主槽一维和滩地二维侧向耦合洪水演进模型

Flood routing model with lateral coupling one-dimensional channel and two-dimensional floodplain simulation

为实现对复式河道大尺度漫滩洪水的快速模拟,结合洪水在滩槽行洪特点和河道一维、二维水动力学模型研究成果,在主槽与滩地分别划分为矩形和三角形网格,以左右滩唇为分界实现两网格系统嵌套;建立主槽一维水动力学数学模型,内插大断面间网格处的水力因子,在滩地采用简化的二维水动力学模型模拟滩槽间、滩地网格间水量交换,实现主槽一维与滩地二维模型侧向耦合。利用黄河下游"96·8"大洪水实测资料,对花园口至夹河滩河段洪水演进过程验证,结果表明该方法模拟精度较高,能够利用该模型模拟复式河道大漫滩洪水过程。

For the purpose of rapid simulation for bankful flood routing on large scale compound channel, based on previous studies on one-dimensional and two-dimensional flood routing models, one dimensional main channel hydrodynamic model and two dimensional hydrodynamic model were laterally coupled by simplifying and nesting main channel and flood plain with rectangle grids and triangle grids, in which water exchanges between grids, floodplain and main channel were simulated. The model was verified with a measured flood process in the lower reaches of the Yellow River numbered as flood ＂96·8＂. The simulation results for flood routing in section between Huayuankou hydrometric station and Jiahetan Hydrometric station indicate that the model performs well for simulating of bankful flood process routing on complex river channel.