Dredging Alternatives Study Cubits Gap, Lower Mississippi River. Report 2. TABS-2 Numerical Model Investigation, Volume 2. Appendix B
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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This investigation of the Mississippi River in Louisiana used the TABS-2 finite element numerical model RMA-2V for hydrodynamic analysis and STUDH for sediment transport computation. A large-flow 87-day hydrograph was used to determine the performance of each plan. Results from the mathematical models of sedimentation showed that the best nonstructural plan was advance maintenance such as dredging. It provided a smaller quantity of shoaling than the sediment trap plan and affected a smaller area of the navigation channel. Both nonstructural plans, however, would increase the channel shoaling rate compared to existing conditions. For the structural plan, Plan 1 with a 2.800-ft-long angle dike and 800-ft-long headland dike provided the least amount of shoaling of any plan tested. All three dike plans tested would result in a substantial reduction in channel shoaling. Results from the hydrodynamic modeling showed that dike plan 1 returned the flow distribution at Cubits Gap to the amount expected with the supplement II works in place. This study did not address long- term sedimentation effects within Cubits Gap.
- Hydrology, Limnology and Potamology
- Civil Engineering