Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. XIV
Written by Ana Bianca PAVEL, Laura DUTU, Florin DUTU, Irina CATIANIS, Gabriel IORDACHE, Catalina GAVRILA
The aquatic ecosystems of the Danube Delta are highly vulnerable to ecological pressures caused by natural and anthropogenic factors. This study investigates the surface water quality along the Sfântu Gheorghe Branch, (km 85- km 15), including control sections such as Mahmudia Meander, Uzlina Lake, Isac Lake, Dunavăț Meander, Dranov Meander, and Ivancea Meander. Surface water samples were collected from 58 locations during spring and autumn (May and September 2024). Physico-chemical parameters were measured in situ using the multiparameter EXO2 probe. Key indicators assessed included water temperature, pH, dissolved oxygen, chlorophyll "a", conductivity, total dissolved solids, salinity, turbidity, and redox potential (ORP). The results revealed generally stable seasonal and spatial trends, with most parameters falling within Class I and II water quality categories, as defined by Romanian Order 161/2006. Noteworthy findings include well-oxygenated waters (>5 mg/L DO), low chlorophyll "a", concentrations (<25 μg/L), and stable pH values, all indicative of good to very good ecological status. Variations in turbidity and ORP were primarily localized and attributed to sediment resuspension or flow dynamics. Overall, the findings suggest that the monitored sections of the Sfântu Gheorghe Branch maintain resilient freshwater conditions, with limited signs of ecological degradation.
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