Environmental Engineering Reference
In-Depth Information
Symbol
Quantity
Unit
Dimension
Fr
Froude number
(-)
-
(m/s
2
)
LT
−
2
g
Acceleration due to gravity
G
gr
Dimensionless mobility parameter
(-)
-
h
Water depth
(m)
L
K
Error factor
(-)
-
k
Roughness height
(m)
L
k
s
Roughness height of Nikuradse
(m)
L
k
s
Grain roughness height
(m)
L
k
s
Bed form roughness height
(m)
L
k
se
Effective equivalent roughness
(m)
L
(m
1/3
/s)
L
1/3
T
−
1
k
s
Strickler coefficient
(m
1/3
/s)
L
1/3
T
−
1
k
m,
d
modified
k
m
for a canal depth
d
(Strickler)
(m
1/3
/s)
L
1/3
T
−
1
k
m,1m
reference
k
m
for a canal depth of 1.0 m (Strickler)
l
,
L
Length
(m)
L
L
A
Adaptation length
(m)
L
m
Cotangent of side slope
(-)
m
Side slope (1:
m
)
(-)
M
Momentum function
(-)
(s/m
1/6
)
L
1/6
n
Manning resistance coefficient
(s/m
1/6
)
L
1/6
n
e
Equivalent Manning coefficient
P
Wetted perimeter
(m)
L
p
Porosity
(-)
-
P
Power
(W)
(m
3
/s)
L
3
T
−
1
Q
Discharge; water discharge, flow discharge
q
Discharge per unit width of flow
(m
3
/s/m)
L
2
T
−
1
q
∗
Dimensionless unit discharge
(-)
-
(m
3
/s/m)
L
2
T
−
1
q
b
Bed load transport rate per unit width
(m
3
/s/m)
L
2
T
−
1
q
e
Equilibrium sediment discharge
(m
3
/s/m)
L
2
T
−
1
q
s
Volumetric rate of sediment transport per unit width of flow
(m
3
/s/m)
L
2
T
−
1
q
s
Sediment discharge per unit width
(m
3
/s)
L
3
T
−
1
Q
s
Total sediment discharge
(m
3
/s)
L
3
T
−
1
Q
so
Sediment discharge at upstream point
(m
3
/s)
L
3
T
−
1
q
st
Flow discharge in a stream tube
(m
3
/s/m)
L
2
T
−
1
q
sus
Suspended load transport per unit width
r
Radius
(m)
L
R
Hydraulic radius
(m)
L
Re
Reynolds number
(-)
-
Re
∗
Particle Reynolds number
(-)
-
R
g
Grain Reynolds number
(-)
-
R
v
Velocity ratio
(-)
-
S
Slope
(-)
-
s
Relative density
(-)
-
s.f.
Shape factor
(-)
-
S
f
Friction slope
(-)
-
S
o
Bed slope
(-)
-
t
Time coordinate
(s)
T
T
Excess bed shear stress parameter
(-)
-
T
A
Adaptation time
(s)
T
T
/
Q
Relative transport capacity
(-)
-
(
Continued
)
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