Us army corps of engineers new orleans district morganza to the gulf systemwide model l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 24

US Army Corps of Engineers New Orleans District Morganza to the Gulf Systemwide Model PowerPoint PPT Presentation


  • 103 Views
  • Uploaded on
  • Presentation posted in: General

US Army Corps of Engineers New Orleans District Morganza to the Gulf Systemwide Model. Amena Malene Henville 21 Oct 2008. Content. Systemwide Model Purpose Data Collection Points Boundary Geometry Model output Status of Systemwide Model Other ongoing or planned models in the area.

Download Presentation

US Army Corps of Engineers New Orleans District Morganza to the Gulf Systemwide Model

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Us army corps of engineers new orleans district morganza to the gulf systemwide model l.jpg

US Army Corps of EngineersNew Orleans DistrictMorganza to the GulfSystemwide Model

Amena Malene Henville

21 Oct 2008


Content l.jpg

Content

  • Systemwide Model Purpose

  • Data Collection Points

  • Boundary

  • Geometry

  • Model output

  • Status of Systemwide Model

  • Other ongoing or planned models in the area


Model purpose l.jpg

Model Purpose

  • To assess the impact of the proposed project on the general trend of flow distribution and salinity intrusion along the main channels and lakes, tributaries and distributaries in the project area

  • To develop the preliminary sizing of the Environmental Structures


Data collection points l.jpg

Data Collection Points


Usace data collection points l.jpg

USACE Data Collection Points


Boundary conditions l.jpg

Boundary Conditions

  • Filtered tidal stage fluctuations from the Gulf of Mexico

  • Various freshwater inflows from major waterways including Atchafalaya River, Wax Lake Outlet, Bayou Lafourche, and GIWW East of Larose

  • Saltwater boundary at the Gulf of Mexico

  • Uniform filtered wind fields

  • Data used collected by CEMVN and other agencies


How the het has helped l.jpg

How the HET Has Helped

  • Provided information on types of predominant vegetation in particular marsh areas to help determine Manning’s n values

  • Provided data (flow, stage, salinity) for existing and possible additional boundary conditions or points to verify or calibrate to.

  • Provided bathymetry data in areas that we did not collect data or have existing data available

  • Provided known facts about marsh areas that are part of the model

  • Had joint meeting to go through geometry in detail to find errors or erroneous details that did not match field observations


Model geometry l.jpg

Model Geometry

  • Two-dimensional elements in X,Y plane

  • 48, 960 elements

  • 171, 289 nodes

  • Element material properties

    • Peclet control or Eddy viscosity control

    • Roughness by depth or wetting and drying by marsh porosity

  • Bathymetry in Z plane

    • Results are depth averaged


Model testing and changes l.jpg

Model Testing and Changes

  • Model geometry/domain

  • Inflows

  • Initial Salinity Conditions

  • 3D Modeling of the HNC

  • Wind


Original model domain l.jpg

Original Model Domain


Current model domain l.jpg

Current Model Domain


What the model does l.jpg

What the model does…

  • The model will be able to track general changes in the velocity, stage, and salinity intrusion by directly comparing data at specific points

  • The environmental structures will be modeled as simulated openings in order to determine if the initial flows and locations are appropriate to maintain current conditions


Establish discharge capacity of environmental structures l.jpg

Establish Discharge Capacity of Environmental Structures

  • Artificial openings are created where the environmental structures are proposed

  • Flows with and without project, inside and outside the levee will be compared.

  • Openings can be resized and/or relocated so that the flow distribution remains about the same in areas that become hydraulically isolated due to project

  • Any parameter can be compared at any point between different scenarios.


Initial alternatives l.jpg

Initial Alternatives

  • Alternative 1- Model all environmental and navigational structures in open position during typical spring conditions.

  • Alternative 2- Model all environmental structures in closed position and all navigational structures in open position during typical spring conditions.

  • Alternative 3- Model all environmental structures in open position and model all navigational structures in open position with the exception of the Houma Navigational Canal (HNC) Lock Complex floodgate and lock in closed position during typical spring conditions.

  • Alternative 4- Model all environmental and navigational structures in open position during typical fall conditions.

  • Alternative 5- Model all environmental structures in closed position and all navigational structures in open position during typical fall conditions.

  • Alternative 6- Model all environmental structures in open position and model all navigational structures in open position with the exception of the HNC Complex (floodgate and lock) in closed position during typical fall conditions.


Current activities l.jpg

Current Activities

  • The model was run with various values in wind fields so that a statistical representation can be determined, since there is not sufficient or accurate enough wind data to be able to produce a representative one

  • ERDC will putting in the levee geometry and run the “Everything open” and the “Everything open except HNC Lock and Floodgate Closed” Alternatives. Completion date 21 November

  • FTN & Assoc is attempting to run the model using their RMA-11 model—Scope and cost are expected by 24 October, completion of attempt is expected within 60 days of NTP

  • ITR by CHT


Other work in this area l.jpg

Other Work in this area

  • Ad Circ Storm Modeling

  • Localized Interior Drainage (HEC RAS)

  • Systemwide Interior Drainage (UNET, HEC-RAS)

  • CH3D Modeling for the Houma Navigation Canal Deepening Feasibility Study

  • Physical Modeling of the Lock Complex


Ad circ storm modeling l.jpg

Ad Circ Storm Modeling

  • Currently setting up to run the future conditions model.

  • MLODS Existing grid scheduled to be completed 14 November and statistics 13 April

  • MLODS Future grid scheduled to be completed 21 November and statistics 24 April


Interior lakes and project alignment l.jpg

Interior lakes and project alignment


Localized interior drainage models l.jpg

Localized Interior Drainage Models

Grand Bayou Canal

Bayou du Large

Bayou Pointe aux Chenes

Bayou Terrebonne

Montegut

G-1


Status of localized interior drainage models l.jpg

Status of Localized InteriorDrainage Models

Bayou Terrebonne was eliminated because of existing local levees, MTOG will not impact interior drainage

Completed

  • Bayou Pointe aux Chenes

  • Montegut Wetland Area

  • G-1 Area

    Pending Completion

  • Bayou Du Large

  • Grand Bayou Canal @ GIWW


Ch3d model l.jpg

CH3D Model

The model was used assess the effects of the HNC being deepened from -14 ft NAVD88 (-15 ft MLG) to -18 ft and -20 ft NAVD88

Specifically:

1. The impact on the flow distribution at the junction of the GIWW and HNC during low and high freshwater flow events.

2. The impact on the flow distribution at the Bayou Grand Caillou (BGC) and HNC junction during low and high freshwater flow events.

3. The impact on salt water intrusion along the HNC and HNC’s tributaries and distributaries.

4. The operation of the HNC Lock Complex to increase flow along the BGC during low flows.

Current effort is complete but utilized along with average flow year salinities and high flow month salinities will provide a broad range of conditions and information that is critical to developing the Houma Navigation Canal Lock Structure Operating Plan to minimize salinity intrusion at the Houma Water Treatment Plant.


Localized adh 2 d structure modeling l.jpg

Localized ADH 2-D Structure Modeling

Completed

Bayou Pointe aux Chenes

Bush Canal

Pending Completion

Bayou TerrebonneBayou Petit Caillou

Lapeyrouse Canal?Bayou Du Large

Falgout CanalGIWW West of Houma

GIWW East of LaroseGrand Bayou

Humble Canal


  • Login