NUMERICAL ANALYSIS OF SNOWDRIFTS OBSERVED AT MIZUHO STATION IN ANTARCTICA AND IN LOW TEMPERATURE WIND TUNNEL AND SNOW ENTRAINMENT COEFFICIENTS

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  • みずほ基地における現地観測と低温風洞実験に基づく地吹雪データの数値解析および雪の連行係数の評価
  • ミズホキチ ニ オケル ゲンチ カンソク ト テイオン フウドウ ジッケン ニ モトヅク ジフブキ データ ノ スウチ カイセキ オヨビ ユキ ノ レンコウ ケイスウ ノ ヒョウカ

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Abstract

Applicability of numerical model using κ-ε turbulence model to snowdrifts are examined. Results of experiments in the low temperature wind tunnel at Shinjo and field observations at the Mizuho station in Antarctica are compared with the results of the numerical analysis. The partial differential equations are discretized based on the SIMPLE method. Transport of solid particles is often modeled by the turbulent diffusion equations. In order to integrate such differential equation, the boundary condition at the bed are important for the precise calculation. The idea of snow entrainment coefficient is useful to descibe the bed condition. The functional form of such coefficient, however, is not established until now. The values of the snow entrainment coefficient are presumed comparing with the profiles of snow particle flux observed to the numerical calculations. The functional form of the snow entrainment coefficient is discussed comparing with the empirical function proposed by Garcia in sand case.

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