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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Transformation of Mean and Highest One-Tenth Wave Heights Using Representative Wave Approach) ผู้เขียน: Poonchai Nuntakamol, Winyu Rattanapitikon สื่อสิ่งพิมพ์:pdf AbstractModels were studied for computing the mean wave height (Hm) and highest one-tenth wave height (H1/10) using a representative wave approach. Many researchers have pointed out that the use of a representative wave approach can give erroneous results in the computation of representative wave height transformations. However, the representative wave approach has great merit in its simple calculations. It would be useful for practical works, if this approach could be used to compute representative wave heights. Some researchers showed that the representative wave approach can be used to compute the transformation of the root-mean-square wave height and significant wave height with very good accuracy. However, it is not clear whether the approach is applicable for computing Hm and H1/10. The present study investigated the accuracy of the calculation of the transformation of Hm and H1/10 by using the representative wave approach. Laboratory data from small-scale and large-scale wave flumes were used to examine the models. The representative wave height transformation was computed from the energy flux conservation law. Seven energy dissipation models of regular wave breaking were directly applied to the irregular wave model to test their applicability. It was found that by using an appropriate energy dissipation model with new coefficients, the representative wave approach can also be used to compute Hm and H1/10 with very good accuracy. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Verification and Modification of Conversion Formulas for Estimating Statistical-Based Representative Wave Heights from Zeroth Moment of Wave Spectrum Based on Field Data) ผู้เขียน:Winyu Rattanapitikon สื่อสิ่งพิมพ์:pdf AbstractConversion formulas were studied for estimating statistical-based representative wave heights (the mean wave height (Hm), root-mean-square wave height (Hrms ), average of the highest one-third wave height (H1/3) and average of the highest one-tenth wave height (H1/10)) from the zeroth moment of the wave spectrum (m0). The applicability of five sets of existing conversion formulas was examined based on two field experiments of the COAST3D project (using 13,430 wave records). The examination showed that the conversion formulas derived from the Weibull distribution with a constant shape parameter gave the best prediction. The best set of conversion formulas was modified by reformulating the shape parameter in the formulas. The modified formulas gave slightly better predictions at Hm , Hrms and H1/3 , and considerably better prediction at H1/10 than those of existing formulas. The modified formulas can be applied from shallow water to deepwater. |
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