building strong ® us army corps of engineers building strong ® support to gulf coast recovery u.s....
TRANSCRIPT
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BUILDING STRONG®
US Army Corps of Engineers
BUILDING STRONG®
Support to Gulf Coast Recovery
U.S. Army Engineer Research andDevelopment Center
Coastal and Hydraulics Laboratory
Mr. Bruce Ebersole
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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
Storm Surge and Wave Information to Design the New Orleans Hurricane Storm
Damage Reduction System
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BUILDING STRONG®
Effects of the project itself on storm surge
With ProjectWithout Project
Morganza-to-the-Gulf Hurricane Storm Damage Reduction Project
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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
Computer Simulation of Currents Using the Adaptive AdH Model
Seabrook Gate
Complex
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BUILDING STRONG®
Laboratory Study of Navigability Through Western Closure Complex
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BUILDING STRONG®
Ship-Tow Simulator Study of Navigability through the Seabrook Gate
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BUILDING STRONG®
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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BUILDING STRONG®
Simulation of Larval Fish Movement
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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
Adaptive Hydraulics (AdH) Computer Model of Mississippi River Delta Region
(hydrodynamics, salinity, sediment transport)
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BUILDING STRONG®
Simulation of Silt Delivery through West Bay Diversion and Delta Passes
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BUILDING STRONG®
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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BUILDING STRONG®
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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BUILDING STRONG®
Chandeleur Island Sand Berm Evaluation
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BUILDING STRONG®
Questions?