SUSTAINABLE SEDIMENT MANAGEMENT AND DREDGING … · 2019-03-29 · Sustainable Sediment Management and Dredging Seminar 6-8 Mar 2019 Sausalito, CA UNCLASSIFIED // FOR OFFICIAL USE

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Regional Sediment Management: Opportunities and ChallengesKatherine BrutschéProgram Manager, National Regional Sediment Management

SUSTAINABLE SEDIMENT MANAGEMENT AND DREDGING SEMINAR6-8 MARCH 2019 SAUSALITO, CA

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UNCLASSIFIED

UNCLASSIFIED

Distribution C: Distribution authorized to U.S. Government Agencies and their contractors; Vulnerability Information; January 2015. Other requests for this document shall be referred to US Army ERDC, ATTN: CEERD-GSV, 3909 Halls Ferry Rd., Vicksburg, MS 39180-6199.

US Army Corps of Engineers • Engineer Research and Development Center

Sustainable Sediment Management and Dredging Seminar

6-8 Mar 2019 Sausalito, CAUNCLASSIFIED // FOR OFFICIAL USE ONLY

…At a cost of more than $1 Billion per year

…..The Corps moves 200 Million cu yds of sediment annually

US Navigation ChannelsO&M & New Work Volumes and Cost

Broward Co Shore Protection ProjectCost of Sand




Regional Sediment ManagementEstablished 1999, CERB Charge

“A systems approach using best management practices for more efficient and effective use of sediments in coastal, estuarine, and inland environments for healthier and more resilient systems.”

• Recognizes sediment as a valuable resource• Work across business lines, projects, and authorities to create short and long-term economically

viable and environmentally sustainable solutions• Improve operational efficiencies and natural exchange of sediments• Consider regional implications of project scale actions and benefits• Apply/Enhance tools and technologies for regional approaches• Share lessons learned, information, data, tools, and technologies• Communicate and collaborate




RSM Goals and Strategies

• Keep sediments in the system• Mimic natural sediment processes• Reduce unwanted sedimentation• Environmental enhancement• Maintain & protect infrastructure

ReduceUpland/CDF

Disposal

BypassBackpassSediments

Ecosystem Habitat

Restoration

Reduce Erosion

SaveCapacity

Stabilize StructuresReduce

ChannelShoaling

ReduceRunoff




RSM Process




Sediment Budgets• Sediment Budget Analysis System (SBAS)• Sediment Impact Analysis Methods (SIAM)

Sediment Budget Portal

Sediment Budget Database

Regional Sediment Budget

Anna Jalowska, UNC-CH




Models for RSM• Sediment sources and sinks• Regional processes and trends• Multiple interacting projects• Connect beaches & inlets• Connect rivers & reservoirs• Navigation channel maintenance• Evaluate local/regional RSM strategies

water levels, m

-0.400-0.300

-0.200

-0.100

-0.000

0.100

0.200

0.300

0.400

ADCIRC: Storm Surge & Circulation

CMS

ADH: Watershed Analysis

STFATE-LTFATE

HEC-RAS: River Analysis Dredge Material Placement

GenCade: Shoreline Change Sand TransportMorphology Change

Bank Stabilization




GenCade• Regional shoreline change, sand transport,

inlet-sand sharing model• Connects multiple beaches & inlets• Multiple sources & sinks• Regional trends• Evaluate regional strategies

GenCade & SBAS Integration

Automate Output to SBASVolume changeTransport ratesDredging and beach fill volumesCells and fluxes

GenCade SBAS




SAC, SPNMVD

FRF

Sediment Analysis and GeoApp (SAGA)http://navigation.usace.army.mil/SEM/Analysis

Visualize distribution of detected chemicals

Symbolize sites based on average grain size

Isolate sites based on attributes

Determine volume of material at specified depths

Mapped Sites

• Show distribution of sampling sites• Filter sites based on sediment

characterization testing• View navigation channels or

placements areas

Tools

• Compute Grain Size statistics with data not yet stored in SAGA (Sieve size distribution testing)

Site Details

• Retrieve testing results• View documents• Access stratigraphy




CE-Dredge Decision Support ToolIntegrated, Comprehensive Approach for Strategic Dredged Mat’l Mgmt

National ChannelFramework

BUADMM &Ecological Data Synthesis

CSAT

eHydro

Dredging & Placement Optimization

LIDAR &Landscape

Metrics

Placement Areas: Color Coded By Capacity

Channel Shoaling

ChannelSurveys

Benthic Mapping

Placement Areas: Color Coded

By BU

Sediment SamplesOil & GasLeases

Oyster Beds

Beneficial Use Opportunities

Sediment Data & Tools

Navigation Channels

IENC




Nearshore Berm Research, Guidance, and Tools

Assateague Island, MD

Ft. Myers

Egmont

Pensacola

Vilano

SMTPreliminary tool: educated decisions w/limited dataEstimates Frequency of sediment mobility On/Offshore migration direction Dominant axis of wave direction to estimate

alongshore migration

d50(mm)

Frequency of Mobilization

Predicted Sediment Migration

0.1 16 – 38% 83% Offshore0.2 14 – 30% 60% Onshore0.3 12 – 26% 84% Onshore

http://navigation.usace.army.mil/SEM/SedimentMobility

Berm Database

South PadreIsland




Thin Layer Placement of Dredged SedimentsOpen Water Placement

Mobile Bay(Interagency Working Group)

Mouth of the Columbia River(Lower Columbia River Solutions Group)

Understand Behavior - Mobilization, Transport, ConsolidationBenthic Habitat - Reduce Impacts & EnhanceShallow Emergent Tidal Marsh Habitat Dredge Hole filling - Recover Hypoxic & Anoxic Zones

ODMDS




Historical Navigation Sediment Utilization:Where, when, volume of sediments placed beneficially? Where can we improve?

