Merriwether Cherokee Potamology Study
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2017
- Accession Number
- AD1037493
Entities
People
- Brian M. Hall
- Roger A. Gaines
Organizations
- Memphis District, U.S. Army Corps of Engineers