(m)
(ft)
10
3
8
2
6
Iterationn Cycle:
Interatio Cycle:
4
66tth
h
1
77tth
h
88tth
h
2
99tth
h
10thh
10 t
0
12 10 3 (ft)
0
2
4
6
8
10
3 10 3 (m)
0
1
2
River Distance
Figure 4. Ice thickness convergence of successive HEC-2/ICETHK iteration cycles.
various iterations can then be made (Fig. 4), show-
(App. H and I). The HEC-2 variable names used
ing the stability of the solution.
include
By a similar process, ice-jam profiles may be
quickly produced from the file PROFILE.DAT
cross-section number
SECNO
(App. K). The current version of PLOT2, within
channel water surface elevation
CWSEL
HEC-2, is not capable of plotting ice profiles at this
VCH average channel water-current velocity
time. As an alternate method, HEC-2 SUMPO files
channel depth
DEPTH
resulting from the final HEC-2/ICETHK iteration
channel water surface slope * 10,000
10K*S
can be imported to a spreadsheet, and ice profiles
channel reach length
XLCH
made. Figure 5 is an example.
channel (ice) bottom width
CHBW
T h e output files FIN.DAT, FIRST.SMP,
elevation of left bank station
XLBEL
LAST.SMP, QP.DAT, and PROFILE.DAT are pro-
channel ice roughness
CNICE
duced each time the ICETHK program runs. To
channel ice thickness
ZITCH
save any or all of these files, they must be copied to a
ice thickness if thinning takes place
THIN
new name before the next ICETHK run.
left overbank ice thickness
ZITL
right overbank ice thickness
ZITR
left overbank ice roughness
LNICE
USING ICETHK
right overbank ice roughness.
RNICE
This section describes the actual mechanics of
These and other data may also be viewed using
using the ICETHK program. Also included are
the SUMPO option within HEC-2.
instructions on loading the program on a PC
equipped with DOS.
Output files for use with spreadsheets:
QP.DAT and PROFILE.DAT
Loading ICETHK
The file QP.DAT contains depth (DPTH), chan-
A diskette is available that contains the 26
nel velocity (VCH), channel water surface eleva-
files listed in Appendix L. (To obtain this diskette,
tion (CWSL), slope (CSLP), and channel ice thick-
please write to U.S. Army CRREL, ATTN: CECRL-
ness (ZTCH) from successive iterations. QP.DAT
IE, 72 Lyme Road, Hanover, NH 03755-1290.)
is designed for export to a spreadsheet taking the
FICETHK.EXE contains the main program. The
form shown in Appendix J. Thickness profiles for
9
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