| Analysis of Wave Directional Spreading by Bayesian Parameter Estimation |
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| 作者姓名： | Hwa CHIEN |
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| 作者单位： | Institute of Hydraulic and Ocean Engineering，Cheng Kung University，Coastal Ocean Montioring Center，Cheng Kung University，Institute of Hydraulic and Ocean Engineering，Cheng Kung University Tainan 80101，China，Tainan 70101，China，Tainan 80101，China |
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| 摘 要： | A spatial array of wave gauges installed on an observatoion platform has been designed and arranged to measure the lo-cal features of winter monsoon directional waves off Taishi coast of Taiwan. A new method, named the Bayesian Parameter Estimation Method(BPEM) , is developed and adopted to determine the main direction and the directional spreading parame-ter of directional spectra. The BPEM could be considered as a regression analysis to find the maximum joint probability of parameters, which best approximates the observed data from the Bayesian viewpoint. The result of the analysis of field wave data demonstrates the highly dependency of the characteristics of normalized directional spreading on the wave age. The Mit-suyasu type empirical formula of directional spectrum is therefore modified to be representative of monsoon wave field. More-over, it is suggested that Smax could be expressed as a function of wave steepness. The values of Smax decrease with increas-ing steepness. Finally, a local directi
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Analysis of Wave Directional Spreading by Bayesian Parameter Estimation |
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| Hwa CHIEN Laurence Z.H. CHUANG and Chia Chuen KAO
"institute of Hydraulic and Ocean Engineering,Cheng Kung University,Tainan ,China
Coastal Ocean Montioring Center,Cheng Kung University,Tainan ,China.Analysis of Wave Directional Spreading by Bayesian Parameter Estimation[J].China Ocean Engineering,2002,16(1):89-105. |
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| Authors: | Hwa CHIEN Laurence ZH CHUANG and Chia Chuen KAO
"institute of Hydraulic and Ocean Engineering Cheng Kung University Tainan China
Coastal Ocean Montioring Center Cheng Kung University Tainan China |
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| Institution: | Institute of Hydraulic and Ocean Engineering, Cheng Kung University, Tainan 80101 , China Coastal Ocean Montioring Center, Cheng Kuag University, Tainan 70101 , China Institute of Hydraulic and Ocean Engineering, Cheng Kung University, Tainan 80101 , China |
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| Abstract: | A spatial array of wave gauges installed on an observatoion platform has been designed and arranged to measure the lo-cal features of winter monsoon directional waves off Taishi coast of Taiwan. A new method, named the Bayesian Parameter Estimation Method(BPEM) , is developed and adopted to determine the main direction and the directional spreading parame-ter of directional spectra. The BPEM could be considered as a regression analysis to find the maximum joint probability of parameters, which best approximates the observed data from the Bayesian viewpoint. The result of the analysis of field wave data demonstrates the highly dependency of the characteristics of normalized directional spreading on the wave age. The Mit-suyasu type empirical formula of directional spectrum is therefore modified to be representative of monsoon wave field. More-over, it is suggested that Smax could be expressed as a function of wave steepness. The values of Smax decrease with increas-ing steepness. Finally, a local directional spreading model, which is simple to be utilized in engineering practice, is prop-osed. |
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| Keywords: | directional wave spectntm Bayesian theorem wave age |
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