Das Projekt "Turbulentes Mischen bei sehr hohen Reynoldszahlen in der Bosporus Meeresstraße" wird vom Umweltbundesamt gefördert und von Universität Erlangen-Nürnberg, Department für Chemie- und Bioingenieurwesen, Lehrstuhl für Strömungsmechanik durchgeführt. A well-defined natural turbulent shear layer flow exists between the counter-flowing currents in the two straits connecting the Marmara Sea to adjacent seas, namely the Bosphorus and Dardanelles (these domains defining the limits of the Turkish Straits System, TSS), due to the density difference between the Aegean and Black Seas. For example in the Bosphorus Strait the heavier, more salty Aegean water flows in the lower layer towards Black Sea and the lighter Black Sea water flows in the upper layer towards the Marmara Sea. These two currents generate a shear layer with almost constant velocity gradient at the middle depth of the strait with a thickness of about 10 m or larger. Within this shear layer, turbulent mixing of scalar quantities like salt and heat takes place. The Reynolds number of turbulence is expected to attain very high values (3000). As a result of very high Reynolds number, Peclet number for temperature and salinity fields are also very high in the mixing layer. The constant velocity gradient, the high Reynolds number state of the flow and the mixing of two scalars (temperature and salinity) make the Bosphorus strait a unique natural laboratory ...