摘要：Impact of climate change on the water quality of the danube river
lower sector.The paper highlights the effects of climate change on water quality
of the Danube River lower sector. The impact of climate change on the water
quality of the lower Danube sector was assessed by analysing the multiannual
variation of the oxygen and nutrient parameters concentrations and the correlation
with the water temperature for the period 1996-2014. From the physico-chemical
point of view, the parameters studied are: water temperature, dissolved oxygen,
biochemical oxygen demand (BOD5), nitrates, ammonium, nitrites and
orthophosphates. This multiannual variation was also analysed at the level of the
12 months (January-December), corresponding to the studied period. Based on the
monthly multiannual trends highlighted for water temperature, their effect on the
parameters of the oxygen and nutrients regime has been studied and has been
interpreted taking into account the processes of the oxygen, carbon, nitrogen and
phosphorus cycles, respectively the oxidation of biodegradable organic
compounds, nitrification-denitrification processes and phytoplankton production.
From the perspective of the hydrological regime, the variation of the oxygen and
nutrient parameters with the extreme hydrological regime for the years 2003 and
2006 was evaluated.
