[CCoE Notice] Thesis Defense Announcement

[Geanangel, Jane E]

1D Morphodynamic River Modeling with a Contraction Structure
Ruosen Qian
M.S. Candidate, Dept. Civil and Environmental Engineering, University of Houston,
Houston, TX.
Date: Wednesday, July 27, 2011
Time: 10:00 am
Location: Civil Engineering Conference Room:
Thesis Committee: Kyle Strom (chair), K.H. Wang, Jerry Rogers

ABSTRACT

A 1D morphodynamic model capable of describing unsteady flow and bed evolution in
a movable-boundary river of varying width was developed. The model couples the Saint-
Venant equations with the Exner equation, and uses the finite difference McCormack scheme
with an extra dissipation step (TVD) and special source term treatment to solve the system
of equations. Inclusion of TVD and modifications to the source terms allow the model to
capture sharp discontinuities in the water surface without generating spurious oscillation
and also reduced artificial numerical oscillation due to irregular bed topography. To handle
pressurized flow in a conduit, a Preissmann slot adaptation to the code using the McCormack
scheme was also investigated. Inclusion of the Preissmann slot method was motivated
by the desire to use the model to simulate flow, sediment transport, and bed evolution near
and through a low-water-crossing system of culverts. Model performance for several cases
are presented and compared with the analytic solutions and experimental data.
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