At the Institute of Marine Research, we use these models to simulate transport of eggs, fish larvae, salmon lice, virus and bacteria, nutrients, algae, radio activity, pollution, micro plastic and waste from mining activities. To be able to model particles realistically, we need to have access to output from a circulation model with sufficient resolution in time and space.
Dispersion models can be divided into two main classes: concentration-based and particle-based. Concentration-based (Eulerian) models solve an advection and a diffusion equation for concentrations, in the same way which is done for salinity and temperature in the circulation model. The alternative is particle-based (Lagrangian) models, where particles drift passively with the modeled current. Extra dispersion can be added to these particles by giving them an additional random displacement, which is commonly named random walk. Vertical processes like buoyancy, mixing and active migration can be added to the vertical displacement. We mainly use particle-based (Lagrangian) models at the Institute of Marine Research.
Published: 19.03.2019 Updated: 12.04.2021