A new method for calculating wave energy power in finite water depth

Li Hui; He Hongzhou; Yang Shaohui; Sheng Wanan

doi:10.3969/j.issn.0253-4193.2018.12.001

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Li Hui, He Hongzhou, Yang Shaohui, Sheng Wanan. A new method for calculating wave energy power in finite water depth[J]. Haiyang Xuebao, 2018, 40(12): 1-10. doi: 10.3969/j.issn.0253-4193.2018.12.001

Citation:

Li Hui, He Hongzhou, Yang Shaohui, Sheng Wanan. A new method for calculating wave energy power in finite water depth[J]. Haiyang Xuebao, 2018, 40(12): 1-10. doi: 10.3969/j.issn.0253-4193.2018.12.001

Li Hui, He Hongzhou, Yang Shaohui, Sheng Wanan. A new method for calculating wave energy power in finite water depth[J]. Haiyang Xuebao, 2018, 40(12): 1-10. doi: 10.3969/j.issn.0253-4193.2018.12.001

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A new method for calculating wave energy power in finite water depth

doi: 10.3969/j.issn.0253-4193.2018.12.001

1.
College of Mechanical and Energy Engineering, Jimei University, Xiamen 361021, China;Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, Xiamen 361021, China;Key Laboratory of Ocean Renewable Energy Equipment, Fujian Province University, Xiamen 361021, China;Cleaning Combustion and Energy Utilization Research Center of Fujian Province, Xiamen 361021, China
2.
Centre for Marine and Renewable Energy, Environmental Research Institute, University College Cork, Cork P43 C573, Ireland

Received Date: 2017-08-09
Rev Recd Date: 2018-09-18

Abstract

Abstract

The accurate calculation of ocean wave energy power is the basis for the development and utilization of wave energy. In practice, the wave energy converters are generally installed in finite water depths. For irregular waves, the amount of wave power can be calculated only when the detailed wave spectra are known. For a variety of reasons, most of the measured wave data in practice are given in the forms of scatter diagrams or of wave significant heights and statistical wave periods. As a result, the popular choice is to use the formulas for deep-water waves to calculate the wave power in finite depth, which will cause large errors. It will be shown in this study that for irregular wave of JONSWAP theoretical spectrum in the depth of 50 m, the calculation error is up to 14.6%. In order to improve the accuracy of wave power, a method called "first- and second-order approximations based on energy frequency" is proposed, with which the wave power for different depths can be calculated accurately in the cases where the wave spectra are unknown. The examples for two theoretical wave spectra show that the method can reduce the errors of wave power calculation in limited bandwidth to less than 2.8%.
- finite water depth,
- wave energy,
- wave power,
- wave spectrum

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References(13)

References

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