一、二维连接的河口冲淤数模

Mathematical Model of Linking 1-D and 2-D of Erosion and Sedimentation for an Estuary

在河口，河流动力和海洋动力相互作用，动力因素极为复杂．对于多沙河口，其冲淤演变规律更为复杂．河口的范围包括河口段河道、入海口及口外邻近海域．本文建立的适用于河口三部分水域的一、二维连接的冲淤数学模型，基本上能反映多沙河口冲淤演变频繁的现象，通过数模计算探讨了黄河口入海水沙与潮流、风吹流及波浪相互作用下的输沙规律，并实际计算了黄河口的冲淤地形及规划方案中各条流路河口的淤积范围等．

The force functions of a river and a sea are interacted in an estuary. The force functions are complicated. The range of a river mouth includes the river channel, the inlet to sea and the sea off the inlet. The mode1 for an estuary is estab1ished. The computed field in the mode1 includes the three parts of a whole water body. Through linking the 1-Dimensional and 2-Dimensional mathematical model, the complicated evolution for an estuary with high sediment concentration can be calcu1ated. Using the mathematical model, the computation of sediment transport under the interaction of runoff, tide and wind-driven currents and wave in the Yellow River Mouth has been carried out. Through the calculating, the law of erosion and sedimentation is ' studied. Furthermore, the bed deformation for a long period and the sedimentation areas of the river mouthes of the planned channels are calculated, too.