Abstract
In earlier papers (Bagnold 1936, 1937
a
) a description was given of experiments made in a wind tunnel 1 ft. sq. in cross-section to examine the conditions of wind and ground surface governing the mass flow
q
of sand across open country. It was found that: (
a
) The sand movement over a loose sand surface profoundly modifies the vertical velocity distribution of the wind, and that Prandtl's expression for the velocity distribution over a roughly surface of immobile grains
v
= 5.75
V
log 30
z
/
k
(1) (where the drag velocity
V
= √(
T/p
),
z
is the height of measurement above the surface,
k
is the height above the surface at which
v
is zero―a height of the order of 1/30 of the dimension of the surface irregularity,
i. e
. the grain diameter,
T
is the surface drag and
p
the air density)
Reference1 articles.
1. P roc. Roy;Bagnold R .;Soc. A,1936
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