This work was funded by the Natural Environment Research Council (NERC) as part of the Integrating COAstal Sediment SysTems (iCOASST) project (NE/J005541/1), with the Environment Agency as an embedded project stakeholder. The authors gratefully acknowledge helpful discussions with other iCOASST project team members and with the invited attendees of the iCOASST International Conference on Simulating Decadal CoastalMorphodynamics, held from15 to 17 October 2013 in Southampton, UK.