黄河宁夏卫宁河段一维水流数学模型应用研究

The application research on one dimensional flow mathematical model in Ningxia Weininghe section of the Yellow River

黄河宁夏卫宁河段河势变化复杂,断面型式多为复式断面,漫滩水流的滩、槽水力要素存在明显差别。采用HEC-RAS软件划分主槽和左、右滩地,分滩、槽设定糙率等参数,建立卫宁河段一维水流数学模型,推求的主槽、滩地的水深、流速、分流比等反映了河道实际水流结构,对河道整治工程具有重要的实际意义,为黄河以及其他断面型式复杂的天然河道设计水面线计算提供了重要依据。

The river regime of the Ningxia Weining reach in Yellow River is so complex that the cross section type is always complex.As a result,hydraulic elements will be different between main channel and bottomland.The cross section are divided into main channel and bottomland by the HEC-RAS software and parameters such as roughness should be set respectively in main channel and bottomland.So far one-dimensional flow mathematical model of Weining reach is set up.The water depth,flow velocity,split ratio of main channel and bottomland obtained from the model reflect the actual flow volume structure of river and they have important practical significance for the channel improvement project.Our research will provide important basis for the water line calculation of the Yellow River and other natural river with complex cross section.