A numerical model to simulate the dispersion of particle-reactive tracers in Cádiz Bay (SW Spain) has
been developed. It includes a hydrodynamic submodel to provide water currents, a sediment transport
submodel, which provides suspended matter concentrations and sedimentation rates and the pollutant
dispersion model. Pollutant exchanges between the liquid and solid phases are described in a dynamic
way, using kinetic transfer coefficients. Results of the hydrodynamic and sediment transport models have
been compared with observations. The contamination of sediments of the bay by fallout 137Cs has been
simulated. The existence of an accumulation area in the inner bay, found in field measurements, has been
reproduced by the model. Dispersion experiments for Zn and 226Ra have also been carried out. Flushing times of the inner bay have been finally determined through numerical experimentsMinisterio de Ciencia e Innovación CTM2009-14321-C02-01Ministerio de Ciencia e Innovación CTM2009-14321-C02-0
