Spatiotemporal variability and key influencing factors of river fecal coliform within a typical complex watershed

WATER RESEARCH

卷:178

Article

Zhang, Xiaoyue¹  Zhi, Xiaosha^1,2  Chen, Lei¹  Shen, Zhenyao¹ 

[1] Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China

[2] Minist Environm Protect, Satellite Environm Ctr, Beijing 100094, Peoples R China

关键词: Fecal coliform;    Complex watershed;    Urban patterns;    Multivariable regressions;    Spatiotemporal dynamics;    Non-point source pollution;   

DOI  :  10.1016/j.watres.2020.115835

来源: Elsevier

【 摘 要 】

Fecal coliform bacteria are a key indicator of human health risks; however, the spatiotemporal variability and key influencing factors of river fecal coliform have yet to be explored in a rural-suburban-urban watershed with multiple land uses. In this study, the fecal coliform concentrations in 21 river sections were monitored for 20 months, and 441 samples were analyzed. Multivariable regressions were used to evaluate the spatiotemporal dynamics of fecal coliform. The results showed that spatial differences were mainly dominated by urbanization level, and environmental factors could explain the temporal dynamics of fecal coliform in different urban patterns except in areas with high urbanization levels. Reducing suspended solids is a direct way to manage fecal coliform in the Beiyun River when the natural factors are difficulty to change, such as temperature and solar radiation. The export of fecal coliform from urban areas showed a quick and sensitive response to rainfall events and increased dozens of times in the short term. Landscape patterns, such as the fragmentation of impervious surfaces and the overall landscape, were identified as key factors influencing urban non-point source bacteria. The results obtained from this study will provide insight into the management of river fecal pollution. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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