4/98
SED2D-WES Version 4.3 Beta
5.0
NOTATION
α1
= coefficient for the source term 1/sec
α2
C
= Chezy roughness coefficient
= concentration of sediment, kg/m3
c
CME
= coefficient of 1 for metric units and l.486 for English units
Cc
= critical concentration = 300 mg/l
Cd
= coefficient for deposition
Ce
= coefficient for entrainment
Ceq
= equilibrium concentration
$
C
= approximate concentration in an element as evaluated from the shape functions and nodal point values
of c
D
= water depth
Ds
= effective grain size
= effective diffusion coefficient in x-direction, m2/sec
Dx
= effective diffusion coefficient in y-direction, m2/sec
Dy
DT
= computation time interval
t
= time
f(t)
= time-varying characteristic
fc
= shear stress coefficient for currents
fw
= shear stress coefficient for waves
GP
= transport potential
GS
= transport capacity
g
= acceleration due to gravity
i
= number of grain size class
M
= consolidation coefficient
N
= quadratic shape functions
NE
= total number of elements
NL
= total number of boundary segments
n
= Mannings roughness value
P
= erosion rate constant
PI
= percent of bed surface covered by grain size, expressed as a function
)
(
)
= C ∆t + α 2 for the transient problem
Q
qis
= flux from source on boundary i
31
WORKING DRAFT
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