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Majority of existing simulation models is composed for simulate the pollution spreading (concentration) only downstream from the pollutant source. Consequence of this is that these models strictly require all the initial and boundary conditions (discharges, location and concentration of the pollutant). However, opposite problems may occur in practice: pollution concentration time courses in specific cross-section profile along a watercourse are known (e.g. based on the on-line monitoring), but pollution source loc...

General topic of this paper is numerical modelling of pollution dispersion in streams and use of some modelling approaches for the inverse task. Inverse task means a modelling technique, which is focused on the localisation of unknown pollution source. Such task is called ?inverse ?, because typical common models or equations are rather focused on the pollution spreading simulation, whereas the pollution source location is known. To solve such inverse problem various approaches can be used, but in all cases a prer...

Nowadays a typical task in water quality modelling is to simulate the pollution spreading downstream, i.e. initial and boundary conditions are known. However, in practice opposite problems may occur: pollution concentration time courses in specific locations are known (e.g. based on the on-line monitoring), but the position of the pollution source is unknown. This type of task can occur in case of accidental pollution and is named as an inverse task. Particular importance has the inverse task application in urban ...

The dispersion is one of the most important pollution transport phenomena, which is used in numerical water quality models. The dispersion rate is described by the value of the dispersion coefficient in the advection пїЅ dispersion equation. The most reliable way of determining the value of the dispersion coefficient is the field tracer experiment. The results of the field experiments are affected by various influences, which occur in the real flow conditions - one of them is the occurrence of transient storage zo...

One of the main tasks of water management is to achieve good water quality. Important auxiliary tools in this case are mathematical models that currently are incorporated in almost every numerical model, used to solve problems in everyday practice of water management and engineering. A dispersion coefficient is one of the crucial input parameters of transport processes. The paper is focused on determination of dispersion coefficients in sewers, as in prismatic and straight stream channel with relatively constant r...