Cambridge University Press, Journal of Fluid Mechanics, (768), p. 468-475, 2015
DOI: 10.1017/jfm.2015.112
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We derive an equation that relates the evolution in time of the maximum of the horizontal fluid velocity at the surface of an irrotational deep-water plunging or spilling breaker to the first component of the pressure gradient at the surface. The approach applies to overhanging wave profiles, up to breaking time.