Winter operations, 1970-1971 / John C. Ayers, Norbert W. O'Hara, William L. Yocum.

Ridge C, with high blowhole cones and color evidence of extruded
sand, completes the basic shore ice structure. Over the top of
Ridge C in the left center distance a limited field of brash or
floe ice is evident. 25 January 1971.
From an overflight by Dr. O'Hara. An onshore view showing ridges
A, B, C, and D with two areas of lagoon ice and a still outer area
of floe or brash ice. With the Cook Plant in the background. 24
February 1971.

Fig. 13(74).

Fig. 14(77).

An overview from
foot, two frozen
fully developed.
the second outer

the Cook Plant visitors' center of the basic icelagoons, and two outer ice barriers when they were
Small ice cakes show in the open water beyond
ice barrier. (Ridge D). 26 February 1971.

Fig. 15(80).
Fig. 16(85).
Fig. 17(88).
Fig. 18(89).
Fig. 19(90).
Fig. 20(91).
Fig. 21(92).
Fig. 22(93).

Looking north along Ridge B at the north side of the plant site.
Ridge A at right, the lagoon and Ridge C at left. 26 February 1971.
The outer (lagoon) face of Ridge C looking south. Lagoon ice at
right. 26 February 1971.
North wall of a breach in Ridge C, natural condition. 26 February
1971.
Sawed section of the same breach wall, showing component layers
(mostly spray ice) tilting down and tapering toward the beach.
26 February 1971.
Sawed section through a layer of spray ice and iceballs in the
breach through Ridge C. 26 February 1971.
Anticlinal pressure structure in the lagoon ice about 10 meters
west of and parallel to Ridge C. Large sandy pancake ice incorporated in lagoon ice in background. 26 February 1971.
Looking shoreward from Ridge D across hummocky lagoon ice to Ridge
C. This ice gave access to Ridge D. 26 February 1971.
Looking south from the back (shoreward) side of Ridge D. Ice
blocks in the water appear to be grounded. White ice is fresh
spray ice. 26 February 1971.

Fig. 23(95).
Fig. 24(96).
Fig. 25(116).

Looking north along the face of Ridge D.
cone of a blowhole in Ridge D. Estimated
was the highest point in the local ridge.

Jon Barnes on the ice
to be 25 feet high, cone
26 February 1971.

Closeup of surface of Ridge D after sand cover had been scraped
away. 26 February 1971.
At right a large and recently active blowhole in Ridge D; in the
center the mild wave action of the day delivers slush/spray and
iceballs in a breach of the ridge. 2 March 1971.

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