Electrical Conductivity as a Tracer for Seasonal Reverse Flow and Transport of Trace Organic Contaminants in River Spree

IF 3.2 3区 地球科学 Q1 Environmental Science
Christoph J. Reith, Jörg Lewandowski, Anke Putschew, Tobias Goldhammer, Josefine Filter, Stephanie Spahr
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Abstract

Climate change, population growth, urbanisation and water pollution will exacerbate the closely linked challenges of water quantity and water quality. The River Spree in Berlin, Germany, experiences recurrent low flow conditions in summer with seasonal flow reversals in certain sections of the river. This reverse flow leads to the transport of treated wastewater to upstream sections of River Spree and possibly to the introduction of treated wastewater into Lake Müggelsee, which is located upstream of the city centre and important for drinking water production via bank filtration in Berlin. A better understanding of the flow and contaminant dynamics in River Spree is required, but field data on the reverse flow are still lacking. In 2022 and 2023, we collected surface water samples to quantify major ions and trace organic contaminants. Over a period of nine months in 2023, we also measured the specific electrical conductivity at six locations with a temporal resolution of five minutes. During summer, the specific electrical conductivity increased at the sampling locations in River Spree upstream of the mouth of the wastewater-impaired River Erpe. The specific electrical conductivity proved to be an indicative parameter for the seasonal dynamics of reverse flow periods. During reverse flow, we observed increased concentrations of wastewater-derived trace organic contaminants, many of which correlated positively with the specific electrical conductivity. Strong differences in the reverse flow intensity between 2022 and 2023 indicate that both precipitation and discharge of the River Spree upstream of Lake Müggelsee have a strong influence on the reverse flow. This study demonstrates the applicability of easy-to-measure specific electrical conductivity as a proxy for hydrological conditions and chemical water quality.

Abstract Image

电导率作为施普雷河中微量有机污染物季节性逆流和迁移的示踪剂
气候变化、人口增长、城市化和水污染将加剧与水量和水质密切相关的挑战。德国柏林的施普雷河在夏季经历了周期性的低流量状况,在河流的某些部分出现了季节性的流量逆转。这种反向流动导致处理过的废水被输送到施普雷河的上游,也可能导致处理过的废水进入位于市中心上游的m格尔塞湖,该湖通过柏林的河岸过滤对饮用水生产很重要。需要更好地了解施普雷河的流动和污染物动力学,但仍然缺乏逆向流动的现场数据。在2022年和2023年,我们收集了地表水样本,以量化主要离子和微量有机污染物。在2023年的9个月里,我们还以5分钟的时间分辨率测量了6个地点的特定电导率。夏季,在埃尔佩河河口上游施普雷河采样点,比电导率呈上升趋势。比电导率被证明是逆流周期季节性动态的指示参数。在逆流过程中,我们观察到废水衍生的微量有机污染物浓度增加,其中许多与比电导率呈正相关。2022年和2023年逆流强度差异较大,表明梅格尔湖上游施普雷河的降水和流量对逆流的影响较大。这项研究证明了易于测量的比电导率作为水文条件和化学水质的代理的适用性。
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来源期刊
Hydrological Processes
Hydrological Processes 环境科学-水资源
CiteScore
6.00
自引率
12.50%
发文量
313
审稿时长
2-4 weeks
期刊介绍: Hydrological Processes is an international journal that publishes original scientific papers advancing understanding of the mechanisms underlying the movement and storage of water in the environment, and the interaction of water with geological, biogeochemical, atmospheric and ecological systems. Not all papers related to water resources are appropriate for submission to this journal; rather we seek papers that clearly articulate the role(s) of hydrological processes.
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