Short term motion analysis of icebergs in linear waves

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Journal titleCold Regions Science and Technology
Pages247258; # of pages: 12
AbstractThe need for the analysis of the motion of icebergs in waves is presented and the possible interaction effects between the iceberg and waves as well as its interaction with offshore structures is briefly discussed along with the hydrodynamic aspects involved in the analysis of wave induced motions of icebergs. A combined theoretical and experimental study for the estimation of the first order wave induced motions in surge and heave of a free floating iceberg in a regular wave field is presented. The theoretical model is based on the mathematical formulations of Garrison (1979) and Standing (1979) which employ a three dimensional source distribution technique. The computed model results have been compared with the previous analytical model and good agreement has been found. The computed results are then compared with the measured heave and surge motions of the model icebergs which agree quite well, within the limits of experimental error. The computational and experimental models are not meant to address in detail all the hydrodynamic aspects of wave interaction with a free floating iceberg. Only the oscillatory motions of icebergs have been computed and measured. The results indicate that the surge and heave velocity of model icebergs, with a draft to water depth ratio of less than 0.1 can be greater than 0.8 times the water particle velocity when the iceberg horizontal dimension is less than 0.3 times the wavelength. Additional computational and experimental model studies showed that the surge motion is reduced to less than 0.1 times the particle velocity when the draft to depth ratio is about 0.9 and the horizontal dimensions of the iceberg are increased to 0.5 times the wavelength. The heave motion for the same situation is reduced to about 0.5 times the particle velocity.
Publication date
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedYes
NRC number6468
NPARC number8896186
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Record identifiera3f75d82-625f-49f8-b81f-2dddea7d6812
Record created2009-04-22
Record modified2016-05-09
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