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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 assessment
Numerical modeling
Overbank scour
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.
Appears in Collections:MRG&P Report

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