【作者】 田琦；

【导师】 白玉川；

【作者基本信息】 天津大学 ， 水力学及河流动力学， 2007， 硕士

【摘要】 海岸河口地区是海陆交互地区,水动力环境极其复杂,泥沙运动活跃。人类对沿海地区的改造活动(河口整治、近海采油等)及城乡发展引起水质污染日益严重,环境恶化加剧和航道淤积等问题,急需我们对泥沙输运、污染扩散和盐水入侵等问题进行研究,也表明研究该地区水动力作用规律的重要性。本文叙述了水流泥沙三维数学模型以及温盐二维数学模型的一般理论,水流方程以Navier-stokes方程为基础,经σ坐标变换导出模式方程,然后在该坐标系下将三维流场进行垂直分层,并在每一层内积分模式方程,在数值求解方面采用分步、差分近似和Galerkin集中质量有限元法相结合的方法进行求解。在实际应用方面,对越南电厂取排水口附近区域进行了三维模拟计算。潮流及含沙量验证采用工程区内3个实测点进行同步实测潮位、流向、流速及含沙量的验证。验证成果表明计算值和实测值吻合很好。综上所述,水流模型的建立是可靠的,其计算方法可应用于实际工程项目中。更多还原

【Abstract】 The coastal estuarial area is continental-oceanic interaction region which take on complex hydrodynamic environment and active sediment movement. And the human beings’ rebuilding activity(such as estuary regulation and offing production)and the development of city leads to a series of problems such as serious water pollution, environmental deterioration and sediment silting,which all need the urgent solution. So it’s significance to study hydrodynamism rule in this area including sediment transport,dispersal of pollution, salt water encroachment and so on.In this paper, the theory of current sediment three-dimensional mathematical model and temperature-salinity two-dimension mathematical model is introduced.And the current equation is based on navier-stokes equation.The model equation has been deduced throughσ-coordinate transformation, then in this coordinate the three-dimensional flow field is split into many layers along its depth and the model equation in each layer is integrated.As to the numerical solving method,the methods of frictional steps ,difference approximation and galerkin lumping coefficient matrix definite element method are utilized.In a practical application, three-dimensional calculation is applied to the tide current of Campha thermal power station in Vietnam.We demonstrate the actual tidal level, flow direction, velocity and sediment concentration in three measurement stations. It shows that the calculated value coincide with measured value well. Generally, it was reliable to establish the two-dimension flow mode and reflect practice clearly.更多还原