The Exner function, often denoted as \( \psi \), is a scalar function used in the field of fluid mechanics, especially in the study of rivers, lakes, and other open channel flows. It is particularly important in understanding sediment transport and the dynamics of riverbed profiles. In the context of sediment transport, the Exner function describes the change in elevation of the sediment bed over time as a function of sediment supply, transport capacity, and the flow conditions.
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