从水沙通量变化对大河三角洲河口海岸建造及地貌演化的影响机理角度 ,通过研究目前国际上普遍采用的统计模型、几何模型、沉积动力学模型 ,以及数值模拟模型四种方法在建立大河三角洲河口海岸演化机理模型研究中的各自特点和不足 ,提出了建立宏观尺度机理模型的初步设想 ,并对运用Lagrange余流建立海岸演化机理模型所涉及的余流场的尺度转换、总余流场的建立和表达、用长期余流场构建泥沙起动、输运和沉积条件模式以及一线模型与三维动力模式耦合等关键性问题 ,提出了初步解决方案 From the point of view of the influence mechanism of flux of water and sediment on the construction and geomorphic evolution of estuaries and estuaries in the delta river, four methods, statistical model, geometric model, sediment kinetic model and numerical simulation model commonly used in the world, Estuary coastal evolution mechanism model of the respective characteristics and shortcomings, put forward the establishment of macro-scale mechanism model of the initial idea, and the use of Lagrangian residual flow model for the establishment of the coast of the remaining flow field scale conversion, the total residual flow field Established and expressed the key problems such as sediment start-up, transportation and sedimentary conditions model coupled with the long-term residual flow field and the coupling between the first-line model and the three-dimensional dynamic model and put forward the preliminary solution