Influence of Suction and Blowing on Entrainment of Sand Particles

by Daniël M. Oldenziel, Proj. Engr.; Delft Hydr. Lab., Delft, The Netherlands,
Warner E. Brink, Geophysical Engr.; Geophysical Service Int. Ltd., Croydon, U.K.,

Serial Information: Journal of the Hydraulics Division, 1974, Vol. 100, Issue 7, Pg. 935-949

Document Type: Journal Paper

Abstract: The influence of suction and blowing on the rate of entrainment of sand particles was studied experimentally. For the range of grain sizes (130 - 570 μm) suction always reduced sediment transport at a constant mean flow velocity, whereas the rate of transport increased with blowing. The results were compared with the theory of Martin on the stability of a particle under the influence of pore-water flow. It was found that the coefficient, C, relating the force on the particles at the surface of the bed to the pressure gradient in the bed, varied strongly with the grain size. The influence of suction and blowing on the bed shear stress was computed with a simple kinematic model and compared with the theory of Turcotte and others.

Subject Headings: Suction | Particles | Sediment transport | Entrainment | Soil suction | Sandy soils | Grain (material) | Transport rates |

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