This work presents a first analysis of experimental data studying the influence of the frequency bandwidth on the
 propagation of bichromatic wave groups over a constant 1:100 beach slope. The use of a large spatial cross-shore resolution
 and Bi-Spectral analysis techniques allows the identification of nonlinear energy transfers along the propagation
 of wave groups. During wave-group shoaling, nonlinear coupling between the primary wave frequencies results in a
 larger growth of superharmonics for narrow-banded wave conditions, increasing the skewness of the wave and leading
 to eventual instabilities and earlier high frequency (hf) wave breaking compared to the broad-banded wave condition.
 Regarding the growth of low frequency (lf) component, the data analysis has shown a larger growth of the incident
 bound long wave (IBLW) for broad-banded wave conditions. It is generally assumed that the transferred energy from
 the primary wave components to subharmonics does not affect the short wave energy budget. Here, the opposite is
 hypothesised, and a larger growth of the IBLW for broad-banded wave conditions is accompanied of a larger reduction
 of the primary wave components, a reduced growth of hf components and, consequently, a reduction in the growth
 of hf wave asymmetry during wave group shoaling. Conversely for narrow-banded wave conditions, a reduced IBLW
 growth is associated with a larger growth of hf wave asymmetry. After hf wave breaking, within the low frequency
 domain (lf), the IBLW decays slightly for narrow-banded conditions, consistent with a reduction in radiation stress
 forcing. This involves a nonlinear energy transfer from the wave group frequency back to hf components. The remaining
 lf energy, Outgoing Free Long Wave (OFLW), reflects back at the shoreline. However, for broad-banded wave
 conditions, strong dissipation and minimal reflection of lf components occurs close to the shoreline, which might be
 caused by lf wave breaking.