Reinterpreting the Bruun Rule in the Context of Equilibrium Shoreline Models

Long-term (>decades) coastal recession due to sea-level rise (SLR) has been estimated using the Bruun Rule for nearly six decades. Equilibrium-based shoreline models have shown skillfully predict short-term wave-driven change on time scales of hours Both and equilibrium rely beach theory, which states that profile shape equilibrates with its local wave conditions. Integrating these two into a unified framework can improve our understanding predictive skill future behavior. However, given both account action, but over different scales, critical re-examination SLR-driven process is needed. We present novel physical interpretation response rise, identifying main contributing processes: passive flooding increased erosion efficiency. Using this new concept, we analyze integration and, an idealized test case, show mechanisms underpinning are explicitly described within integrated model. Finally, discuss possible advantages integrating equilibrium-based dynamic feedbacks broader implications coupling hybrid models.