Input reduction for long-term morphodynamic simulations in wave-dominated coastal settings

► A generic input-reduction framework for wave-dominated coasts is introduced. ► The reduced input is referenced to a simulation with the full wave-forcing series. ► Low wave energy must be retained to obtain realistic long-term sandbar behavior. ► Input reduction can dramatically affect long-term predictions. ► It is imperative to consider input reduction as intrinsic part of the model set-up.