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https://hdl.handle.net/11681/13267| Title: | Hydraulic characteristics of Rigolets Pass, Louisiana, hurricane surge control structures: hydraulic model investigation |
| Authors: | United States. Army. Corps of Engineers. New Orleans District Berger, Rutherford C. Boland, Robert A. |
| Keywords: | Control structures Hydraulic structures Rigolets Pass Hydraulic models Steady-state flow Lake Borgne Water currents Lake Pontchartrain Louisiana |
| Publisher: | Hydraulics Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-76-16. |
| Description: | Technical Report Abstract: The Rigolets model was a fixed-bed model constructed to undistorted linear scale ratios of 1:100 horizontally and 1:100 vertically. The region reproduced by the model is 3.2 miles of the Rigolets, starting at the Lake Pontchartrain entrance of the Rigolets. The model was equipped with the necessary appurtenances for reproduction of steady-state flow in both ebb and flood directions and accurate measurement of water-surface elevations and currents under this condition. Verification tests were conducted to make certain that the model hydraulic regimen agreed with that of the prototype. The agreement attained between water-surface elevations and current velocities from similar model and prototype conditions was considered satisfactory. The testing program consisted of water-surface elevations, current velocities, and surface current patterns for various control structure plans. Plan 1 tested in the Rigolets model is identical to the plan that was tested in the Lake Pontchartrain model in the Rigolets Pass, the results of which were published in Technical Report No. 2-636, "Effects on Lake Pontchartrain, Louisiana, of Hurricane Surge Control Structures and Mississippi River-Gulf Outlet Channel." That report concluded that the hurricane control structures would not significantly affect the hydraulic or salinity regimen of Lake Pontchartrain. Test results showed plan 2 to be about equal in discharge capability with plan 1, while plans 2A and 2B were judged superior in discharge capability compared with plan 1. Possible scouring problems near the Fort Pike State Monument were noticed during testing of plans 2, 2A, and 2B. To remedy this situation a modification to plan 2A was made. The structure was shifted 250 ft away from the Fort Pike bank of the Rigolets Pass. This modification is referred to as plan 2A-1. This plan proved to have superior discharge capability relative to plan 1 as well as to reduce possible scouring problems near the Fort Pike State Monument. Additional data which were taken for each plan in the navigation canal with the lock open are presented in Appendix A. |
| Rights: | Approved for public release; distribution is unlimited. |
| URI: | http://hdl.handle.net/11681/13267 |
| Appears in Collections: | Technical Report |
