Three-dimensional flood routing of a dam break based on a high-precision digital model of a dense urban area

摘要: Dense buildings are the major factor affecting urban flood routing. Currently, study of dam-break routing primarily focuses on a simplified terrain model and 2D shallow water equations, which ignore effects dense buildings. Furthermore, complex interactions between wave wall surfaces not reflected in results. To tackle these problems, three-dimensional with high-precision digital an area is studied this paper. Firstly, vector data various land types extracted from remote sensing image, NURBS algorithm based TIN introduced to construct model. Coupled model, established. Next, \(k{-}\varepsilon\) turbulence proposed for simulation. A polyhedral grid second-order accuracy discrete format used divide area, governing equations solved using PISO algorithm. Finally, superiority 3D mathematical computational efficiency mesh validated according experiments Testa Soares-Frazao. An reservoir, located SZ City, China, modelled show that exhibits significant characteristics. Moreover, due surrounding buildings, phenomena, including collision, reflection vortices.