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On the Transport of Sediments by Streams

Published online by Cambridge University Press:  24 October 2008

Harold Jeffreys
Harold Jeffreys
Affiliation:
St John's College
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Extract

1. The power possessed by water and air in motion of lifting and carrying solids considerably denser than themselves is familiar to all; but it does not seem to have been pointed out that classical hydrodynamics provides a simple explanation. If a solid rests on the bottom of a stream, the points of contact are points of zero velocity; and the velocity just above the solid, by the equation of continuity, must be greater than the general velocity. Hence the velocities produce high pressures under the solid and low ones above it, and the difference tends to lift the solid up. If the resulting thrust exceeds the weight of the solid in the liquid, the solid will be raised, and will be unable to rest in equilibrium on the floor of the stream.

Type
Articles
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 25 , Issue 3 , July 1929 , pp. 272 - 276
Copyright
Copyright © Cambridge Philosophical Society 1929

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References

* Quoted by Högbom, Ivar, Geografiska Annaler, 5 (1923), 130.Google Scholar

* Cf., for a sphere, Lamb, , Hydrodynamics, 1924, 174.Google Scholar

* Rept. Brit. Assoc. 1887;Google Scholar or Sci. Papers, 2, 33.Google Scholar

† U.S. Geol. Survey, Prof. Papers, 86 (1914), 26–29.Google Scholar

‡ Geog. Journ. 31 (1908), 418.Google Scholar