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ECOLOGICAL STATE ASSESSMENT OF THE DANUBE DELTA
Abstract
The paper presents the results of the water quality of the St. George branch, one of three Danube River distributaries, using the combined physical and chemical analyses from June 2017. Three cutoff meander reaches (the Mahmudia, Upper Dunavat and Lower Dunavat meanders) were selected to assess the water ecological state. The cut-offs of the meanders by navigational canals since 1984-1988 caused significant changes in the distribution of the water discharge. Water samples were acquired throughout several cross-sections of both natural and artificial canals of the three rectified meanders, in order to investigate the physical and chemical characteristics of the water. The analyse of the physical and chemical parameters, such as water temperature, conductivity, pH, dissolved oxygen, degree of mineralization, nitrates, nitrites, phosphates, suspended sediments, sulphate, chlorophyll -a-, hydrogen sulfide, etc., has shown the predominance of the good ecological state of the water for nitrites and nitrates and lowquality state for phosphates. The water quality assessment was made according to Order 161/2006 [1]. The conclusions regarding the ecological state of the study area could be drawn by observing the water quality variations as conditioned by the position of the sampling points and distance to the main channel.
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References7
Order 161/2006 of Ministry of Environment and Water Management � Ecological status of water bodies.
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