一、二维洪水演进数学模型在滞洪区的应用

Application of Flood Wave Advance Numeric Modeling of One Dimension and Two Dimensions in Flood Detention Area

采用无结构不规则网格技术对滞洪区地形进行自动剖分,根据三维流体动力学方程建立了适合滞洪区计算的一、二维洪水模拟模型,将地形条件概括为地面型通道、河道通道、特殊型通道和连续堤或缺口堤4种通道对方程进行了离散,利用天津市大清河滞洪区的实测资料对模型进行验证,结果吻合较好,并模拟了百年一遇洪水在本滞洪区的演进情况.为防洪减灾和经济发展提供了可靠的依据.

Topography of flood detention area is automatically plotted by nonstructural and irregular meshes technique,based three-dimension hydrodynamics equations,one-dimension and two-dimension flood simulation models are set up for the calculation of flood detention area,which summarizes the topography to four thoroughfares,such as ground thoroughfare,river channel thoroughfare,special thoroughfare and continuous dike or breach dike,and the equations are discreted.The medol is tested by survey data from the flood detention area of Daqing river in Tianjin city,the result is good,and one hundred year flooding state is simulated. These can provide a basis for flood control and reduction of natural disasters and economic development.