Min, B.; Park, K.; Youm, M., and Suh, K., 2014. Improvement of the wet and dry algorithm for an inundation problem using a parallel numerical model.Rip current flow is dependent on wave-induced set up and thus on wave conditions and wave dissipation. Waves will break over the bar if the ratio of wave height to water depth exceeds a certain value. This implies that rip currents are not only dependent on wave height but also on water level that might be modified by the tide. Many studies noticed rip-current in tidal environments is that tide acts mainly as a change in water level. In coastal regions, the flooding and ebbing of the tide and waves play important roles in the local ecosystem and coastal physical processes. The complex physical process of a flood and ebbing wave presents a nontrivial modeling challenge. For a closed water body, where evaporation, precipitation and ground absorption are not considered, the total water mass should be conserved during inundation or draining. In this study, the ADCIRC (Advanced CIRCulation Model) was configured for a 120 by 120 km, square-shaped model domain. A bowl-shaped water system, with a surface diameter of 60 km and a maximum depth of 9 m, was embedded in the center of the model domain. A mass conserving wetting and drying scheme, which is very simple and practical. The water mass removed from any wet cell is uniformly redistributed into the system to maintain the water mass balance. Since there is a uniform change in the system, the hydrodynamic balance between the pressure gradient and the flow fields in the system is maintained. The redistribution of the water mass and readjustment of the sea surface elevation in the system are performed by the model in subsequent steps. The advanced wetting and drying scheme shows a good performance. This study was conducted as part of the wave-tide-surge coupling model (ADCIRC-SWAN) development which system can be used for predict the rip-current system combined with tidal environment.