A Study On The Computational Modeling Of Tidal Current And Terrain Evolution In Embayment

The Embayment is located in the link between land and sea,and its development environment is superior.It has important economic and strategic value.It is important to know and understand the evolution law of the Embayment landform and the hydrodynamic factors in the embayment for the utilization and protection of the embayment.In this paper,numerical models,including hydrodynamic model,sediment transport model and topographic evolution model,are used to study the topographic equilibrium profiles of embayments with different lengths.Firstly,this paper introduces the computational model,the corresponding difference method and the computational process.In order to ensure the correctness of the calculation model,this paper validates the hydrodynamic module in the analysis of spatial characteristics of tidal waves in embayments of different lengths,and studies the characteristics of tidal waves under frictional and non-frictional conditions.In order to study the influence of initial topography on the equilibrium profile of the embayment,numerical models were used to simulate the bottom profiles of rectangular,convergent and divergent short embayments with different initial topography.The terrain evolution module is validated by comparing the bottom equilibrium profile with the short embayment theoretical equilibrium profile;the sediment transport model is validated by comparing the suspended sediment concentration in the bottom equilibrium profile with the theoretical concentration in the short embayment equilibrium profile;and the influence of the initial topographic slope on the bottom equilibrium profile of the embayment is analyzed by comparing the embayment equilibrium profiles with the initial topographic slope of different slopes.It is clear that the embayment bottom equilibrium profiles corresponding to the initial topography of different slopes are different,but the profile types(slope,concave and convex)remain unchanged.In order to study the shape of the bottom equilibrium profile in long embayment,the bottom equilibrium profiles of rectangular,convergent and divergent long embayments were simulated by numerical model.Compared with the shape of the short embayment bottom balance profile,the change of the shape of the long embayment bottom balance profile was analyzed.On this basis,the influence of different sediment transport modes on the balance profile of the embayment bottom is further discussed.