Annual Journal of Civil Engineering in the Ocean Vol.36 (Special Feature)
A STUDY OF SEA ICE FLOE DISTRIBUTION ON OKHOTSK SEA COAST OF HOKKAIDO
2020 Volume 76 Issue 2 Pages I_905-I_910
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2020 Volume 76 Issue 2 Pages I_905-I_910
Sea ice floe distribution and their fractal dimensions on Okhotsk Sea coast of Hokkaido were analyzed from images taken by UAV in the ranges of 300m by 300m near shoreline. The floe sizes in this study had the mean of 2.14m and the median of 1.19m, and were widely distributed up to 65m. The floe sizes up to 5m accounted for 90% of the total number, and its frequency distribution had strong skewness. Although an unified fractal dimension which can be applied to the whole range of the floe size was not found, fractal dimensions were able to be defined in three divisions. Simulation methods of the floe sizes using plural fractal dimensions and a theoretical probability distribution (log-normal) were also discussed. Fundamental knowledges useful for engineering issues such as an occurrence prediction of ice jam formation considering non-uniformity of ice floe size were obtained.
