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Estimating downwind turbulence intensity using wind and wave measurements during hurricanes

机译:估计飓风期间风波测量的下风湍流强度

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Analyses of simultaneous measurements of wind speed at 10 m, U-10, significant wave height, H-s and peak wave period, from 3 National Data Buoy Center (NDBC) buoys during the passage of 6 hurricanes over the wind seas when U-10 >= 9 m s(-1) indicate that overwater downwind turbulence intensity (TI) can be formulized as TI = -6.06 x 10(-5)U(10)(2) + 4.93 x 10(-3)U(10) + 3.95 x 10(-2), here U-10 is the wind speed at 10 m height over sea surface. It is found that TI = 0.08 when U-10 = 9 m s(-1), and it peaks up to approximately 0.14 when U-10 approximate to 40 in s(-1). Thereafter, TI saturates as U-10 continuously increases. From this TI formulation, overwater friction velocity (U-*) is inferred as U-* = 0.40U(10)(-6.06 x 10(-5)U(10)(2) + 4.93 x 10(-3)U(10) + 3.95 x 10(-2)). This friction velocity para-meterization is further verified by 3 independent methods: the direct eddy covariance, the wind gust and the wind-current interaction. It shows that this proposed U-* formula is valid up to U-10 = 56 m s(-1) during Super Typhoon Megi (2010) as validated by measurements based on the wind-current interaction method.
机译:在U-10在风海上的6个飓风通过6飓风期间,来自3个国家数据浮标中心(NDBC)浮标的10米,U-10,显着波高,HS和峰值波浪时段的同时测量。 = 9ms(-1)表示越来越疏水湍流强度(Ti)可作为Ti = -6.06×10(-5)U(10)(2)+ 4.93×10(2)u(10)+ 3.95 x 10(-2),这里U-10是海面高10米的风速。发现当U-10 = 9M S(-1)时,Ti = 0.08,并且当U-10近似到40英寸(-1)时,它高达约0.14。此后,当U-10连续增加时,Ti饱和。从该Ti配方中,越来越多的摩擦速度(U- *)被推断为U- * = 0.40u(10)( - 6.06×10( - 5)U(10)(2)+ 4.93×10(-3)U. (10)+ 3.95 x 10(-2)))。通过3个独立方法进一步验证这种摩擦速度计量比率:直接涡旋协方差,风阵风和风电相互作用。它表明,在超大台风Megi(2010)期间,这提出的U- *公式在超大台风Megi(2010)期间是u-10 = 56 m s(-1),这是通过基于风电流交互方法的测量验证的。

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