D-R-A-F-T
EF CARD: Error Flags
Optional
Card Description: This option is NOT recommended. It is supplied here only to
be consistent with STUDH, an earlier version of SED2D.
Field
Variable
Value Description
0, C 1-2
IC1
EF
Card group identifier.
1
The hydrodynamic flow field is "adjusted" during
2
IHYDOPT
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
Execution of the program is stopped when the bed
3
DEPLIMIT
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 calculate the sediment transport based
on a hydrodynamic solution that is not valid for the
current bed geometry. When this criterion is
exceeded 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.
90 Run Control EF Card
Users Guide To SED2D-WES
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