This Thesis is dedicated to study the hydrodynamic processes associated to the harbour resonance phenomena. The study was focused to the characterization of the transient, non-linear, and coupled effects associated to the forcing mechanisms and to the response of the oscillations outside and inside the harbour facilities. The aim of this thesis was divided into tree main branches: 1) increase the harbour resonance phenomena knowledge; 2) improve the capacity to reproduce the phenomena through the implementation of an advanced finite-element numerical model, based on the modified Boussinesq equations Nwogu (1993), Liu & Woo (2004); and 3) Integrate the different techniques and tools into a methodology, able to improve the approximation of any future harbour resonance study. For these, first a spectral analysis has been developed to characterize the infragravity waves at the entrance of short wave field data, second an extensive laboratory campaign was proposed for different degrees of non-linearity and coupled resonance oscillations, and third the numerical model was validated with the laboratory data, as well as data measured in two real harbours, for both atmospheric long wave and bound long wave acting as forcing mechanism, obtaining excellent correlations.