FVCOM模型关键参数的处理及其在涌潮模拟中的应用

Processingon key parameter in FVCOM and its application on tidal bore simulation

通过改进海床阻力系数和设置合适的垂向紊动背景系数,应用FVCOM模型成功再现了钱塘江河口强涌潮的演进过程。海床阻力系数采用Manning公式形式,取值随水深、地形在0.000 2~0.002 9之间变化;垂向紊动背景系数取1×10^(-4) m^2/s。模拟结果较好地复演了涌潮到达时刻、涌潮高度及涌潮抬升过程、涌潮水平流速以及其沿垂向分布规律,表明阻力系数及垂向紊动背景系数等关键参数的改进和处理是合理的,可应用于涌潮三维潮流运动特征模拟。

The evolution of tidal bore in Qiantang Estuary were successfully reproduced by applying FVCOM model through improving the sea bed roughness coefficient and setting suitable background vertical eddy viscosity.Sea bed roughness coefficient,calculated using the Manning formulation,is between 0.000 2~0.002 9 with the varying depth.The background vertical eddy viscosity is 1×10^-4 m^2/s.The simulation well reproduces the tidal bore arriving time,tidal level,setup height,horizontal velocity magnitude and vertical profile,which implies the choice of parameters such as the bed roughness coefficient and background vertical eddy viscosity are reasonable.The procedure could be extended to simulate the 3D tidal movement for tidal bores.