【作者】 李姗；

【导师】 白玉川；

【作者基本信息】 天津大学 ， 港口、海岸及近海工程， 2008， 硕士

【摘要】 本文结合当前港口建设中所关注的粉沙淤泥质海岸建港问题进行了主要研究。在文章中结合粉沙质沙的特性对粉沙淤泥质海岸进行定义,同时分析了该海岸类型下的泥沙运动特点,在总结前人研究理论的基础上提出了自己的研究方法。泥沙运动特点是港口海岸建设工程中必然要考虑的问题,本文由粉沙淤泥质海岸泥沙运动特点建立起水流泥沙方程,根据粉沙质泥沙特性分别建立悬移质、推移质输沙方程,以及床面变形方程,对于泥沙冲淤模型采用平衡挟沙的原理进行计算,希望能提出一个合理有效的计算模型。与此同时,采用二维迎风有限元方法解决二维水流泥沙问题,用三角形网格对计算区域进行剖分,同时为了节省计算机内存,采用集中质量法进行计算。在建立模型过程中,对于模型方程中有关物理量的确定,在以往研究的基础上又进行了进一步的改进,对前人的工作进行了发展与延伸,同时对海床稳定性条件进行了研究,给出了床面处于不冲不淤的稳定平衡状态的条件,对海床的稳定性判别给出了一个较为具体的判定条件。最后,为了对所建数学模型进行验证,针对所提出的二维水流泥沙数学模型方程,编制计算程序,并将程序运用于福清湾元载码头三期扩建潮流泥沙计算,结合计算结果对工程的布置及规模确定给予适当的建议,并且希望在此研究基础上该模型能够对粉沙淤泥质海岸泥沙运动特性研究有所帮助,特别是针对于潮流动力作用很强的粉沙淤泥质海岸河口。更多还原

【Abstract】 This paper is based on the problem that how to construct port structure on silty mud coast which is a very difficult and hot problem at present. A definition to silty mud coast and a new method on research are given, at the same time the characteristics of sediment transport based on the theories that are wildly accepted is analysised.It is necessary to consider the feature of sediment transport in the port engineering construction, and in this paper a set of the flow-sediment equations which is based the properties of sediment transport on the silty mud coast are established. By the same way, the suspended load and traction load equations and bed surface deformation equation are established.Balance sediment-carrying principle is used in order to give a reasonable calculation model. Meanwhile, two-dimension upwind finite element is used to solve the flow-sediment calculation, and the grid is triangular grid. Lumped mass method is used to saves computer memory.During the course of modeling building, a further improvement on the physical quantities that are furthermore development and extension based on the previous works is given in this paper. The stability condition of sea bed is studied and a equilibrium condition which provides the judgement of seabed stability is offered.Finally, in order to test the model, program based on the flow-sediment equations is written and applied.In this paper proper suggestions is given on the construction of ports.It is hoped that the conclusion will be useful in the future research of silty mud coast especially in the research on the coast and estuary where the influence of tide is stronger than wave.更多还原