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Summarized in the paper are the author’s studies on incipient motion of sediment in recent 40years.In addition to the forces of gravity,drag and lift,the cohesive force and the additional static pres-sure are important for fine particles.The relations between three stages of incipient motion are defined byuse of instantaneous velocity.Formulas for initial velocity and critical shear stress are given and overallverified by the author’s and others’experimental data.
Summarized in the paper are the author’s studies on incipient motion of sediment in recent 40years. In addition to the forces of gravity, drag and lift, the cohesive force and the additional static pres-sure are important for fine particles. The relations between three stages of incipient motion are defined byuse of instantaneous velocity. Formulas for initial velocity and critical shear stress are given and overall verified by the author’s and others’experimental data.