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A numerical modeling system for simulating nearshore surf zone conditions and tidal processes is presented and evaluated with in situ data. The modeling system is comprised of the Regional Ocean Modeling System (ROMS v 3.0), a three-dimensional numerical ocean model, coupled with Simulating Waves Nearshore (SWAN), a spectral wave propagation model. The system has been modified with a new vertical distribution of radiation stress terms for applications in very shallow waters. The model performance is evaluated by comparing simulations to hydrodynamic data (wave height, direction, longshore and cross-shore currents) collected in the surf zone in northern South Carolina, U.S. Model results have been analyzed to discern the variability in three-dimensional and depth-averaged cross-shore and longshore velocities due to changing wave height, wave direction and tidal stage. Overall, the model shows good correlation to observed data and it is found to be capable of reproducing typical flow patterns observed due to depth-induced wave breaking. An implication for sediment transport applications on beaches with tidal variability is also discussed.