The topic of this contribution is accidental releases modelling. The departure hypothesis is that reservoir stratification divides the mass of water into three characteristic layers: upper layer (epilimnion), intermediate layer (metalimnion) and deep layer (hypolimnion). It is assumed that mass and heat transfer is practically impossible between these layers. Box-type models have been developed. The Box-type models treat the entire body of water, or a section of the water body, as composed of homogeneous compartments. Some examples of Box-type models are presented and applied to Spanish reservoirs with different hydraulic/hydrological characteristics. The models provide downstream pollutant concentration changes with time from releases at different upstream points of the hydrological system.
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