Beschreibung:
<jats:title>Abstract</jats:title><jats:p>During the past decades, several models that predict the concentration profiles after a discharge of pollutants in a river have been developed. A model that predicts nitrogen concentrations in a river has been developed and is presented in this paper. The developed model that determines nitrogen concentrations in a water stream is based on a dimensional analysis. Fundamentals of the modelling of the pollutant predictions in a water stream consist of a derivation of function dependency from expressed non‐dimension arguments. Non‐dimension arguments are stated from variables, which influence the occurrence of pollutants. The model for the prediction of nitrogen concentrations in water streams has been developed for the <jats:styled-content style="fixed-case">L</jats:styled-content>aborec <jats:styled-content style="fixed-case">R</jats:styled-content>iver (eastern <jats:styled-content style="fixed-case">S</jats:styled-content>lovakia). The differences between the nitrogen concentrations predicted from developed models and measured concentrations in the river are also discussed here.</jats:p>