*

> 30

ν

where

u

=

mean flow velocity

D

=

water depth

ν

=

kinematic viscosity of water

*

=

where

g

=

acceleration due to gravity

n

=

Manning's roughness value

CME

=

coefficient of l.0 for metric units and l.486 for English units

The Jonsson-type equation is for plane beds caused by waves and currents.

1⎛

+ *f * c u ⎞⎛

⎟ *u *+ *u*om ⎞

⎜

*

=

⎜

⎟

2⎜

+ *u * ⎟⎝

2 ⎠

⎝

⎠

where

ƒw

=

shear stress coefficient for waves

uom

=

maximum orbital velocity of waves

ƒc

=

shear stress coefficient for currents

1

1

*

=

2

2

4

For further information on the shear stress computation equations, see McAnally and

Thomas (1980).

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