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New PDF release: Aeolian Sand and Sand Dunes

By Kenneth Pye

ISBN-10: 3540859098

ISBN-13: 9783540859093

ISBN-10: 3540859101

ISBN-13: 9783540859109

It is greater than part a century because the book of R. A. Bagnold’s vintage publication The physics of blown sand and wilderness dunes, and it's a tribute to the standard of Bagnold’s paintings that a few of the basic rules which he constructed - major legitimate this present day. His publication is still crucial interpreting for any severe s- dent of aeolian tactics. notwithstanding, the earlier 20 years have noticeable an explosion within the scale of analysis facing aeolian shipping procedures, sediments, and landforms. a few of this paintings has been summarized in overview papers and edited convention complaints, yet this e-book offers the rst try to overview the total eld of aeolian sand examine. necessarily, it has now not been attainable to hide all - pects in equivalent intensity, and the stability of integrated fabric clearly re ects the - thors’ personal pursuits to a signi cant measure. although, our target has been to supply as vast a standpoint as attainable, and to supply an access aspect to an intensive mul- disciplinary scienti c literature, a few of which has no longer been given the eye it merits in prior textbooks and evaluate papers. Many examples are drawn from present released paintings, however the booklet additionally makes broad use of our personal study within the center East, Australia, Europe, and North the US. The booklet has been written mostly to be used through complex undergraduates, po- graduates, and extra senior learn employees in geomorphology and sedimentology.

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Extra resources for Aeolian Sand and Sand Dunes

Sample text

This temperature gradient, known as the super adiabatic lapserate, causes instability during daytime in the form of an uprush and overturn of hot and very light surface air, with cooler air aloft seeking to fill the vacuum thus produced (Bagnold 1953b). The air layer in which this compensatory process occurs is 22 2 The Nature of Airflow called the mixing layer, and it is capped by an inversion layer (Fig. 6a). Mixing allows the higher momentum of fast-moving upper air layers, which are subject to little frictional retardation, to be brought down to surface level, thereby causing the highly turbulent surface winds that characterize desert dune fields during hot summer afternoons (Schempf 1943).

198)]. Winter winds result from dynamic lows with widely varying trajectories, bringing the degree of steadiness down to 56%. The strength of the sea-breeze is determined by the temperature difference between land and sea. Therefore, the resultant wind velocities are relatively low. 5 m above the sand dunes. The velocity of winds associated with cyclones is much higher (Fig. 12). The coastal sand dunes in Sinai are shaped mainly by the strongest winds but the effect of the sea-breeze is also imprinted on them (Tsoar 1978).

The velocity of winds associated with cyclones is much higher (Fig. 12). The coastal sand dunes in Sinai are shaped mainly by the strongest winds but the effect of the sea-breeze is also imprinted on them (Tsoar 1978). In Baja California, the sea-breeze is effective the whole year round; the maximum mean velocity, also of 12 m s−1 , occurs in mid-afternoon during summer; during winter, the pressure gradient is less developed and the afternoon breezes are lighter (Inman et al. 1966). At night, the land surface temperature drops more rapidly than the sea surface temperature, resulting in the creation of a seaward pressure gradient which induces an offshore land-breeze (Flohn 1969).

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Aeolian Sand and Sand Dunes by Kenneth Pye


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