海门电厂附近海域潮流泥沙运动的数值研究-环境科学专业论文.docxVIP

摘要Numerical 摘要 Numerical Study on Tidal Current and Sediment Transportation near the Haimen Power Plant Major：Environmental Science Name：Long Yingxian Supervisor：．Prof．Huang Ping Abstract Waves and tidal currents，whose interaction can arouse sediment problems，are the main hydrodynamic factors in estuary．Sediment siltation is usually the result of the estuarine and coastal engineering．Therefore，it is necessary tO study the tidal currents and sedimentation problems before building harbor． This paper discusses the tidal current sediment numerical simulation and its calculations．In consideration of the breakwater project of the Haimen Power Plant，a two—dimensional numerical model for unsteady flow and sediment transport is developed．The governing equations are the two—dimensional shallow water equation， the suspended sediment transport equation and transport capacity formula under the action of tidal currents and wind waves．The unstructured triangular meshes are used here．The paper discretizes the governing equations through the finite volume method within the high-performance Osher scheme．The model estimates the normal fluxes of every control volume and has been verified by observations．The model has been appHed to the layout of the power plant project．The change of tidal current field，and the influence of sand silt before and after engineering are also analyzed． The simulation results prove that，the velocity of water flow shows a significant reduction after the breakwater engineering，and the siltation amount of the port is on the small side．So the power plant project is reasonable． Keywords：Numerical Simulation，Tidal Current，Sediment，Finite Volume Method， Osher Scheme Ⅱ ：●I-●l●；l●：●j●● 中山大学硕士学位论文第1章前言 中山大学硕士学位论文 第1章前言 1．I 研究目的与意义 海岸、河口是陆海相互作用的集中地带，自然资源丰富，是经济发达、人口 集居之地。我国海岸线长达一万二千多公里，江河很多，北起鸭绿江、辽河、海 河黄河，中部的长江、钱塘江、闽江，南至南部的韩江，珠江等有大中型入海河 流数十条¨1。各河口海岸地区创造了巨大的经济效益，是我国主要的经济活动地 带。 然而，多数河口在天然条件下，都存在着不同程度的泥沙淤积问题，尤其是 人类资源的开发活动，对河口治理提出一系列的新课题，诸如港口建设、航道丌 挖、防波堤的修建、河口海涂的围垦、河D--角洲的整