Developing families of Ochi-Hubble spectra for the northern parts of the Gulf of Oman

Abstract

The Ochi-Hubble spectrum model is a six-parameter spectrum proposed for sea states consisting of swell and wind-sea components. This paper modifies this model, and analyzes them using two series of measurement dataset in the Gulf of Oman during 2006–2007 and 2016, to represent its double-peaked spectra. Double-peaked spectra of the 2016 dataset were recorded at seven stations and then were categorized into two groups based on the dominance of swell or wind-sea components, each including five classes based on the significant wave height. In the meantime, values of six parameters of the Ochi-Hubble model were extracted from field dataset. Then, a comprehensive statistical analysis was performed based on the occurrence probability of spectra, resulting in a modified family of Ochi-Hubble spectra. Such spectra were compared to two spectra recently calibrated for the region. Moreover, the model was compared with the 2006–2007 dataset to assess its performance over time. Based on the aforementioned comprehensive evaluations and extensive field measurements, this modified model describes double-peaked spectra of the region better than previously suggested ones.