Sea ice surveys are conducted along the Okhotsk Sea coast of Hokkaido, Japan using a bottommounted IPS and ADCP. This paper reports on the analysis of a 180km long “ice draft profile” or “underside profile” of deformed pack ice moving past the mooring site in 2001. The underside profile was not flat and had very large undulations, and the maximum draft during the observation period was 3.6m. Although the underside profile as a wave profile has non-stationary characteristics as results of Discrete Wavelet Analysis and application of Locally Stationary AR Model, the normalized power spectrums of the profile in locally stationary span were roughly the same and the mean wavelength was approximately 62m. In addition, simulation methods for deformed sea ice draft depth and plane unevenness of sea ice bottom using the power spectrum from one-point measurement data as in this measurement are also discussed.
