Department of Geography, Harokopio University of Athens, 70 El. Venizelou Str., P.O. Box 17671, Athens, Greece

Department of Geography, Harokopio University of Athens, 70 El. Venizelou Str., P.O. Box 17671, Athens, Greece

Institute of Inland Waters, Hellenic Centre for Marine Research, P.O. Box 712, 19013, Anavyssos Attikis, Greece

Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki, P.O. Box 54124, Thessaloniki, Greece