Geoscience Reference
In-Depth Information
500
450
400
350
300
250
200
150
100
50
0
0.01
500
450
400
350
300
250
200
150
100
50
0
0.01
0.1
1
0.1
1
y
/
h
(
−
)
y
/
h
(
−
)
500
450
400
350
300
250
200
150
100
50
0.01
500
450
400
350
300
250
200
150
100
50
0
0.01
0.1
1
0.1
1
y
/
h
(
−
)
y
/
h
(
−
)
500
450
400
350
300
250
200
150
100
50
0.01
500
450
400
350
300
250
200
150
100
50
0
0.01
0.1
1
0.1
1
y
/
h
(
−
)
y
/
h
(
−
)
Fig. 23 Nondimensional duration of the events. QII on the
left
; QIV on the
right
. From
top
to
bottom
: E1/E1D; E2/E2D; E3/E3D. Mobile bed:
circle
; fixed bed
dark circle
Since this study is primarily concerned with the events that produce shear stress,
only sweeps and ejections will be studied. The first parameter to be discussed is the
duration of the event. Profiles of
TUu
*
/
v
, where
U
is the time-averaged longitudinal
velocity, are shown in Fig.
23
. Apart from small and unbiased deviations, possibly
