ICETHK User's Manual
Version 1
ANDREW M. TUTHILL, JAMES L. WUEBBEN, AND JOHN J. GAGNON
ICETHK, like HEC-2, models one-dimensional,
INTRODUCTION
steady-state flow. There is no provision for ice
ICETHK is an ice utility program that is used
motion. Figure l depicts an equilibrium ice jam
in conjunction with the HEC-2 backwater model
profile. The algorithms within ICETHK assume an
(U.S. Army 1990) to simulate an equilibrium ice
"equilibrium reach" of ice jam, where the flow is
jam profile. ICETHK uses the results of hydrau-
uniform, ice thickness is constant, and down-
lic calculations from HEC-2 with an ice cover to
stream forces acting on the ice cover are resisted
produce new estimates of ice thickness and ice
entirely by friction at the banks (Beltaos 1983). The
roughness for the reach of river being modeled.
user must specify the downstream and upstream
HEC-2 is then used to recalculate the hydraulic
locations of the jam, based on field observation of
conditions with the updated ice values from the
past jams, channel characteristics, or estimates of
previous ICETHK run. The HEC-2/ICETHK iter-
ice jam volume and length. The transition areas
ation cycles continue until the change in ice thick-
at the downstream and upstream ends (toe and
head) of the jam may not be adequately described
ness between successive iterations is acceptably
small.
by equilibrium ice jam theory. ICETHK is a con-
Transition
Transition
Uniform
Transition
Uniform
"Equilibrium"
Section
Ice Accumulation
Maximum Depth Given
by Equilibrium Section
Solid Ice
Cover
Flow
Figure 1. Schematic profile of an equilibrium ice jam. The theory underlying
the ICETHK model applies to the "equilibrium" section of the jam where ice
thickness and flow are relatively uniform.
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