APPENDIX A. CONVENTIONAL INPUT FILE TO ICETHK: PARA.DAT
INPUT PARAMETERS FOR ICETHK-FORTRAN
Interactive inputs session ? (l. = yes, 2. = no)
2.
RAM(1)
Unused parameter
Width-smoothing option ? (l. = yes, 2. = no)
1.
RAM(2)
2.
RAM(3)
Initial ice conditions (for all cross sections)
Initial ice thickness (ft)
(ITHICK}
1.50
RAM(4)
Initial ice roughness (Manning's n)
(NOLD)
0.025
RAM(5)
Unused parameter
1.
RAM(6)
Water depth above floodplain at which ice
goes overbank (No. of ice thicknesses) (XTo)
1.5
RAM(7)
Coefficient related to internal
()
friction of ice accumulation
1.2
RAM(8)
(e)
Ice pack porosity
0.5
RAM(9)
(Ci)
Cohesion factor for ice (0 @ breakup)
0.
RAM(10)
Maximum non-eroding velocity (ft/s)
(VCRIT)
5.0
RAM(ll)
(Si)
Specific gravity of ice
0.916
RAM(12)
Maximum ice thickness increase allowed
(DEL T)
in a single iteration (ft)
3.
RAM(13)
Unused parameter
2.
RAM(14)
Ice roughness (Select one of the 4 alternatives):
1.
RAM(15)
(NFLG)
1. ICETHK calculates n (no user input).
2. ICETHK calculates n (user estimates size).
3. User estimates Manning's n directly.
4. Retain n values from the previous HEC-2 run.
Overbank ice (Select one of the 5 alternatives):
4.
RAM(16)
1.
No ice in overbanks.
2.
User-defined overbank ice thickness.
3.
Overbank ice thickness = channel ice thickness.
4.
Overbank ice determined by ICETHK.
5.
Retain thickness from previous HEC-2 run.
Unused parameter
1.0
RAM(17)
Roughness multiplier
1.00
RAM(18)
If zero, differential roughness multipliers
(ρ)
Density of water (slugs/ft3)
1.94
RAM(l9)
2)
(g)
Acceleration due to gravity (ft/s
32.2
RAM(20)
Freezeup or breakup jam? 1 = freezeup
(JTYPE)
2 = breakup
2.0
RAM(21)
Employ ice-smoothing option? l = yes, 2 = no
1.
RAM(22)
Ice redistribution threshold (ISDEL). If change
3.
RAM(23)
in thickness between two adjacent sections is
> ISDEL, then ice thickness will be smoothed.
Depth factor (DFACT). Limits maximum shoving
0.8
RAM(24)
thickness to DFACT * DEPTH.
15
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