One-Dimensional Hydrodynamic Model for Dam-Break Flooding
China is one of the countries severely affected by floods.Numerical modelling of flooding can accurately reflect the flood evolution and disaster-causing process.In this study,a set of one-dimensional hydrodynamic model based on the finite volume method to discretize Saint-Venant equation set in Godunov format was proposed to address the issues of modeling of flooding in natural rivers characterized by large scale,complex flow regimes,variable channel cross-section forms;it employed a method for solving the relationships between hydraulic elements of arbitrarily complex cross-sections,which accurately provided values of hydraulic elements for any complex channel cross-section during model solving.(1)All cases had ENS values greater than 0.5,demonstrating the model's good stability and adaptability.By comparison the analytical solutions obtained by the model with solutions from classical ideal cases,experimental cases,and actual engineering cases,as well as measured data,this model improved the accuracy and efficiency of one-dimensional hydrodynamic model solving,effectively reflecting the characteristics in open-channel flow with complex cross-sections.(2)Applying this model to an actual example of dam-break flooding at the Baige Dam on the Jinshajing River,the simulated peak floods and overall flood processes closely match observations.ENS values at the two measurement sites,Yebatan and Suwalong were 0.633 and 0.812,respectively,convincing the applicability and reliability of the model in practical applications.The proposed one-dimensional hydrodynamic model exhibited excellent simulation effectiveness in flooding with complex flow conditions and high suddenness.This study provides an efficient simulation for preliminary or rapid assessment of dam-break flooding risks.
river hydrodynamic modelGodunov schemeopen-channel flowcomplex cross-sectionsdam-break flooding
万方数据
维普
