DISTRIBUTION OF SEA WATER POLLUTION IN THE VENETIAN HARBOUR CHANIA, GREECE.

摘要

The level of water pollution in the coastal area of the Venetian Harbour of Chania was studied in the period of February - October 2014. Surface water samples were collected from 7 sampling positions and the values of DO, BOD, COD, NO_3~-, NH_4~+, PO_4~+ fecal coliforms, E. coli and enterococci were determined. Dissolved oxygen concentration was decreased to 4mg/l during the summer touristic season, whereas the BOD and COD levels were measured at 7 mg/l each. NO_3~- concentration was in the range of 2,5-6,6 mg/l, whereas the concentrations of NH_4~+ and PO_4~+ were 0,27 and 0.5 ppm, respectively. The levels of bacteriological loads were significant throughout the study period, whereas a sharp increase in E.coli and enterococci colonies (150-500 cfu/100ml) was observed in the summer months. The sea water pollution levels indicate the need for implementation of a strategic plan for the protection of the sea water quality of the study area as the numbers of incoming visitors and the ingoing and outgoing flow of touristic and private vessels are expected to increase steadily in the future.