2. 3D Visualization and Analysis of Topographic and Geologic Oceanographic Data in the NW Aegean Sea A. Karageorgis, P. Drakopoulou & Chr. Anagnostou

3. The EU MAST-III ELOISE Metro-Med project (Contract No: CT 960049) Collects data from the fields: In an effort to organize, analyze, compare and finally to explore the data set, we have utilized the Arc/Info GIS platform for the development of an application named “Metro-Med GIS” Physical Geological Biological and Chemical Oceanography

6. Metro-Med Multidisciplinary Cruises

7. The Working Area Marine area : Thermaikos Gulf & Sporades basin in NW Aegean Sea (39 o 00΄N - 22 o 30΄E, 40 o 40΄N - 24 o 30΄E ) Drainage basin : study the marine area as an integrated system with the surrounding land, since terrestrial input in fresh water, sediments, nutrients, pollutants is of major importance.

8. The Working Area

10. Data projection... Greek Geodetic Reference System 1987: Transverse Mercator projection central meridian λ o = 24 o scale’s coefficient = 0.9996 constant 500,000 is added to the x-axis values * The reference points use for the data transformation, produced an RMS (Residual Mean square) Error between 0.002 and 0.017

11. The area under investigation was separated in The area under investigation was separated in three zones...

12. The cartographic data base comprises the following categories - layers of information: Bathymetry Hypsometry Hydrography Political - Administrative borders Road Network Urban Area

13. The DEM of the whole area The DEM of the whole area...

15. Metro-Med Digital Bathymetric Map of the Thermaikos Gulf and the Sporades Basin Area (km 2 ) Volume (km 3 ) Shelf Basin Total 5,350430 5,2503,570 10,6004,000

27. riverine supply –proximity to the sources –water circulation –bottom topography Thessaloniki city supply stratification Factors controlling SPM distribution:

28. Particle transport and deposition transport along the western coast (SE) resuspension and deposition mechanisms closely related to the distance from the river mouths absence of detached layers towards the basin shelf acts as a sediment trap

33. Conclusions SPM major sources are the rivers Axios, Aliakmonas and Pineios SPM input is high only during the “wet” seasons SPM distribution follows the dominant cyclonic cirulation SPM settles in the shelf SPM is mainly terrigenous Sediments distribution follow in general the bathymetry Sands in the eastern and central part lack of input circulation patterns Silt deposition in fron of the river mouths Clay deposition in the basin Resuspension possibilities in the western part