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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span style='font-size:12.0pt;font-family:LMRoman12-Bold'>1D Morphodynamic River Modeling with a Contraction Structure<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>Ruosen Qian<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><i><span style='font-family:LMRoman10-Italic'>M.S. Candidate, Dept. Civil and Environmental Engineering, University of Houston,<o:p></o:p></span></i></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><i><span style='font-family:LMRoman10-Italic'>Houston, TX.<o:p></o:p></span></i></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span style='font-family:LMRoman10-Bold'>Date: </span></b><span style='font-family:LMRoman10-Regular'>Wednesday, July 27, 2011<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span style='font-family:LMRoman10-Bold'>Time: </span></b><span style='font-family:LMRoman10-Regular'>10:00 am<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span style='font-family:LMRoman10-Bold'>Location: </span></b><span style='font-family:LMRoman10-Regular'>Civil Engineering Conference Room:<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span style='font-family:LMRoman10-Bold'>Thesis Committee: </span></b><span style='font-family:LMRoman10-Regular'>Kyle Strom (chair), K.H. Wang, Jerry Rogers<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span style='font-family:LMRoman10-Bold'>ABSTRACT<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><b><span style='font-family:LMRoman10-Bold'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>A 1D morphodynamic model capable of describing unsteady flow and bed evolution in<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>a movable-boundary river of varying width was developed. The model couples the Saint-<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>Venant equations with the Exner equation, and uses the finite difference McCormack scheme<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>with an extra dissipation step (TVD) and special source term treatment to solve the system<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>of equations. Inclusion of TVD and modifications to the source terms allow the model to<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>capture sharp discontinuities in the water surface without generating spurious oscillation<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>and also reduced artificial numerical oscillation due to irregular bed topography. To handle<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>pressurized flow in a conduit, a Preissmann slot adaptation to the code using the McCormack<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>scheme was also investigated. Inclusion of the Preissmann slot method was motivated<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>by the desire to use the model to simulate flow, sediment transport, and bed evolution near<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;text-autospace:none'><span style='font-family:LMRoman10-Regular'>and through a low-water-crossing system of culverts. Model performance for several cases<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-family:LMRoman10-Regular'>are presented and compared with the analytic solutions and experimental data.</span><o:p></o:p></p></div></body></html>