Accession Number:

ADA231650

Title:

Dredging Alternatives Study Cubits Gap, Lower Mississippi River. Report 1. TABS-1 Numerical Model Investigation

Descriptive Note:

Technical rept.

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB

Personal Author(s):

Report Date:

1991-01-01

Pagination or Media Count:

78.0

Abstract:

A numerical model of the Mississippi River between Reserve, Louisiana, at river mile 140.8, and East Jetty, LA, at river mile -19.6, was conducted to evaluate dredging alternatives in the Cubits Gap and Head of Passes reaches. The TABS-1 one-dimensional model was used. The model was adjusted to reported dredging quantities in Southwest Pass over a period of several years. The model was circumstantiated by reproducing dredging at Cubits Gap in 1989. An 11-year hydrograph was used to determine annual dredging requirements for existing conditions. Alternatives that included advance maintenance, a sediment trap, and water flow reduction in Cubits Gap were compared to existing conditions. The advance maintenance and Cubits Gap flow reduction alternatives were determined to be the most effective in terms of the percent of time that project depth could be maintained. The reduction of water flow provided for a significant decrease in total dredging requirements.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE