A numerical experiment on tidal river simplification in simulation of tide dominated estuaries

15th Asian Congress of Fluid Mechanics

物理学;力学

Yin, X.^1 ; Jia, L.^2 ; Zhu, L.^1

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou

510640, China^1

Center for Coastal Ocean Science and Technology Research, School of Marine Sciences, Guangzhou

510275, China^2

关键词: Channel geometry;    Channel length;    Numerical experiments;    Numerical simulation of tides;    Simplification method;    Simulation error;    Tide-dominated estuaries;    Topographic data;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/822/1/012042/pdf
DOI  :  10.1088/1742-6596/822/1/012042

学科分类：力学，机械学

来源: IOP

【 摘 要 】

In numerical simulation of tide dominated estuaries, introduction of simplified tidal channels into the model for real rivers is one of the strategies to deal with the lack of topographic data. To understand the effects of simplification and their sensitivity to the simplifying parameters, a numerical experiment was conducted to test the parameters such as channel length L, surface width B, bed slope S, bottom elevation0, bed roughness n and run-off Qr. The results indicated the values of those parameters which were liable to less tidal prism and greater flood resistance would result in larger simulation errors. For a better simplification the values of parameters for the channel geometry, resistance and upstream inflow needed to be consistent with the average of the natural river as much as possible. The simplification method made the computation stable, fast and saved the storage space and it was adoptable for different time periods and seasons.