The purpose of the present work is to investigate the process of sharpening and formation of singular flows in symmetric and non-symmetric subharmonic gravity waves that have a period m times greater than the period of Stokes waves. Subharmonic waves are excited due to subharmonic instabilities of Stokes waves and have the crests of different height, as was at first established by Chen and Saffman for symmetric waves and by Zufiria for non-symmetric waves.
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