4/98
SED2D-WES Version 4.3 Beta
which is applicable to the lower 15 percent of the boundary layer when
u* D
> 30
(7)
ν
where
u = mean flow velocity
D = water depth
ν = kinematic viscosity of water
b.
The Manning shear stress equation,
gun
=
*
u
(8)
CME D1 6
where
g = acceleration due to gravity
n = Mannings roughness value
CME = coefficient of l.0 for metric units and l.486 for English units
c.
A Jonsson - type equation for surface shear stress (plane beds) caused by waves and currents,
1 f w uom + fcu
u
u + om
u* =
(9)
2 uom + u
2
where
fw = shear stress coefficient for waves
uom = maximum orbital velocity of waves
fc = shear stress coefficient for currents
d.
A Bijker - type equation for total shear stress caused by waves and currents,
10
WORKING DRAFT
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