Author(s): F. Cioffi; F. Gallerano

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Abstract: In order to identify the optimum design and management criteria for hyperintensive aquaculture rectangular tanks, a hydrodynamic model and a water quality model have been developed. The models allow the simulation of the velocity fields in the tanks and of the concentration evolution, in space and time, of the significant species: dissolved oxygen, phytoplankton and nitrogen compounds. These models can be used to identify both the critical conditions for the survival of the reared aquatic organisms and the pollutant load discharged in the environment from the tanks. The hydrodynamic fields are obtained by solving numerically, on a symmetric vertical plane of the tank, the two-dimensional turbulent motion equations expressed in terms of vorticity and stream function; the eddy viscosity which appears in the motion equations is obtained by solving a standard k-e model. The concentration fields of each chemical and biological species are obtained by solving their mass balance equations, in which the physical, chemical and biological phenomena are represented. The models have been validated by means of laboratory and field measurements taken in hyperintensive aquaculture units in use. A number of simulations, reproducing possible critical conditions, have allowed the identification of the optimum design criteria and have functioned as a guide for the management of the hyperintensive aquaculture tanks.

DOI: https://doi.org/10.1080/00221689809498599

Year: 1998