Ricerc@Sapienza

This paper deals with the analysis of drifter campaigns realized in two different domains, the Gulf of Mexico and the Mar Grande Basin (Italy). Relative dispersion, diffusivity, and velocity variance were estimated, identifying different growth regimes. An exponential growth of the dispersion process was detected during the initial phase of deployment, and empirical laws for horizontal diffusivity were inferred.

We present turbulent Schmidt number (Sct) estimations above three-dimensional urban canopies, where Sct is a property of the flow defined as the ratio of the eddy diffusivity of momentum (KM) to the eddy diffusivity of mass (Dt). Despite the fact that Sct modelling is of great interest, inter alia, for pollutant dispersion simulations conducted via computational fluid dynamics, no universal value is known.