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A study to estimate the fate and transport of bacteria in river water from birds nesting under a bridge

机译：估计筑巢在桥下的鸟类中河水中细菌的命运和运输的研究

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摘要

To investigate the effect of input parameters, such as the number of bridge-dwelling birds, decay rate of the bacteria, flow at the river, water temperature, and settling velocity, a parametric study was conducted using a water quality model developed with QUAL2Kw. The reach of the bacterial-impaired section from the direct droppings of bridge-nesting birds at the Guadalupe River near Kerrville, Texas was estimated using the model. The concentration of Escherichia coli bacteria were measured upstream, below the bridge, and downstream of the river for one-and-a-half years. The decay rate of the indicator bacteria in the river water was estimated from the model using measured data, and was found to be 6.5/day. The study suggests that the number of bridge-dwelling birds, the decay rate, and flow at the river have the highest impact on the fate and transport of bacteria. The water temperature moderately affects the fate and transport of bacteria, whereas, the settling velocity of bacteria did not show any significant effect. Once the decay rates are estimated, the reach of the impaired section was predicted from the model using the average flow of the channel. Since the decay rate does not vary significantly in the ambient environment at this location, the length of the impaired section primarily depends on flow.
机译：为了研究输入参数的影响，例如桥栖鸟类的数量，细菌的腐烂率，河流流量，水温和沉降速度，使用了使用QUAL2Kw开发的水质模型进行了参数研究。使用该模型估算了得克萨斯州克尔维尔附近的瓜达卢佩河上的桥梁筑巢鸟类直接滴下的细菌致残段的范围。在河中上游，桥下和河下游测量了一年半的大肠杆菌细菌浓度。使用测量数据从模型中估算出指示水中细菌指示剂的腐烂率，为6.5 /天。研究表明，栖居桥梁的鸟类数量，腐烂率和河流流量对细菌的命运和运输影响最大。水温适度地影响细菌的命运和运输，而细菌的沉降速度没有显示任何明显的影响。一旦估计了衰减率，就可以使用通道的平均流量从模型中预测出受损区域的范围。由于衰减率在此位置的周围环境中变化不大，因此受损部分的长度主要取决于流量。

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