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US Army Corps of Engineers

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Support to Gulf Coast Recovery

U.S. Army Engineer Research andDevelopment Center

Coastal and Hydraulics Laboratory

Mr. Bruce Ebersole

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Overview

Science and technology support to New Orleans District and Mississippi Valley Division► Flood Risk Reduction in Louisiana► Water and Sediment Diversions from the

Mississippi River► Oil Spill

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Estimation of Hurricane Surge and Wave Characteristics and Probability

Hurricane characteristics are highly variable - track, intensity, size, forward speed, far field wind speed decay

Hurricane intensity decay and filling with approach to the coast

Joint Probability Method – Optimal Sampling (JPM-OS)

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Coastal Storm Modeling SystemCSTORM-MS

Wind and Atmospheric Pressure Forcing

Storm Surge Model (ADCIRC) Wave Models (WAM and STWAVE)

(PBL model or NOAA wind products)

Coupling

Sediment Transport and Beach/Barrier Island Change (C2SHORE)

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Storm Surge and Wave Information to Design the New Orleans Hurricane Storm

Damage Reduction System

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Effects of the project itself on storm surge

With ProjectWithout Project

Morganza-to-the-Gulf Hurricane Storm Damage Reduction Project

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Effects of Sea Level Rise on Storm Surge for Without-Project Conditions

Sea Level Rise of 0.35 mPresent Sea Level

Morganza-to-the-Gulf Hurricane Storm Damage Reduction Project

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CSTORMS-MS Enables Systems Analysisof Barrier Island and Wetland Changes

Chandeleur Islands shelter the nearshore marsh environments.Therefore, degraded Chandeleur Islands degraded nearshore marsh

Caernarvon Marsh

Degraded: ~-0.6 m (NAVD88), Open water

Biloxi Marsh

Degraded: ~-0.6 m (NAVD88), Open water

Barrier Islands

Degraded to -3 m NAVD88, Open waterLake

Borgne

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Changes to Storm Surge and WavesDegraded Barrier Islands + Wetlands

Degraded minus Base

Max surge differences (m)

Max surge increased by 1-2 m and max waves increased by 1 m in Lake Borgne and over the nearshore marshes.

This leads to increased risk of overtopping at the hurricane storm damage reduction system

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Design of New Orleans Hurricane Storm Damage Reduction System Features

Seabrook Gate

Surge Barrier and Gate Complex

Western Closure Complex

Pump Stations

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Computer Simulation of Currents Using the Adaptive AdH Model

Seabrook Gate

Complex

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Laboratory Study of Navigability Through Western Closure Complex

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Ship-Tow Simulator Study of Navigability through the Seabrook Gate

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Effects of Proposed Structures on Transport of Larval Fish into Lake Pontchartrain

14

GIWW Sector Gate

Bayou Bienvenue Structure

MRGO Closure South of Bayou Bienvenue

GIWW Barge Gate

Existing Pipeline Canal

Through….

Computer Simulation of Currents

Rule-Based Particle Motions to Simulate Larval Fish Movement

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Simulation of Larval Fish Movement

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Mississippi River Diversions

Bonnet Carre Spillway

Davis Pond

Caernarvon

West Bay

• Engineering Measures to Promote Delivery of Water and Sediment into Wetlands

• Benefits to the Receiving Wetlands

• Effect on Dredging and Navigation

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West Bay and Vicinity Water and Sediment Fluxes

Broadband ADCP with bottom- tracking and GPS

P-61 sediment point sampler► Multiple locations and depths

along transects

CTD Profiler for temperature and salinity

Water samples and suspended sediment concentration analysis

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West Bay

Southwest Pass

Cubits Gap

Grand Pass

Baptiste Collette

St. Philips Bend

Pass a Loutre

South Pass

8%

11%

10%

10%

10%

11%

6%

34%

Water Delivery 100% of Belle Chase Q

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Adaptive Hydraulics (AdH) Computer Model of Mississippi River Delta Region

(hydrodynamics, salinity, sediment transport)

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Simulation of Silt Delivery through West Bay Diversion and Delta Passes

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Deep Water Horizon Oil Spill Response

Permit Evaluations► Jefferson Parish permit application for rock dikes in

Barataria Bay passes► State of Louisiana permit application for sand berm

along Chandeleur barrier islands

Effect of increased Mississippi River discharge/Old River Control structure deviation on retarding oil movement into adjacent wetlands

Fast-track application of high-resolution ADCIRC and AdH computer models for the Gulf Coast Region using high performance computing assets

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No Dikes

With Dikes

Particle Tracking Analysis5 Barataria Bay passes

Spring Tide – maximum water excursions

No-Wind Case

Velocity are increased in the passes which increases scour potential

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Chandeleur Island Sand Berm Evaluation

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Questions?