p. 27 - 37 EXPERIMENTAL DETERMINATIONS OF THE HORIZONTAL MIXING COEFFICIENTS ALONG THE ROMANIAN WEST COAST OF THE BLACK SEA Adriana Popa, Vasile Diaconu Romanian Marine Research Institute Constanta Abstract The space-scale dependence of the turbulent mixing coefficients as determined from turbulent diffusion of dissolved substances, dispersion of finite particles and current velocity fluctuations during 1976-1980 is presented, and the deviations from the "4/3 power law" in the shallow waters are pointed out.