Accession Number:

AD1082162

Title:

Hydrodynamics in the Morganza Floodway and Atchafalaya Basin, Report 2: Phase 2

Descriptive Note:

Technical Report

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS VICKSBURG United States

Report Date:

2018-12-01

Pagination or Media Count:

134.0

Abstract:

The Morganza Floodway and the Atchafalaya Basin located in Louisiana west of the Mississippi River were evaluated using a two-dimensional Adaptive Hydraulics model. The study was conducted to determine the extent and timing of flood inundation throughout the study area. The input hydrograph covered a range of flows through the Morganza Control Structure that included the 2011 flood as well as the low end of flow values up to the Standard Project Flood of 600,000 cfs. Hydraulic roughness values were set for pre-2011 flood conditions. Prior to this study, a Phase 1 initial model study was completed that included only the Morganza Floodway down to Highway 190. This study Phase 2 incorporates the Phase 1 study area along with the system south of Highway 190 down to Morgan City as well as the entire Atchafalaya Basin from Simmesport to Calumet. After the model was calibrated to the 2011 flood event, three separate alternative simulations were performed. These alternatives are the beginning of a collection of runs that detail how the floodways will respond given certain boundary conditions.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE