In. Sediment Transport
77
q~.o
= current-related suspended load transport
(m2/s)
u
= depth-averaged velocity
(m)
dso
= median particle diameter of bed material
(m)
dso, ds4, dgo
= diameters of bed material
(m)
d
= water depth
(m)
k~
= overall bed roughness height
(m)
g
- acceleration due to gravity
(m/s 2)
a
= reference level
(m)
1
(a = -- A, or a = k~, a minimum = 0.01 d)
2
A
= bedform height
(m)
co
= maximum concentration = 0.65
(1)
s
= specific density = 2.65
(-)
v
= kinematic viscosity coefficient
(mVS)
r:
= Von Karman constant = 0.4
(-)
When the bed-load transport and the suspended load transport are known, the
total load transport of bed material can be determined by addition (qt = qb + q0.
The ratio of the suspended and total load transport can be expressed as :
qs
qs
1
qt - qb +q~- qb /qs + 1
(33)
For reasons of simplicity the bed load transport is here defined as :
qb = aCa U a
(34)