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Keywords: directional wave spectra
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Proceedings Papers
Accuracy of Directional Spectrum Estimation in 2 nd Order Multidirectional Waves
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Paper presented at the The 33rd International Ocean and Polar Engineering Conference, June 19–23, 2023
Paper Number: ISOPE-I-23-346
... in such tests, different methods for estimation of the directional wave spectra may be applied. However, different assumptions are imposed in the methods and deviations here from provide uncertainties in the results. The following paper quantifies the influence of nonlinear effects on the accuracy...
Proceedings Papers
An Empirical Spectral Wave Model Based on Deep Learning
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Paper presented at the The 32nd International Ocean and Polar Engineering Conference, June 5–10, 2022
Paper Number: ISOPE-I-22-254
... ABSTRACT Directional wave spectra are of importance for many practical applications. Previous studies show that the wave spectral densities at a given point are correlated with the local or remote wind field. This feature can be used to predict the wave spectrum empirically. In this study...
Proceedings Papers
Variation of the Drag Coefficient Investigated Using Tower-Based Long Period Measurements - Condition With Following and Cross Swell -
Available to PurchaseNaoya Suzuki, Masao Yamamoto, Yoshiaki Toba, Satoru Komori, Naohisa Takagaki, Yasuyuki Baba, Teruhiro Kubo, Kohei Shintaku
Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-386
... spectral data in long period measurements. Wind and wave data observed at a coastal tower operated by Shirahama Oceanographic Observatory of Disaster Prevention Research Institute, Kyoto University, Japan, together with data sets observed by Suzuki et al. (2002) are used. The directional wave spectra were...
Proceedings Papers
Application of Bayesian Wave Estimation to Actual Merchant Vessels
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Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-474
... in the recent past (e.g. Iseki and Terada, 2002). One of the most important problems for the systems was to get information about directional wave spectra. Based on the assumption of linearity between waves and ship motions, some studies tried to estimate directional wave spectra using ship motion data (e.g...
Proceedings Papers
Motion-based Wave Estimation By a Bayesian Inference Method: a Procedure For Pre-defining the Hyperparameters
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Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-422
... in the estimations. KEY WORDS: Bayesian estimation, Directional wave spectra, hyperparameters, ABIC INTRODUCTION In recent years, many research groups have addressed the problem of directional wave spectrum estimation from the record of vessels 1st order responses ( (Nielsen and Iseki, 2010), (Iseki, 2011), (Simos...
Proceedings Papers
Successive Inverse Estimation of Directional Wave Spectra By Using Ship Motions Based On State-space Modeling Procedure
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Paper presented at the The Twenty-first International Offshore and Polar Engineering Conference, June 19–24, 2011
Paper Number: ISOPE-I-11-107
... ABSTRACT: In this study, a new technique to estimate directional wave spectra with respect to encounter waves of ships based on ship motions data is introduced. Firstly, the ship motion is analyzed by a Time Varying AutoRegressive modeling procedure, and cross spectra of the ship motion data...
Proceedings Papers
Further Modification Practical Method For Estimating Directional Wave Spectrum By HF Radar
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Paper presented at the The Nineteenth International Offshore and Polar Engineering Conference, July 21–26, 2009
Paper Number: ISOPE-I-09-058
... spectra and wind direction. The simultaneously observational technology for sea surface currents by HF radar sea-echo Doppler spectrum has already been established and applied into practical use. Nonetheless, the estimation of directional wave spectra remains unexplored, and limited to theoretical aspect...
Proceedings Papers
Validation And Assimilation of ENVISAT ASAR Directional Wave Spectra In Wave Model WAM
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Paper presented at the The Fourteenth International Offshore and Polar Engineering Conference, May 23–28, 2004
Paper Number: ISOPE-I-04-294
... of altimeter wave heights from ERS2 only. A statistical analysis of the wave heights obtained with different runs at crossover locations of JASON-1 and ENVISAT is presented and shows the best estimate when using the ASAR spectral information. INTRODUCTION The possibility of using directional wave spectra...
Proceedings Papers
Recursive Bayesian Modeling For Online Estimation of Directional Wave Spectra
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Paper presented at the The Thirteenth International Offshore and Polar Engineering Conference, May 25–30, 2003
Paper Number: ISOPE-I-03-233
... ABSTRACT An online procedure for estimating directional wave spectra for marine vessels is proposed. The procedure is developed as a subsystem of onboard marine guidance equipment. To simplify the system, the hull of a ship is regarded as a wave sensor and time history data of ship motions...
Proceedings Papers
Optimization of the Assimilation Scheme of Directional Wave Spectra In Wave Model WAM:Application to Real ASAR-ENVISAT Wave Spectra
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Paper presented at the The Thirteenth International Offshore and Polar Engineering Conference, May 25–30, 2003
Paper Number: ISOPE-I-03-215
... the impact of the assimilat ion is more significant for the low frequency part of the wave spectrum. The comparison with existing altimeter data from ERS2 has permitted on the one hand to validate the real ASAR directional wave spectra, and on the other hand to estimate the efficiency of the assimilation...
Proceedings Papers
Analysis of Various Wave Components On the Relationship Between Non-dimensional Roughness Length And Wave Age
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Paper presented at the The Twelfth International Offshore and Polar Engineering Conference, May 26–31, 2002
Paper Number: ISOPE-I-02-272
... spectra by EMEP method (Hashimoto, 1997). Based on directional wave spectra the data sets can be separated into Case 1 and Case 2, where Case 1 is only swell and wind waves, and Case 2 is existing a lot of component wave. It was shown that conditions of Case 2 existed by form of a bay and coast...
Proceedings Papers
Bayesian Estimation of Directional Wave Spectra For Ship Guidance System
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Paper presented at the The Eleventh International Offshore and Polar Engineering Conference, June 17–22, 2001
Paper Number: ISOPE-I-01-428
... ABSTRACT New techniques are introduced into the Bayesian modeling procedure to estimate directional wave spectra based on ship motion data. In the proposed method, the triple-valued function problem in following seas is strictly taken into account and the optimum solution is obtained from...
Proceedings Papers
Shallow-Water Nonlinear Wave Instabilities And Energy Transfer
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Paper presented at the The Seventh International Offshore and Polar Engineering Conference, May 25–30, 1997
Paper Number: ISOPE-I-97-282
... for the nonlinear energy exchanges among sets of waves of different frequency and directions. experiment evolution wave train type ii instability wave instability water depth gravity wave ii instability energy transfer shallow water mclean directional wave spectra unperturbed wave shallow-water...
Proceedings Papers
The Use of Classical Maximum Likelihood Method For Estimating Directional Wave Spectra From Heave-Pitch-Roll Time Series
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Paper presented at the The Third International Offshore and Polar Engineering Conference, June 6–11, 1993
Paper Number: ISOPE-I-93-216
... for Estimating Directional Wave Spectra from Heave-Pitch-Roll Time Series E.K. Skarsoulis and G.A. Athanassoulis National Technical University of Athens Athens, Greece Abstract The joint statistics of averaged sample auto- and cross-spectra from a heave-pitch-roll time series is studied. It is found...
