Accession Number:

ADA533717

Title:

Seabrook and Borgne Alignment Construction Sequence Hydrodynamic Study

Descriptive Note:

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB

Report Date:

2010-12-01

Pagination or Media Count:

82.0

Abstract:

The U.S. Army Corps of Engineers USACE Hurricane Protection Office HPO is authorized to provide New Orleans, Louisiana, with a risk reduction system for the one percent exceedance flood HSDRRS. The purpose and need for the proposed action is to provide, in a timely manner, the 100-year level of risk reduction from flood damage to the areas surrounding the IHNC due to flooding from hurricanes and other severe storm events. This risk reduction is being accomplished through the construction of a comprehensive system of levees, gates, and drainage structures. Several planned structures to be located along the levee system allow for continued navigation in the Inner Harbor Navigation Canal IHNC, Bayou Bienvenue, and the Gulf Intracoastal Waterway GIWW. The IHNC Seabrook, Bayou Bienvenue, and GIWW gate structures are designed to remain open during normal tidal conditions with the ability to close during surge events. Numerical model studies were performed by the USACE Engineer Research and Development Center ERDC Coastal and Hydraulics Laboratory CHL to assess the impacts of these navigation structures on hydrodynamics and larval transport. HPO requested that ERDC also perform a numerical modeling study for the purpose of analyzing the temporary construction impacts of proposed HSDRRS measures to be placed in the GIWW and the Mississippi River Gulf Outlet MRGO. The work presented in this report documents hydrodynamic modeling and analysis of two construction sequence plans which will occur during the construction of the Borgne alignment and Seabrook structures included in the HSDRRS. This report specifically focuses on the construction sequence plans during which the Bayou Bienvenue structure and GIWW sector gate are being built as well as the construction of the Seabrook structure. The February 2010 plan includes cofferdams on the Bayou Bienvenue

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE