Ponencia presentada en el XIX Congreso Internacional de Acústica (ICA2007), Madrid, 2-7 Sep 2007.-- PACS: 43.25.Yw.In the framework of applications of power ultrasound in liquid, this paper deals with the analysis of nonlinear ultrasonic waves through a bubbly liquid. An open-field domain is assumed to contain a water and air-bubbles mixture. The presence of bubbles induces a strong nonlinear behaviour of the wave. A set of coupled differential equations is considered to model this phenomenon, and solved numerically. The effect of the bubble distribution on the nonlinearity of the acoustic field is analysed.This work has been suported by the research projects CM-URJC-CEF-091-4-M263, DPI2005-00894, and HA2005-0151.Peer reviewed