This study investigates how sporadic rainfall affects water quality in Heidelberg, Germany’s recreational lakes. Conducted in August and September 2023, the research monitored physicochemical properties and nutrient levels at five lake stations, capturing changes before and after rainfall events. Key parameters measured included dissolved oxygen, pH, conductivity, redox potential, turbidity, and concentrations of nitrates, phosphates, sulphates, zinc, and copper.
Findings: Rainfall had a significant impact on water properties. The study found that pH levels rose due to dilution, while conductivity increased because of surface runoff, which added ions to the lakes. Dissolved oxygen also saw a boost, attributed to rainfall-induced surface turbulence, which facilitates atmospheric oxygen exchange. Redox potential declined, indicating an atmospheric oxygen infusion into the lakes.
Nutrient levels displayed a dilution effect, with reductions in nitrates, phosphates, and sulphates following rainfall, suggesting a lack of upstream nutrient sources. Heavy metals like zinc and copper also decreased in concentration, showing no significant input from runoff or sediment movement. This variability across different lakes emphasizes that water quality is influenced by unique lake characteristics, land use, and geological conditions.
Conclusion: Overall, water quality improved post-rainfall, with a noted positive effect on recreational suitability. This study sheds light on the dynamic relationship between precipitation and lake ecosystems, emphasizing the importance of understanding local environmental factors to maintain water quality.
🔗 Full Text: https://www.igminresearch.com/articles/html/igmin153
🔗 DOI Link: https://dx.doi.org/10.61927/igmin153
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