Abstract
A 3-D hybrid flow/transport model has been developed to predict the dispersal of oil pollution resulting from river discharges. The transport module of the model takes predetermined current and turbulent diffusivities and uses Lagrangian tracking to predict the motion of individual particles (droplets), the sum of which constitutes hypothetical oil spills. Currents and turbulent diffusivities used in the model have been generated by a numerical ocean circulation model (POM) implemented for the Caspian Sea. The basic processes affecting the fate of the oil spill are taken into account and parameterised in the transport model. The process of evaporation is modelled with a new technique based on the pseudo-component approach. The model is used to simulate a continuous oil release from the Volga river into the coastal waters of the north part of the Caspian Sea. Oil slick movement and risk of contamination of the coastline by beaching oil spills are illustrated for different wind conditions.
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