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https://hdl.handle.net/11681/22562| Title: | Merriwether-Cherokee Potamology Study |
| Authors: | Hall, Brian M. Gaines, Roger A. Lin, L. Yu Waller, Kandi H. |
| Keywords: | Cutoff formation Geomorphic assessment Levee Breech Mississippi River Navigation Navigation assessment Numerical modeling Overbank scour Potamology Sediment transport |
| Publisher: | United States. Army. Corps of Engineers. Mississippi Valley Division. Engineer Research and Development Center (U.S.) United States. Mississippi River Commission. United States. Army. Corps of Engineers. Memphis District. |
| Series/Report no.: | MRG&P;Report No. 9 |
| Abstract: | Abstract: This report documents the analysis performed for the Merriwether-Cherokee Potamology Study. The investigation included the following: infrastructure analysis, Low Water Reference Plane analysis, thalweg and tertiary layer analysis, volumetric analysis, specific gage analysis, duration analysis, multidimensional modeling analysis, one-dimensional modeling analysis, and a navigation assessment. A concern was that without modification of the western spur levee and Island 13 overbank, the Mississippi River will continue to form a 9-mile cutoff. If a cutoff were to form, potential adverse impacts include changes in long-term reach dynamics, navigation outdraft conditions, increased dredging operations, hydrodynamic condition changes in close proximity to a Mississippi River Levee mainline levee (Tiptonville-Obion Levee), endangerment of existing channel improvement features ($60M), endangerment of completed crevasse repairs ($27M), and endangerment of planned crevasse repairs. The analysis conducted on the base condition indicated that there is a moderate risk for cutoff formation. Alternatives were investigated to mitigate the risk for cutoff formation. The analysis conducted on the base condition indicated that there is a severe risk for local scour at the closure structure. Local scour countermeasures were investigated to mitigate the risk of closure structure failure. |
| URI: | http://hdl.handle.net/11681/22562 http://dx.doi.org/10.21079/11681/22562 |
| Appears in Collections: | MRG&P Report |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| MRG&P Report No 9.pdf | 295.24 MB | Adobe PDF |  View/Open |