NL

=

total number of boundary segments

n

=

Manning's roughness value

P

=

erosion rate constant

PI

=

percent of bed surface covered by grain size, expressed as a function

Q

=

for the transient problem

qis

=

flux from source on boundary i

=

water density

L

=

density of the failed layer

S

=

source term

=

thickness of the failed layer

T1

t

=

time, sec

=

characteristic time

tc

to

=

time zero

=

time, 1 year

t1

=

bed share stress

=

critical shear stress for deposition

d

=

critical shear stress for particle erosion

e

=

bulk shear strength of the layer

s

u

=

flow velocity in x-direction, m/sec

=

maximum orbital velocity of waves

uom

=

shear velocity

u*

v

=

flow velocity in y-direction, m/sec

=

kinematic viscosity of water

Vs/(Cc)4/3

=

Vk

=

fall velocity of a sediment particle

Vs

V

=

mean flow velocity

x

=

primary flow direction, m

y

=

direction perpendicular to x , m

=

local coordinate

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