74
R:H. Charlier and Ckr. P. De Meyer
in which :
q~.o
= suspended sediment transport rate
%,°
-- bed-load transport rate
I1
-- integral according to eq. (33)
I2
= integral according to eq. (34)
a
= ks = reference level
(mVS)
(mVS)
(-)
(-)
(In)
The bedload transport rate (mVS) is expressed as •
qb.c = bu.~ d5o e -°27 (p.O)
(28)
in which
U*,c
®
~t
C
C'
b
= overall bed shear velocity
= mobility parameter
= (C/C,)~ 5 = bed form factor (see eq. (5))
= overall Chdzy coefficient
= grain-related Chdzy coefficient (see eq. (5))
= coefficient (~ 5)
Because the reference level is assumed to be equal to the bed roughness (a=ks),
the ratio qs,o/qb,o can be expressed as a function of the parameter Z and ks/h,
2.11 Prediction Method of Van Rijn (1984)
Applying eq. (17), (18) and (20), the depth-integrated suspended sediment
transport rate can be computed from eq. (6), yielding
u.,o%( a lZ[o~a((d_Z)/ldZl
a
' ,a
(z
"~7
qs,cK \d-a)L,
\ z )\ZoJ+O].5~ -4z(z -°'5)ln~odZt j (29)
Equation (29) cannot be solved analytically. An approximate solution accurate to
about 25% for 0.3 %° = F udc.
(30)
(a / d) z' - (a / d) m
F =
(30
(1 - (a / d)) z'(1.2 - Z')