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Kim, M.H.; Woo, S.-B.; Lee, H.M.; Kim, K.-H.; Song, J.-I., and Kim, J.W., 2023. Impacts of marine construction on tidal and residual characteristics: An example from the Incheon Bridge. In: Lee, J.L.; Lee, H.; Min, B.I.; Chang, J.-I.; Cho, G.T.; Yoon, J.-S., and Lee, J. (eds.), Multidisciplinary Approaches to Coastal and Marine Management. Journal of Coastal Research, Special Issue No. 116, pp. 61-65. Charlotte (North Carolina), ISSN 0749-0208. This study examined the effects on tidal and residual characteristics resulting from the reduction in channel width due to the construction of the Incheon Bridge (IB). Using the three-dimensional numerical model two scenarios were simulated without and with the construction of the IB. Installed piers from the IB construction changed the characteristics of flood and ebb tides, especially near the bridge. As a result, the ebb-dominance on the north side of the navigation channel near the bridge is weakened, and the ebb-dominance on the south side is strengthened. Due to these changes in tidal asymmetry, the residual flow velocity of all vertical layers on the north side of the navigation channel is increased to the ebb direction, strengthening the vertical two-layer circulation. On the other hand, on the south side of the channel, the residual flow velocity of all vertical layers is increased in flood direction, unifying the residual direction of all vertical water columns to the ebb direction. Therefore, the influence of marine constructions such as bridges can play an important role in numerical model studies on tidal and residual characteristics of coastal regions. [ABSTRACT FROM AUTHOR]