A Numerical Prediction with “DMDF” Model of Pack Ice Motion in the Okhotsk Sea

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  • DMDFモデルによるオホーツク海流氷運動の数値予測
  • DMDF モデル ニヨル オホーツクカイ リュウヒョウ ウンドウ ノ スウチ

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The Distributed Mass/Discrete Floe model, DMDF model, is a new numerical model for pack ice motion computation. This model expresses the ice floe collision by dividing the pack ice into many ice floe bunches in which ice floes are distributed uniformly : thus it can express the discrete nature of force transmission between the floes and also can treat a larger number of floes than a discrete element approach. This paper applies the DMDF model to the computation of one-week pack ice motion in the Okhotsk Sea of February 1994, transferring a large amount of data from the Japan Meteorological Agency, and then discusses the characteristics of the model and ice motion in this particular sea area.<BR>The main conclusions are :<BR>(1) The DMDF model showed rigorous ice motion against the external forces such as wind and current.<BR>(2) The ice motion is determined mainly by the wind, but the local behavior is strongly affected by the current.<BR>(3) The interaction between the wind, ice and current is important, thus the coupled computation with the current is required to predict the ice motion more precisely.<BR>(4) Since the direction of shearing force due to wind is different from the wind direction by the influence of Coriolis force due to the earth rotation, the computed ice motion agrees better with the observation when the shearing force direction is deviated in clockwise direction.<BR>(5) The computed ice motion is compared with the buoy observation. The result showed fairly good agreement. It is recognized, however, that more accurate and detailed current data is necessary.

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