surfer's beach erosion: army corps of engineers
TRANSCRIPT
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US Army Corps of Engineers
BUILDING STRONGSan Francisco District
North Half Moon Bay(Pillar Point Harbor), CaliforniaContinuing Authorities Program(CAP) 111 Project
Public MeetingNovember 8, 2013Half Moon Bay, CA
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BUILDINGSTRONG
US Army Corps of EngineersSan Francisco District2
2010USGS
1956USDA
Setting
2013
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Conditions on April 28, 2011
East Breakwater (180 panorama)
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1December1959
Bluff Retreat(1993 2012: ~0.5 m/yr @ Vallejo Beach)
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Post-Breakwater Changes
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Project Development Phases
CAP111: Mitigation of [FUTURE]Damages Caused by
a Federal Navigation Project New Congressional authorization is not needed
The federal funding limit is $5M
The Non-Federal Sponsor (SMCHD) shares in thecosts as prescribed in the Section 111 legislation
Completed (216 IA Report)
In Progress
100% Local Funding
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Six-Step PlanningProcess
Planning Step 1:
Identify Problems andOpportunities/Objectives
and Constraints
Planning Step 2:
Inventory and ForecastConditions (Existing andFuture Without Project)
Planning Step 3:
Formulate AlternativePlans
Planning Step 4:
Evaluate Alternative Plans
Planning Step 5:
Compare AlternativePlans
Planning Step 6:
Select the RecommendedPlan
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Evaluate Alternatives: System of Accounts
NED NATIONALECONOMICDEVELOPMENTBenefit Cost Ratio
REDREGIONALECONOMICDEVELOPMENT
Regional income & employment
EQ
ENVIRONMENTALQUALITYChanges in the ecological, aesthetic, andcultural attributes of natural and culturalresources
OSEOTHERSOCIALEFFECTS
Urban and community impacts; life, health, and safetyfactors; Displacement; long-term productivity; energyrequirements and conservation
SelectedPlan
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Examples of
NED Benefit$
Improved
recreationalopportunities
Infrastructureprotection
Improved
navigation
Propertyprotection
Habitat
protection
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Examples ofNED Cost$
Hardstructures
Softstructures
Adaptivemanagement
(managedretreat)
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CAP111 Benefit Cost Ratio (NED)
1.0 or Greater => , but economicjustification does not ensure funding e.g., if less than ~2.5 (ratio changes),
appropriation unlikely Less than 1.0 => , but
Evaluate the other accounts (RED, EQ, OSE)
Demonstration Project Different USACE authority
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Numerical Modeling of Beach Placement
Depth (m)
3935
31
27
23
19
15
11
7
3
(1)
(5)
(9)
Model Area
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Modeled erosion and accretion:Existing Conditions
June to November 2009
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Engineering Model Results:Maximum Beach Fill Scenario
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Modeled erosion and accretion:Maximum Beach Fill
June to November 2009
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Engineering Model Results:Medium Beach Fill Scenario
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Modeled erosion and accretion:Medium Beach Fill
June to November 2009
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Model Estimate of Beach-Fill Life:Medium Beach Fill Scenario (140,000150,000 yd3)
Typical year (e.g., June 2009 May 2010)
Approximately 24,000 yd3of sand will erode from the
constructed beach. Assuming several consecutive typical
years, the all of the placed sand will be gone in
approximately 6 years. However, 80 to 90% of the eroded sand will move into the
adjacent surf zone in depths of 3 to 10 feet. As a result,
approximately 4,000 yd3per year will leave the project area,
giving a total residence time of approximately 36 years. Although not yet modeled, a similar analysis for Ocean Beach
(San Francisco) shows that including an El Nio winter will
notably shorten the beach-fill lifespan.
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Study Schedule Determine final array of project alternatives
Complete project coastal and economic modeling Complete Draft Detailed Project Report (DPR) and
Environmental Assessment (EA)
Complete agency and public review of DPR and EA Finalize DPR and EA with FONSI (Finding of No
Significant Impact)
Submit final DPR and EA to the South Pacific
Division for approval If approved, request funding for Detailed Design &
Construction
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Monterey Bay National Marine Sanctuary
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Mark Bierman Project ManagerEconomist
John Dingler Project Planner
Peter Grenell Non-Federal Sponsor
Richard Stradford Environmental ManagerFrank Wu Coastal Engineer
James Zoulas Coastal Engineer
Project Development Team
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Contact Information
Mark Bierman [email protected] Dingler [email protected]
James Zoulas [email protected]
Peter Grenell [email protected] Kendall [email protected]