A Modified JONSWAP Spectrum Dependent Only on Wave Height and Period

Wah T. Lee · Susan L. Bales

Jan. 1980 · David W. Taylor Naval Ship Research and Development Center

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"For simplicity as well as consistency with the current state-of-the-art in seakeeping performance assessment, a wave spectral formulation for fetch-limited ocean areas which is dependent only on the significant wave height and modal wave period is desirable. A modified version of the JONSWAP spectrum is therefore derived, but as is the case with the usual fetch-dependent JONSWAP spectrum, it contains too much energy for fetches above about 40 nautical miles. This inconsistency is probably due to certain parameter relationships which are all based on least squares fits. Therefore, a new parameter, Beta is developed to replace the usual Alpha parameter, correcting for the parameter's nonuniversality."--Abstract.