HR: 0800h
AN: H11C-0678    [Abstracts]
TI: Numerical Modeling of Dam Break/Removal Hydraulics and Morphology
AU: * Li, S
EM: sul19@psu.edu
AF: Pennsylvania State University, 212 Sackett Bldg., University Park, PA 16802, United States
AU: Duffy, C J
EM: cxd11@psu.edu
AF: Pennsylvania State University, 212 Sackett Bldg., University Park, PA 16802, United States
AB: Dam break hydraulic is drawing increasing attention due to the potential occurrence of extreme hydrological events as result of climate change and its catastrophic nature (Cao et al, 2004). On the other hand, many dams have been removed and more are under consideration of removal (Cui et al., 2006). Both dam break and dam removal have the same essential properties such as rapid varying flows and discontinuities, releases of sediment from reservoir to downstream etc. A numerical model that couples the water flow and sediment transport processes is developed to simulate the hydraulics and the induced sediment transport and morphological evolution following dam break/removal. The systems of equations are reformulated in conservation form to correctly capture the solutions. Four numerical schemes including slope-limiting second- order upwind methods (Roe's and HLLC) and center method (Kurganov-Tadmor), and composite method (LWLF4) are tested under different hydrological events. A third-order total variation diminishing Rugne-Kutta method is used for the time integration. The numerical simulations give insight into the processes and consequences of releases of reservoir flow and sediment which is important for economics, safety, and environmental ecology. Computed results are compared with experimental or published numerical solutions to examine the limitations of the numerical schemes.
DE: 1808 Dams
DE: 1849 Numerical approximations and analysis
DE: 1857 Reservoirs (surface)
DE: 1862 Sediment transport (4558)
SC: Hydrology [H]
MN: 2007 Fall Meeting