Chapter 2 concluded that the calculation of spatio-temporal distribution of major components of a lagoon’s hydrogeomorphological unit and biocoenose is important for the description of the structure and function dynamics (productivity and carrying capacity) of the lagoon system and, consequently, for sustainable management. This concept is required to understand the transport phenomena that describe the evolution of properties due to fluid motion (advection) and/or molecular and turbulent dynamics (diffusion). In the case of turbulent flows the small-scale motion of the fluid particles is actually random, and this nonresolved advection is also treated as diffusion (eddy diffusion).