By J. R. L. Allen (auth.), J. R. L. Allen (eds.)
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Extra info for Principles of Physical Sedimentology
403 and N = 5 (Fig. 10). The other end member (Fig. 494 and N = 9, is made by translating one hexagonal layer of spheres over the other in a direction parallel with a line drawn through the midpoints of opposite sides of the hexagon. Whereas the cubical and rhombohedral unit cells cut off segments totalling one whole sphere, those representing hexagonal pac kings enclose two whole spheres. ~ • •• • • • n ~ 10 12 Co·ordination. 13 Co-ordination versus concentration in known regular packings of equal spheres.
In contrast, the so-called hydraulic methods, modern as well as classical, describe the particle volumetrically. The pipette and hydrometer methods, and the sedimentation tower, all depend on the fall velocity of a particle, a function partly of the volume. In the Coulter counter, size is assessed as the extent to which the grain reduces the volume of an electrolyte-filled space carrying an electric current. Having obtained a measurement of particle size, we next require a size classification for the purpose of description and communication.
12), carrying sand far out over ocean and lake floors, and the avalanches that sweep talus slopes and the leeward sides of desert dunes and dunes shaped by river and tidal currents (Ch. 5). Avalanche deposits are known to be relatively loosely packed (Denekamp and Tsur-Lavie 1981), a result with important implications for their load-bearing capacity. 23 A jar half-filled with dry sand tilted at an angle steep enough for avalanching. tents. Turn the jar back so that the surface of the sand becomes horizontal, as shown by a spirit level, and mark on the paper the place where jar and table touch.