The large-scale influence of the Great Barrier Reef matrix on wave attenuation

A comprehensive analysis of the Great Barrier Reef (GBR) reveals that its matrix—comprising individual reefs and spaces between them—is highly effective at attenuating wave energy, regardless of water depth or reef porosity. The study, utilizing a 16-year record of satellite altimeter data, found that wave conditions in the lee of the GBR are primarily influenced by local wind speed rather than wave behavior seaward or within the matrix itself. This suggests that once waves penetrate the reef matrix and break at its seaward edge, their energy dissipation is consistent and largely independent of depth or porosity. The findings challenge the assumption that reduced porosity would enhance wave attenuation, as individual reefs cast a wave shadow much larger than their physical footprint, making even isolated reef matrices remarkably efficient at absorbing wave energy.

Gallop, S. L., Young, I. R., Ranasinghe, R., Durrant, T. H., & Haigh, I. D. (2014). The large-scale influence of the Great Barrier Reef matrix on wave attenuation. Coral Reefs, 33(4), 1167–1178. https://doi.org/10.1007/s00338-014-1205-7