Page 86 - Fundamentals of Geomorphology
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GEOMORPHIC MATERIALS AND PROCESSES 69
a
b
( ) Laminar flow () Turbulent flow
Surface velocity ( )
V S
Water surface Mean velocity (0.8V S )
0 0
0.5 0.5
0.6
depth
1.0 Velocity 1.0
(m) profile
Depth
1.5 1.5
Flow ‘layers’
2.0 2.0
Laminar
Bed sublayer
2.5 2.5
0 0.1 0.2 0.3 0 0.1 0.2 0.3
Velocity (m/s) Velocity (m/s)
Figure 3.8 Velocity profiles of (a) laminar and (b) turbulent flow in a river.
Mean flow velocity, v
Channel slope, s
Width, w
Wetted perimeter, P
Depth, d
Figure 3.9 Variables used in describing streamflow.
