The environmental state of freshwater resources in Greece (rivers and lakes) |
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| Authors: | N T Skoulikidis I Bertahas T Koussouris |
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| Institution: | (1) Institute of Inland Waters, National Centre for Marine Research, Ag. Kosmas, Helleniko GR-16604 Athens, Greece Tel.: +30>9829239 · Fax: +30>9811713 · e-mail: nskoul@posidon.ncmr.ariadne-t.gr, GR |
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| Abstract: | The dominant factor regulating Greek riverine dissolved inorganic solid concentrations is chemical weathering, which depends
on catchment climate and petrography. The majority of Greek rivers are moderately polluted and only a few of them show significant
human impact and an increase in pollutant concentrations over time. Due to droughts in recent years and anthropogenic influence,
the mean annual riverine dissolved solid concentrations exhibit a general interannual increase and significant long-term variations
in their intra-annual hydrochemical fluctuations. The shallow Greek lakes are eutrophic, while the deep ones are oligo-mesotrophic.
The majority of the lakes are monomictic and show summer thermal stratification, while the shallow ones are characterized
by anoxic hypolimnetic conditions. Catchment petrography is not a dominant factor in the composition of lake waters since
biochemical processes prevail. The majority of Greek lakes are also moderately polluted and are characterized by phosphorous-limited
photosynthesis.
Received: 17 March 1997 · Accepted: 16 January 1998 |
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| Keywords: | Greek rivers Greek lakes Hydrogeochemistry Intra-annual and interannual hydrochemical variations Flushing Freshwater pollution Eutrophication Biogeochemical processes |
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