(m)
(ft)
510
155
500
150
490
480
145
River Thalweg
470
Ice Bottom
Water Surface
460
18 10 3 (ft)
0
6
12
5 10 3 (m)
0
1
2
3
4
River Distance
Figure 5. Ice-jam profile produced by importing ICETHK output file, PROFILE.DAT, into
a spreadsheet.
sion or if you want ICETHK to take ice parame-
other executable and batch files drive the HEC-2/
ters directly from the PARA.DAT input file.
ICETHK iteration process. Also included are
HEC-2 and ICETHK should then cycle the
external files for storage of data between itera-
tions, as well as sample input and output files. The
desired number of times. Forms of output are
HEC-2 executable HEC2.EXE is provided in case
described in the previous section of this report.
your version of HEC-2 does not have the bottom-
The ICETHK summary output file FIN.DAT lists
width option. ICETHK uses the bottom-of-ice
ice thicknesses for the final and second-to-last
width variables rather than river-top width in ice
iterations, as well as notes on the stability of the
thickness calculations.
ice accumulation for individual reaches.
Because many files are created in the execution
of ICETHK, it is a good idea to create a separate
directory for the program. This directory must be
RIVER ICE MODELING
accessible to HEC-2. Copy the contents of the
WITH ICETHK
ICETHK diskette into this directory. Again, if
your version of HEC-2 has bottom-width vari-
ICETHK can be a useful tool in synthesizing
ables, you will not need to copy HEC2.EXE.
stages associated with ice jam flooding. This sec-
tion describes some important aspects of model-
Running ICETHK
ing river ice processes using ICETHK and HEC-2.
Once the program and data files are installed,
Also described are some of the model's limita-
start execution by typing MAIN, at the DOS
tions.
prompt, within the ICETHK directory. You will be
asked for the number of HEC-2-ICETHK itera-
Limitations
tions (1 to 9 is the possible range). Next you will
The ICETHK model, like HEC-2, is steady state
be asked for the name of the original HEC-2
and does not address ice motion or transport. The
data file. WINDN.DAT, TOSTON.DAT, and
model cannot predict where an ice jam will form.
FWJ4700.DAT are provided as samples. Each
ICETHK simply calculates the equilibrium thick-
input deck initially contains one IC line after the
ness for a floating ice accumulation, reach-by-reach,
first QT card. Type in the data file name with the
for a given set of hydraulic conditions and ice
DAT extension. HEC-2 should run once, then you
parameters. Although ice runs and ice jams are
will be asked if you want an interactive inputs ses-
often extremely dynamic processes, ICETHK does
10
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