The integration of shoreline projection estimations in coastal management and urban planning documents has emphasized the need for simple, efficient shoreline and beach profile change models capable of estimating changes on interannual to decadal timescales. To make long-term projections of beach changes, it is necessary to estimate the impacts of climate change, including changes in both the wave climate and local mean sea level. While it is known to have many limitations, the most commonly used model for estimating sea-level rise impacts on beach profiles is the Bruun Rule. This work proposes a new approach for integrating water level changes in an equilibrium-based model of shoreline and beach changes. The proposed approach, which can be implemented in other similar models, integrates wave and water level drivers occurring at different timescales to explore their interaction in equilibrium-based models. Preliminary results are presented on a macrotidal beach and compared to previous equilibrium model simulations. Finally, the physical interpretation of the proposed formulation and future adaptations to this work are discussed.