COLD REGIONS TECHNICAL DIGEST NO. 96-1
8
re
Sho
Fractured
Open Water
Ice Cover
on River
3. Schematic showing
fractured ice area that
Sh
ore
contributes to the ice
loading on a wide lake
ice boom.
0
1000 ft
0
305 m
fw = γ water yiceSf 5B
(2)
where γwater = the specific weight of water
yice = the average channel depth above the isoline of
maximum velocity
B = the average width of the ice cover on the reach
extending 35 boom widths upstream of the
structure.
ni3/2
1
yt =
= 3/2
3/2
-3/ 2 t
yice
y
nb + ni
ni
1 + n
b
where nb = the Manning's roughness of the channel bed
ni = the Manning's roughness of the ice cover
yt = the average under-ice flow depth.
2
V 2 nc
Sf =
(in English units)
4/ 3
2.22 Rice
where V = average under-ice water velocity
nc = the composite roughness for an ice-covered channel
Rice = the hydraulic radius.
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