-14-
1
I
I
I
,,
1
1
I
530
.-
500
400
300
c“’
200
100
c
I
o
I
I
5
I
1
10
I
I
15
I
J
20
.
Time, s
Figure 4.
An example of a dust concentration pulse on the downwind side of
dirt
road
following
passage of a light motor vehicle,
a one-lane
11:05 a.m., May 15, 1978 (wind speed 4.5 m S-l).
s
..
(_