Abstract
Nutrient pollution, a growing problem for most European river basins, is a priority challenge in the Danube River Basin, a river that interconnects freshwater with the marine environment. The nutrient content of the Lower Danube waters in a river area where hydro-technical works to improve navigation conditions were carried out, respectively between km 375 and km 175, was evaluated in conection with other water quality parameters and with the hydrological regime. This paper is based on the data obtained during the period 2011-2017 on water samples taken from 10 sampling sections, and the following parameters were investigated: pH, ammonia nitrogen - NH4-N, nitrites - NO2-N, nitrates - NO3-N, total nitrogen - TN, orthophosphates - PO4-P, total phosphorus - TP, Chlorophyll a - Chl �a�, all of which are correlated with water flow - Q. The results showed a significant correlation between the nutrients content, Chl �a�, and water flow, taking into account both the anthropic and climatic pressures on the aquatic ecosystem and the impact of the water body loads on the Black Sea coastal zone.
Highlights
Rivers pollution with nutrients is one of the most widespread human impacts on water resources, the water quality being affected both by the magnitude and the impact of anthropogenic activities and by the climate change [1,2,3,4,5].Waste water resulting from urban, industrial and agricultural activities is the source of most nutrients that stimulate excessive algal growth [6,7,8,9]
According to the management plan developed by the ICPDR, about 65% of the length of the Danube River was classified at risk due to nutrient pollution [21, 22]
The nutrients content was corelated with other water quality parameters, taking into account the waters hydrological regime
Summary
Rivers pollution with nutrients is one of the most widespread human impacts on water resources, the water quality being affected both by the magnitude and the impact of anthropogenic activities and by the climate change [1,2,3,4,5].Waste water resulting from urban, industrial and agricultural activities is the source of most nutrients that stimulate excessive algal growth [6,7,8,9]. Rivers pollution with nutrients is one of the most widespread human impacts on water resources, the water quality being affected both by the magnitude and the impact of anthropogenic activities and by the climate change [1,2,3,4,5]. The development of algae can physically change the structure of habitats, can lower oxygen concentration and may increase the pH of water, causing a negative impact on aquatic ecosystems [10,11,12]. Studies have increasingly been focusing on the nutrients from rivers that cause major problems that seriously affect ecosystem services and human wellbeing, nutrient pollution being a priority challenge in the Danube River Basin [18,19,20]. Nitrogen and phosphorus causes eutrophication in the NorthWest Black Sea area, and it is known that the Black Sea is one of the largest semi-enclosed marine basins on earth where rivers discharge can be evaluated [23,24,25]
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