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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v36.i1.50
pages 80-95

Incipient Motion Criterion for Plane Bed Channels

Achanta Ramakrishna Rao
Department of Civil Engineering, Indian Institute of Science, Bangalore-560012, India
Bimlesh Kumar
Assistant Professor. Department of Civil Engineering, Indian Institute of Technology, Guwahati-781039, India


A new criterion for incipient motion relating Froude number and friction slope with the relative density of sediment particles in fluid is presented in an explicit manner without involving particle size. The new criterion also explains the resistance characteristics at incipient motion. Based on the criterion developed, a procedure to design the plane and stable alluvial channel beds under uniform flow conditions is given. In this procedure any two of the four basic design variables viz., water discharge, flow depth, channel slope and bed material size are sufficient to evaluate the remaining two variables in such a way that the bed particles are stable.

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