圣维南一维非恒定流明渠水力学模型,该模型利用普林士曼Preismann隐格式求解，方法是追赶法和迭代法。-Saint-Venant one-dimensional unsteady flows lumens mechanical model, the model used Pulinshiman Preismann Hidden format solution is to catch up with the law and iterative method.