In response to the complex and variable water flow patterns in the estuary section,which are not conducive to organizing river dredging construction,taking the New Western Land-sea Corridor Channel(Pinglu Canal)as an example,the HEC-RAS one-dimensional unsteady flow mechanics calculation module is applied to construct a hydrodynamic model for the canal estuary section,and the roughness of the model is calibrated and the accuracy of the model is verified.On this basis,based on the water level and flow characteristics of the Youth Sluice(under the sluice),four flow(water level)conditions are set under the sluice to simulate and analyze the changes in river flow velocity.The results show that the HEC-RAS model has high simulation accuracy and good applicability in tidal river sections;With the increase of cross-sectional flow,the flow velocity response of the section from S26 to S32 near Shijiangdun is rapid,and the flow velocity is about 34.0％higher than other sections.The research results can provide technical support for the construction of dredging projects in the estuary of the canal.
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