VARIABILITY OF THE TOBA CONSTANT IN THE 3/2-POWER LAW BETWEEN SIGINIFICANT WAVE HEIGHT AND WAVE PERIOD

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  • 波高・周期間の3/2乗則におけるToba定数の変動性の考察
  • ナミ ダカ ・ シュウキ カン ノ 3/2ジョウソク ニ オケル Toba テイスウ ノ ヘンドウセイ ノ コウサツ

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Abstract

 This paper discusses variability of the Toba constant BT(=0.062) or the variable Toba coefficient B in the 3/2 power law between significant wave height Hs and period Ts. Main conclusions are summarized below. (1)The Takagaki et al.(2012) equation has a reasonable accuracy for estimating roughness length z0 and may yield a proper evaluation of friction velocity u* and B. (2)The Takagaki et al.(2012) equation with Iwano et al.(2013) indicates a weak dependence of B on u* even in usual wind conditions and also the observation-based Kahma·Calkoen(1992) equation suggests an implicit dependence of B on both u* and Hs. (3)Estimates of observation-based B at 17 points in many inner sea areas are site-dependent, in cases where the mean value ranges from 0.0463 to 0.0679. (4)A significant variation of the observation-based B with both u* and Hs suggests that the Toba 3/2-power law may not hold in a strict sense. (5)In addition, estimates of observation-based B are drag coefficient(Cd) formula-dependent, in cases where the mean value ranges from 0.0586 to 0.0625 for each of 6 Cd formulae.

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