Figure 31. Flow impact holds ice in channel 2.
ice runs in question be near the ice conveyance capacity of the particular channels.
The additional force associated with the merging of ice and water equals or
exceeds the force increment needed to cause ice to jam in the confluent channel.
1. Jamming of merging ice runs
The first mechanism suggests the following criterion for use in assessing
whether a jam will develop in one or other of the two confluent channels entering
the confluence: ice moving in one confluent channel will jam if
ΣF F′merge1 1F″merge1 = Fdrag + Fweight Fbank
Fstrength F′merge1 1F″merge1 ≤ 0
(21)
where Fdrag
=
water drag force acting against the ice,
Fweight
=
the streamwise component of weight of the moving ice,
Fbank
=