Experimental determination of melting rates of ice moving in seawater

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Author
Clifford, William Francis
Erman, Reginald Joseph
Date
1979-03Advisor
Fuhs, A.E.
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Show full item recordAbstract
Large, fresh-water ice blocks (0.5m X 1.25m X 5m) were
towed in Monterey Bay at speeds in range from 0.7 to 1.2 knots,
The objectives of the experiments included measurement of
gross regression rates of ice surfaces, wake temperature,
turbulent thermal boundary layer, ice interior temperature
profile, and observation of shape changes over the melting
period. The research was conducted over a period from
October 1977 to January 1979. The measured regression rates
at several points on the ice blocks were compared to theoretical
predictions using a turbulent flow ice ablation model
developed by Dr. Owen Griffin of the Naval Research Laboratory
Griffin's model predicted a regression rate of 280ram/hr
compared with the measured value of 26 0mm/hr at a selected
point. Temperature profiles in the ice interior and ice-water
boundary layer -were used in a one-dimensional energy balance
across the melting interface. Ice ripples were observed on
all ice block tests. The ripples are important for both heat
transfer and drag considerations. The wavelengths of the
ripples were measured and the average wavelength determined.
The measured average wavelength was 6.1 inches compared to
the theoretical average predicted by Tatinclaux and Kennedy
of 5.8 inches for a selected experiment.
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