| Type of Document |
Master's Thesis |
| Author |
Dill, Nathan Lamont
|
| Author's Email Address |
ndill1@lsu.edu |
| URN |
etd-06142007-084318 |
| Title |
Hydrodynamic Modeling of a Hypothetical River Diversion Near Empire, Louisiana |
| Degree |
Master of Science in Civil Engineering (M.S.C.E.) |
| Department |
Civil & Environmental Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Clinton S. Willson |
Committee Chair |
| Donald Dean Adrian |
Committee Member |
| Zhi-Qiang Q. Deng |
Committee Member |
|
| Keywords |
- sms
- maureparticle
- roughness by depth
- retention time
- sensitivity analysis
|
| Date of Defense |
2007-05-11 |
| Availability |
unrestricted |
Abstract
Hydrodynamic models of a hypothetical Mississippi river diversion near Empire, LA are constructed using two popular finite element codes RMA2 and ADCIRC. In a series of simulations eddy viscosity parameters and bottom friction parameters are varied. Constant boundary conditions, discharge inflow and elevation outflow, are applied and water surface elevation and velocity solutions at fully developed flow are taken as steady-state results. A particle tracking code is developed and applied to the velocity solutions to aid in flow field comparisons. The results elucidate the model sensitivities to the varied parameters, and also provide for a comparison of the two different models. Both models show similar sensitivities to the eddy viscosity and bottom friction parameters. It is shown for both models that there is a minimum value of eddy viscosity that will produce stable results. Above this value cross-channel velocity gradients are flattened throughout the domain as the eddy viscosity is increased leading to results which may under-predict peak channel velocities. Particle tracking simulations show that the flow field is not significantly affected by varying the eddy viscosity. Increasing the bottom friction coefficients causes an increase in Water Surface Elevation(WSE) gradient across the domain. Steeper WSE gradients lead to small changes in the overall flow distribution, and median residence time, as can been seen with particle tracking results. Also increased WSE due to increased bottom friction causes model specific differences in the flow field due to the application of different wet/dry algorithms in the different models.
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| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
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| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
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Dill_thesis.pdf |
2.25 Mb |
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