Center for Marine Environmental Ecology, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Qinhuangdao Marine Environmental Monitoring Central Station, SOA, Qinhuangdao, Hebei 066002, China.
Sci Total Environ. 2019 May 1;663:400-407. doi: 10.1016/j.scitotenv.2019.01.369. Epub 2019 Jan 29.
With the escalating coastal development and loss of vegetated landscape, the volume of storm runoff increases significantly in Chinese coastal cities. To protect human health and valuable recreational resources, it is necessary to develop a quantitative understanding of coastal pollution. Here we studied the influence of storm runoff on the nutrients and microbial pathogens at two popular bathing beaches in northern China. Dongshan Beach, located near the mouth of an urban river, is influenced by non-point source pollution while Tiger-Rock Beach, a coastal beach, is primarily influenced by a point source from a storm drain outfall. Storm runoff significantly (P < 0.001) decreased the salinity and Chl a post-storm at both the beaches, but only reduced the concentration of dissolved inorganic N at Tiger-Rock Beach. Escherichia coli decreased by 68.7% at Dongshan Beach, possibly due to the dilution effect of the stormflow, contradicting the notion of elevated fecal contamination in coastal beaches from storm runoff. Vibrio parahaemolyticus increased at both beaches post-storm, by 155.7% at Dongshan Beach and 136.7% at Tiger-Rock Beach. Regardless of storm impact, both E. coli and V. parahaemolyticus were much higher at Dongshan Beach than that at Tiger-Rock, suggesting the influence of different surrounding topographies. Lastly, the statistical models developed based on the environmental and microbial parameters regression showed predictive power (adjusted R > 0.5) to estimate the concentration of E. coli at Dongshan Beach and V. parahaemolyticus at Tiger-Rock Beach. Overall, the results suggest the unique role of the individual beaches in attenuating the effect of rainfall on the concentration of microbial pathogens in bathing water quality and provide unique predictive models for recreational water management and public health protection.
随着沿海地区的发展和植被景观的丧失，中国沿海城市的风暴径流体积显著增加。为了保护人类健康和宝贵的娱乐资源，有必要定量了解沿海污染。在这里，我们研究了风暴径流对中国北方两个受欢迎的海滨浴场的营养物质和微生物病原体的影响。东山海滩位于城市河流的河口附近，受到非点源污染的影响，而老虎岩海滩则主要受到一个来自风暴排水口的点源的影响。风暴径流显著（P<0.001）降低了两个海滩的盐度和风暴后 Chl a，但仅降低了老虎岩海滩的溶解无机 N 浓度。大肠杆菌在东山海滩减少了 68.7%，这可能是由于风暴流的稀释效应，与风暴径流导致沿海海滩粪便污染升高的观点相矛盾。副溶血性弧菌在两个海滩雨后均增加，东山海滩增加了 155.7%，老虎岩海滩增加了 136.7%。无论风暴的影响如何，大肠杆菌和副溶血性弧菌在东山海滩的浓度都远高于老虎岩海滩，这表明了不同周围地形的影响。最后，基于环境和微生物参数回归的统计模型显示出预测能力（调整后的 R>0.5），可以估计东山海滩的大肠杆菌浓度和老虎岩海滩的副溶血性弧菌浓度。总的来说，这些结果表明，个别海滩在减轻降雨对海水浴场水质中微生物病原体浓度的影响方面发挥着独特的作用，并为娱乐用水管理和公共卫生保护提供了独特的预测模型。
