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During the construction of a dike, the riprap will drift due to the tidal current, which will seriously affect the quality of riprap and cause a lot of waste of riprap material. Based on the construction of a dike in Lianyungang Port Area, the hydrodynamic characteristics of the construction area of the dike and the adjacent sea area are studied based on mathematical modeling and theoretical formulae, the influence mechanism of the dike on the hydrodynamics is explored, and the migration mechanism of riprap under the action of tidal current is analyzed. At the same time, the riprap drift test and synchronous hydrological observation were carried out on the project site, and the calculation method of riprap drift was calibrated and verified. The research results may provide suggestions for riprap construction of similar dikes. [ABSTRACT FROM AUTHOR]