Genesis And Development of Sand Formations On Marine Coasts

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Of these operating factors the force and direction of the wind, the sand shower, the eddy in the lee of any obstacle, the gravity, the configuration of the surface, and the moisture are the principal ones. If the dune is formed at a certain constant sum-total of these factors, it retains its form as long as these factors are constant.
THE SCULPTURAL FORM OF DUNES.
The forms of dunes have a greater variety than those of ripples, because a dune is the result of many changing winds. While the dune
...s do not owe their origin to the action of the sand grains, like the ripples, still rippling plays a part in the shaping of every dune. Eeversible winds produce dunes having both front and back slope very steep. The first effect of reverse of winds is to turn the top of the dune. !) During strong winds the troughs are always deeper. 2 ) On a hard ground, the windward slope can be as steep as the angle of rest, in case the sand supply fails and tne wind is strong. If such is the case the dunes are widely separated.

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