Advanced Numerical
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Advanced Numerical Modeling

Presentation

Numerical modeling is a mathematical representation of the physical and chemical mechanisms determining the development of pollutant concentrations discharged into the seawater receiving body. It involves the prediction of water pollution using mathematical simulation techniques and determines the position and momentum of pollutants in a water body taking into account ambient conditions.

In the study of brine discharged into receiving waters, there are two regions with different behaviour of the effluent: the near and the far field region.

The Near field region is located in the vicinity of the discharge point and is characterized by initial mixing, which depends on the brine discharge configuration design and the physical effluent and ambient properties. Higher dilution rates are reached at the near field, due to the turbulence effects created by the shear layer because of the differences of velocity between the jet and the ambient. Flow and mixing characteristics are dominated by small scales (~meters and ~minutes).

The Far field region is located further away from the discharge point, at which the brine turns into a gravity current that flows down the seabed. Mixing depends on the ambient conditions and the difference of density between the hypersaline plume and receiving waters. Flow and mixing characteristics are dominated by large scales (~kilometers and ~hours).