ABSTRACT Stokes, C.; Russell, P., and Davidson, M., 2016. Subtidal and Intertidal Three-Dimensionality at a High Energy Macrotidal Beach. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research, Special Issue, No. 75, pp. 472–476. Coconut Creek (Florida), ISSN 0749-0208. Three-dimensional beach features such as crescentic sandbars and rip channels influence a beach's response to storm waves, as well as significantly affecting the safety and amenity provided by the surf-zone for beach water-users. A dataset of 5.5 years of quasi-weekly bar measurements, and quasi-monthly intertidal surveys from Perranporth beach (Cornwall, UK) were used to quantify seasonal to inter-annual changes in three-dimensionality. These changes were seen to be dictated by the cumulative effects of antecedent wave and tide conditions. Although tide range was seen to be important, particularly at the outer bar,...