Accession Number:

AD1037493

Title:

Merriwether Cherokee Potamology Study

Descriptive Note:

Technical Report

Corporate Author:

ARMY ENGINEER DISTRICT MEMPHIS TN MEMPHIS

Personal Author(s):

• Hall,Brian M.
• Gaines,Roger A.

Report Date:

2017-05-01

Pagination or Media Count:

628.0

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.

Descriptors:

• CIVIL ENGINEERING
• LEVEES
• Potamology
• navigation
• MISSISSIPPI RIVER
• sediments
• channel flow
• volumetric analysis
• GEOMORPHOLOGY
• HYDRODYNAMICS
• infrastructure
• army corps of engineers

Subject Categories:

• Civil Engineering
• Hydrology, Limnology and Potamology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE