Ralph Bagnold

The Physics of Blown Sand and Desert Dunes

• Broschiertes Buch

Produktbeschreibung

THE NATURE OF THE PROBLEM THIS book results from an attempt to explain on a basis of experimental physics some of the many strange phenomena produced by the natural movement of sand over the dry land of the Earth. The subject is but one aspect of a far wider problem which is still very imperfectly grasped-the transport of solid particles of any kind by fluids in general. Here the difficulty has been, and still is, that no one branch of science has attempted to deal with the problem as a whole, or to co-ordinate the vast amount of piecemeal work by students of different outlook in many unrelated fields. The carriage of silt by rivers has received a great deal of attention from engineers. But owing to the difficulties of direct measurement, to the expense and labour of conducting full-scale experiments, and to a failure to find agreement as to the basic quantities upon which a theoretical edifice may be built, the published results are far from satisfactory. Little has emerged except empirical formulae; and these are rarely capable of reliable application to conditions other than those under which they were evolved. The drifting of snow is of direct interest to transport authorities in many countries, to meteorologists engaged in the study of rainfall, to ski-runners and to mountaineers. Yet no means has been found whereby the precipitation can be gauged, or the rate of drift related to the strength of the wind.

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Produktdetails

• Verlag: Springer / Springer Netherlands
• Artikelnr. des Verlages: 978-94-009-5684-1
• 1974
• Seitenzahl: 308
• Erscheinungstermin: 3. Oktober 2011
• Englisch
• Abmessung: 216mm x 140mm x 17mm
• Gewicht: 390g
• ISBN-13: 9789400956841
• ISBN-10: 9400956843
• Artikelnr.: 39496927

Inhaltsangabe

I The Physics of Grain Movement.- 1 Sand and Dust.- 2 The Behaviour of Sand Grains in the Air.- 3 Wind-Tunnel Observations.- 4 The Surface Wind.- 5 The Effect of Sand Movement on the Surface Wind.- 6 Confirmatory Measurements in the Desert.- 7 Threshold Wind Speed and Size of Sand Grain.- 8 Summary of the Physics of Grain Movement.- II Small-Scale Effects. Grain Size Distribution. Surface Ripples and Ridges.- 9 Grading Diagrams.- 10 Grading Changes in Non-Uniform Sand.- 11 Surface Ripples and Ridges.- III Large-Scale Effects. Sand Accumulation. Dunes. Internal Structure, Etc..- 12 Conditions for the Growth of a Sand Surface.- 13 Sand Shadows and Sand Drifts. General Factors on Which Dune Shape Depends.- 14 The Barchan Dune.- 15 The Longitudinal or Seif Dune. The Whaleback.- 16 The Internal Structure of Sand Deposits.- 17 ' Singing Sands '.