Bed shear stress
From BAWiki
Definition
The exerted force by the flow direction related to the unit area of the river bed. (Integral of shear and pressure effects on the individual soil asperity / grains).
Synonyms
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Source
translated from "Glossar für das Forschungsprogramm KLIWAS, Mehling, Andrea et al., Bundesanstalt für Gewässerkunde, Koblenz 2011"