Abstract
Accurate and significant wave height prediction with a couple of hours of warning time should offer major safety improvements for coastal and ocean engineering applications. However, significant wave height phenomenon is nonlinear and nonstationary, which makes any prediction simulation a non straightforward task. The aim of the research presented in this paper is to improve predicted significant wave height via a hybrid algorithm. Firstly, empirical mode decomposition (EMD) is used to preprocess the nonlinear data, which are decomposed into several simple signals. Then, least square support vector machine (LSSVM) with nonlinear learning ability is used to predict the significant wave height, and particle swarm optimization (PSO) is implemented to automatically perform the parameter selection in LSSVM modeling. The EMD-PSO-LSSVM model is used to predict the significant wave height for 1, 3 and 6 hours leading times of two stations in the offshore and deep-sea areas of the North Atlantic Ocean. The results show that the EMD-PSO-LSSVM model can remove the lag in the prediction timing of the single prediction models. Furthermore, the prediction accuracy of the EMD-LSSVM model that has not been optimized in the deep-sea area has been greatly improved, an improvement of the prediction accuracy of Coefficient of determination (R2) from 0.991, 0.982 and 0.959 to 0.993, 0.987 and 0.965, respectively, has been observed. The proposed new hybrid model shows good accuracy and provides an effective way to predict the significant wave height for the deep-sea area.
Highlights
Significant wave height prediction has many vital applications
The single model used here is least square support vector machine (LSSVM), ELM, and ANN, and the significant wave height is predicted for 1 hour and 3 hours
The three algorithms have achieved satisfactory results in predicting the significant wave height, but LSSVM has higher prediction accuracy than the other two models. This clearly shows that compared with other models, the proposed LSSVM model can be considered as the best wave height predictor
Summary
Significant wave height prediction has many vital applications. It can improve the efficiency and safety of operations in marine and offshore environments (Duan et al, 2016a). An accurate estimation of the significant wave height is relevant to characterize the wave energy production from Wave. Over the past few years, several numerical methods have been developed to predict significant wave height, using either classical statistical methods, the artificially intelligent techniques based on linear and nonlinear models, or hybrid models (Hwang, 2006;Casas-Prat et al, 2014;Janssen, 2008). Accurate prediction of significant wave height requires a large amount of sensor-based data while the computational complexity of the calculations is still relatively high and requires high-performance computers. Last but not least wave height predictions are still not always very accurate (Yoon et al, 2011;Browne et al, 2007)
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