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首页> 外文期刊>Environmental Science & Technology >Tidal forcing of enterococci at marine recreational beaches at fortnightly and semidiurnal frequencies
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Tidal forcing of enterococci at marine recreational beaches at fortnightly and semidiurnal frequencies

机译：每两周和半日一次在海洋休闲海滩上肠球菌的潮汐强迫

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Marine beach water quality is typically monitored in early morning once a week without respect to tidal condition. To assess the effect of tide on this public health warning system, we analyzed enterococci (ENT) data from 60 southern California marine beaches with differing geomorphology, orientation, and proximity to runoff sources. ENT concentrations during spring tides were significantly higher (p < 0.1) than those during neap tides at 50 of the beaches, and at the majority of these, water samples were also more than twice as likely to be out of compliance with the ENT single-sample standard during spring tides compared to neap tides. When tide range (springeap) and tide stage (ebb/flood) conditions were considered together, spring-ebb tides yielded the highest ENT concentrations and the greatest chance of exceeding the single-sample standard at the majority of beaches. The proximity to a terrestrial runoff source, the slope of the runoff source, the slope of the beach, and the orientation of the beach had minimal influence on the tidal modulation of ENT concentrations. The presence of spring and spring-ebb tide signals at such a great percentage of beaches suggests that tide should be considered in the design and interpretation of beach monitoring program data. It also suggests that ENT delivered by tidally forced sources other than terrestrial surficial runoff are widespread. Possibilities include ENT-laden groundwater (saline and fresh) from the beach aquifer as well as ENT-enriched sands, decaying wrack, and bird feces near the high water line.
机译：通常不考虑潮汐条件，每周一次清晨监测海洋海滩水质。为了评估潮汐对这种公共卫生预警系统的影响，我们分析了加利福尼亚州南部60个海洋海滩的肠球菌（ENT）数据，这些海滩具有不同的地貌，方向和与径流源的距离。在50个海滩上，春季潮汐中的ENT浓度显着高于（处于潮汐时）的ENT浓度（大多数情况下），水样不符合ENT单一标准的可能性也要高出两倍以上。与潮汐相比，春季潮汐的样本标准。综合考虑潮汐范围（春季/夏季）和潮汐阶段（潮/潮）的条件，大多数海滩上的春季潮汐潮汐产生最高的ENT浓度，并且超过单次采样标准的可能性最大。靠近地面径流源，径流源的坡度，海滩的坡度和海滩的方向对ENT浓度的潮汐调制影响最小。在如此多的海滩上都存在春季和春季退潮信号，这表明在设计和解释海滩监测程序数据时应考虑潮汐。这也表明，除地面表层径流以外，由潮汐强迫源传递的耳鼻喉很普遍。可能性包括来自含水层的含耳鼻喉科的地下水（盐水和淡水）以及富含耳鼻喉科的沙子，腐烂的残骸和高水位线附近的鸟粪。

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