Author(s): Shinji Kioka; Yasuji Yamamoto; Daisuke Honma; Mitsuhiro Sakikawa; Shigeki Sakai
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Abstract: Sea ice surveys were conducted along the Okhotsk Sea coast of Hokkaido, Japan using a bottom-mounted IPS and ADCP. We quantitatively analyzed the draft and the bottom unevenness of sea ice. The purpose was to mainly acquire inputs or boundary conditions needed to forecast the range of oil spreading under sea ice. The collected observation data (distance vs. draft) were analyzed by discrete wavelet transform and by locally stationary AR model. We suggested that the complicated sea ice draft profile or bottom unevenness that is non-Gaussian and has non-stationary characteristics could be represented using only typical normalized spectrum and variance of sea ice draft that indirectly reflects non-stationary characteristics of sea ice draft. We also found significant amplitude of bottom unevenness elevation were roughly proportional to standard deviation of sea ice draft (its ratio: 3.6), which means we could describe the bottom unevenness elevation of sea ice intuitively and visually using the standard deviation.
Year: 2004