Numerical Simulation Of Tidal Currents In Intertidal Zone

The intertidal zone is the sea area between the high and low tidal level lines.As a link between the land and the sea,it is affected by the natural environment and human activities.Tidal current is a kind of oceanic phenomenon that exists in the intertidal zone.It is also a form of ocean movement that affects human production activities.Coast is a sea area where human activities are very frequent,and it is often the area with the greatest potential for resource development.Therefore,understanding the laws of tidal currents in intertidal zones and studying the changes of tidal currents and tidal currents are important for the sustainable development of human society.In this paper,the tidal flow and the formation of the intertidal zone are simulated based on the project of the intertidal zone in the Liaohe Estuary,and the understanding and understanding of the intertidal zone is deepened through simulation.This paper builds a three-dimensional free surface intertidal zone model based on HydroInfo software.Unstructured finite volume method based on VC method for discrete shallow water equations,approximate Riemannian solution based on HLL for solving numerical flux,and semi-implicit scheme for source term guaranteeing stability,given initial conditions and boundary conditions for establishing model,using two On the applicability and accuracy of verification models for various types of dam break problems,and use models to model the intertidal tidal currents.The three types of tidal forecasting models included in the HydroInfo software were originally designed to calculate relatively accurate tidal level variations in the absence of boundary conditions in numerical simulations,thus providing data for research.When choosing the tidal forecasting model,a tidal forecasting model should be selected according to the geographical location of the required conditions.The harmonic analysis model fully considers the change of the tide level in the shallow water area.This model is used when mastering the accurate harmonic constant data..The offshore China model has higher accuracy for the survey sites located in the deepwater area.The oceanic model predicts the location of tidal levels to be closer to the land and the accuracy is lower for the interior of the ocean.In this paper,the Bohai Sea area is used as the computational domain and the boundary is taken in Dalian and Yantai.The Chinese coastal tidal forecasting model is adopted.The tide level process is propagated from the boundary location to the Liaohekou area,and the Dalian,Hong Kong,Bayuquan and Yingkou can be observed during the propagation process.Comparing the simulated and tidal values of 8 ports in Hong Kong,Chrysanthemum Island,Caofeidian,Tianjin Port,Laizhou Port,Yantai Port,etc.The measured tidal level process is extracted from the tidal table published by China Maritime Services Network.When the model flow field analysis can be performed,Observe the simulation results at each time and the water level,water depth,and flow velocity of each grid node.The numerical solutions of the tidal level and tidal range simulation results of the ports are basically consistent with the tidal table data.The numerical solution calculated by the HydroInfo software can simulate the tidal level variation process well.Through the Tecplot software,the intertidal range of the Liaohekou region was obtained.Through the simulation study,the research and understanding of the intertidal zone were further deepened.Through the study of the project,a comprehensive understanding of the tidal flow in the intertidal zone is provided,which provides a basis for the numerical simulation of tidal currents in the future.The study of the intertidal zone also contributed to the research on the ecological environment of the intertidal zone in the later period.