Author(s): H. P. Morvan; D. M. Hargreaves
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Keywords: No Keywords
Abstract: The ability to compute mean wall and bed shear stress values independently in river channels has been investigated for over 75 years, with one of the first proposals on how to do so conceptually attributed to Leighly (1932). Various methods and simplifications have followed, by Keulegan (1938) and Einstein (1942) for example, but it is only more recently that a general formulation (Guo and Julien, 2005) and an accompanying solution methodology (Cacqueray et al., 2009) have successfully emerged. Cacqueray et al. (2008) specifically investigated smooth rectangular channels but the present contribution is extending their work to include considerations on trapezoidal channels and roughness. As in the original work by Cacqueray et al., the present contribution relies on detailed computational fluid dynamics simulations as well as on the implementation of a division line algorithm which permits the computation of the various shear stress components, including secondary currents and shear stress along the division line. Some of the predictions are compared against published data before leading to further analysis on the behaviour of wall shear stress.
Year: 2009