个站点沿着GJC，收集的数据随后被用来开发一个时空FIB预测模型。监测数据表明，暴雨冲刷和阳光照射死亡是控制FIB种群的两个关键过程，分别在潮湿和干燥的天气。FIB人口显着增加，在降水过程中，更高的浓度发生在更高的降雨强度。在干燥的天气，FIB人口减少，在阳光的存在下，白天，但在夜间迅速恢复，由于连续的点源输入。这样，关键过程的贡献（即，利用所建立的模型，定量估算了不同气象条件下（太阳光、沉降、风暴冲刷和再悬浮）对GJC中FIB水平的影响。模拟结果表明，在干燥的天气中，日光的死亡是FIB在白天的主要汇，而沉降过程的贡献较小。在潮湿的天气，风暴冲刷和再悬浮是同样重要的过程，是负责FIB人口的大幅增加。(C)2010爱思唯尔有限公司保留所有权利。
Gwangju Creek (QC) 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. (C) 2010 Elsevier Ltd. All rights reserved.