4/98
SED2D-WES Version 4.3 Beta
EF CARD
ERROR FLAGS
EF CARD
Not required
Field
Variable
Value
Description
0,C1-2
IC1
EF
Card group identifier
1
2
IHYDOPT
The hydrodynamic flow field is "adjusted" during the
SED2D run such that as the bed moves up and down the
depth of flow is changed and the velocities are changed to
preserve the same unit flow as was calculated by RMA2.
This option is NOT recommended and is supplied here
only to be consistent with earlier versions of STUDH. Two
types of errors occur when using this option 1) the flow field
is no longer a true solution to the shallow water equations,
and thus mass is not conserved according to the finite
element formula; 2) as sediment deposits in backwater areas
this adjustment will cause velocities to increase over the
sediment bed which may artificially reduce the rate of
deposition, or even erode the newly deposited bed.
Advanced users: go ahead and use it, but be aware.
0
No adjustment of the hydrodynamic solution is performed
during the SED2D run. The implicit assumption of the
model is that the change in the bed geometry is small
enough that it does not significantly affect the flow field.
When significant erosion or deposition does occur, the user
should stop the SED2D run and rerun RMA2 using the new
bed geometry generated by SED2D. (See the definition of
DEPLIMIT below to establish a stopping criterion). This is
the default value.
≥0
3
DEPLIMIT
Execution of the program is stopped when the bed change
(due to either erosion or deposition) at any node exceeds
DEPLIMIT*(the water column depth at that node). This
check prevents the user from continuing to caculate the
sediment transport based on a hydrodynamic solution that is
not valid for the current bed geometry. When this criterion
is exceed the user should re-run RMA2 using the new bed
geometry generated by SED2D.
<0
Default = 0.25
NOTE: If no EF card is present the default values will be assigned.
50
WORKING DRAFT
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