less than 16,000 ppm (Brownlie, 1981). The equation applies to sand ranging from 0.062 to 2.0 mm.

Brownlie's (1983) sediment transport equation is as follows:

&0.3301

R

1.978

0.6601

C ' 7115 C F (Fg & Fg )

Sf

(5.14)

D50

o

where:

Fg ' 4.596 J(c0.5293 S f&0.1405 Fg&0.1606

(5.15)

o

where: C

=

sediment concentration (ppm);

CF

=

coefficient for field data; CF = 1 for lab data and 1.268 for field data;

D50

=

median grain size of the sediment particles;

Sf

=

slope of the energy grade line;

R

=

hydraulic radius;

*c

=

critical Shields parameter; and

(d84/d16)

g

=

The critical Shield's parameter is calculated by Eq. (5.16), as defined by Brownlie:

J( ' 0.22Y % 0.06(10)&7.7Y

(5.16)

c

where:

&0.6

Ds&D

(5.17)

Y'

Rg

D

where: s = density of the sediment particles;

= density of water; and

Rg = grain Reynolds number defined by the following equation:

3

gD50

(5.18)

Rg '

<

where:

= kinematic viscosity of water;

D50 = median grain size; and

g = acceleration due to gravity.

178

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