Download User`s manual for SSIIM - NO

below 1.0. If the second integer is 3, the ap term will be increased if the Froude
number is between 0.5 and 1.5.
The third integer decides the magnitude and conditions of the depth limiter invoked by
the first integer. If the integer is above zero, the limiting value is decided by a formula
in the sfdifdll.dll file, which can be coded by the user. Negative values indicate different alternative hard-coded formulas, not in the DLL. The following options for the
limiter are:
-1: the depth if the Froude number is above 1
-2: the depth * 1.1 if the Froude number is above 1
-3: the depth * the Froude number if the Froude number is above 1
-4: the depth if the Froude number is above 0.9
-5: same as option -3, except the Froude number is taken as the maximum of the cell
and its neigbours
-6: the depth if the Froude number is above 0.5
The float is a limiter on the allowable surface slope used in the determination of the
anb coefficients for the F 36 7 algorithm.
Default: F 246 1 1 0 0.1
F 249 SSIIM 2 only. An integer is read. If 1, then negative sediment thicknesses are allowed.
The feature is used to present measured bed elevation changes.
F 251 SSIIM 2 only. Different Shields curves. An integer is read. If non-zero, a lower or
higher Shields curve will be used.
F 252 SSIIM 2 only. A relaxation factor for the outflow discharge, if a zero-gradient
(update) boundary condition is used.
Default: F 252 0.9
F 256 SSIIM 2 only. Maximum sediment concentration at the bed. Default 0.1
F 260 Flocculation DLL. An integer is read. If it is above zero, the flocdll.dll file will be used
to compute flocculation of the sediments. Note that this will only work if the F 37 2
option is used.
F 261 SSIIM 2 only. Nested grid algorithm. An integer and a float is read. If the integer is 1,
the nested domain will be coupled with the coarse grid when computing water flow. If
the integer is 2, the coupling will also be applied for the sediment concentrations. The
float is a relaxation coefficient for the interpolation. Its value is between 0 and 1.
F 264 SSIIM 2 only. Variable bed sediment density algorithms. An integer is read. If it is
above 0, then it will be used by the functions in the vdmldll.dll file, computing variations in the bed sediment density. If it is -1, then a hard-coded algorithm is used.
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