80
3.3
R.H. Charlier and Chr. P. De Meyer
Prediction Method of Ackers-White (1973)
Based on analysis of 925 sets of flume and field data, the following empirical
formula was proposed
d I u I[Y-Yo~|
q~,o-~ K~ 35~ t--~. )
in which :
qt,c = total bed material transport
u = depth-averaged velocity
u.,o = current-related bed shear velocity
Y = particle mobility parameter
Yor = critical particle mobility parameter
n,m,K = coefficients
v = kinematic viscosity coefficient
s = specific density (= 2.65)
K = exp[2.86 In (D.) - 0.434 (In D,) 2 - 8.13]
n = t - 0.56 log (D.)
9.66
m =
+134
D.
0.23
Y~
D.o3 + 0.14
K = 0.025, n = 0, m = 1.5, Yor- 0,17
Y = ~ga3,
5.661og(lOd, a3~))
(38)
(m2/s)
(m/s)
(m/s)
(-)
(-)
(-)
(mVs)
(-)
for D.< 60
for D. < 60
for D. < 60
for D. < 60
for D. > 60