ADVANCES IN POLAR SCIENCE ›› 2006, Vol. 18 ›› Issue (2): 108-115.

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OPTIMIZATION AND IDENTIFICATION ON CURRENT DRAG COEFFICIENT OF ISOLATED ICE FLOE

  

  • Online:2006-06-30 Published:2006-06-30

Abstract:

Current drag coefficient is one of the most important parameters in sea ice dynamics mod- el.In actual motion,both shear stress on the under surface and pressure on profile are exerted on ice,corresponding to skin drag coefficient and form drag coefficient,respectively.By using a wave-current tank in laboratory,drag movement experiments were performed for freshwater ice samples with different shapes,including cuboid with smooth underside,cuboid with rough underside and disk with smooth underside,and 26 data sets were obtained.Based on these da- ta,an optimization model to distinguish skin drag coefficient and form drag coefficient was es- tablished.Then the effect of ice under surface roughness on these two drag coefficients was ana- lyzed,the result revealed the relationship between skin drag coefficient and horizontal/vertical size of ice samples,which can make the skin drag coefficients of floe and iceberg in a same curve.