District Data 1998-2017Coastal Navigation Projects• 3 Bcy• 36% placed beneficially• 9 Mcy/yr placed on beaches• 5 Mcy/yr Unknown




Riverine and Reservoir RSMSedimentation Impacts at the Confluence

of the Sangamon and Illinois RiversFall Creek, Cherry Creek, Spencer Dam

Reservoir Flushing Spencer Dam

• Monitoring and Model Enhancements• Impacts & Benefits Increased

Sediments Below Reservoirs

Innovative Reservoir SedimentBypassing Techniques

Reduce SedimentationBeneficial Use

Shoreline RestorationEnvironmental Restoration

Consequences of Channelization Land Use Impacts

Stakeholder Collaboration

FRM

ENV

NAV




Mobile District RSM Domain

375-miles of Shoreline21 Federal Projects

8 State Parks 7 Military Installations

Gulf Islands National SeashoreHarrison County Beach Fill

Panama City Beach FillLocal Projects

WRDA86: Place all dredged sediments in ODMDS

- 4.0 Mcy/yr, Hopper Dredge, 20-Miles- Tripled maintenance costs

2014 Decision reversed- ERDC Tools and Technologies - RSM Interagency Work Group




Regional to Local Opportunities

Sub-Region 9 Sub-Region 7 Sub-Region 5 Sub-Region 3 Sub-Region 1

Sub-Region 8 Sub-Region 6 Sub-Region 4 Sub-Region 2

Mobile BayDauphin Island

Perdido Pass

Pensacola PassEast Pass

Panama City Beaches

Port St JoeMexico Beach

Alligator Point

Apalachicola BayWalton CountyBeaches

Shell Island

Regional Sediment Management Domain




Understanding the RegionMobile District Sediment Budget

Sediment Budget Analysis System (SBAS)

Sediment Impact Analysis Methods (SIAM)




Evaluating RSM StrategiesMobile Bay O&M Dredged Material BU Alternatives

• Upper-bay• In-bay placement• Thin layer placement

• Lower Bay• ODMDS

• Various ERDC tools and technologies used to evaluate each alternative

SEDFLUMESediment SamplesAnalysis

SEDZLJSediment Transport

ADCIRCCirculation

Surge

STWAVEWaves

STFATE-LTFATE

GenCade: Shoreline Change Sand TransportMorphology Change

ADH: Watershed AnalysisHEC-RAS: River Analysis




Regional RSM Strategy and ConstructionMobile Bay RSM Strategy

$12 Million in Annual Value• Fill Brookley Dredge Hole• Gaillard Island

• Marsh creation• Biogradable containment of

sediment• In-bay thin layer placement• Fill mined Oyster Holes• Sand Island Beneficial Use

• No ODMDS Placement• Dredged material from upper

end used to help reduce erosion along the island




Communicate and CollaborateMobile District Interagency RSM Team

• Alabama Department of Conservation and Natural Resources (ADCNR), State Lands Division

• ADCNR, Marine Resources Division• Alabama Department of

Environmental Management (ADEM)• Alabama State Port Authority• U.S. Fish and Wildlife Service• NOAA, National Marine Fisheries

Service• Alabama/Mississippi Sea Grant• Mobile Bay National Estuarine

Program• Mobile District• ERDC




Challenge Prevent “wasting” sediment to the DWS Protecting public investment (Jetty) Shoreline erosion Protect benthic habitat

GoalsImplement NWP RSM Strategy Keep sediment in the littoral cell (BU) Obtain/place new nearshore sites Protect South Jetty Root Dune Building: Sand Fencing Lower Maintenance Dredging Costs/Cycle Time Increased Habitat Opportunities for Benthics Stakeholder collaboration $110,000 cost savings/season South Jetty Site Additional Cost Savings/Environmental Benefits TBD

Mouth of the Columbia RiverPOC Jarod Norton

1939

Benson Beach *

* head of jetty in 2002

2002

*




Seattle District, Ediz Hook Post-dam removal shoreline change analysisPOC: David R. Michalsen, P.E.

22

BLUF: Two dams on the Elwha River were removed in late 2011, sending a large pulse of sediment into the Elwha River Littoral Cell (ERLC). Ediz Hook located at the downdrift end of the ERLC began a beach nourishment program in 1978 to mitigate for loss of sediment supply from the delta and shoreline armoring. Now that sediment from the ER delta has been restored, we are investigating how this large sediment pulse will affect O&M of Ediz Hook over the next 50-year life cycle

Approach to Address Problem• Determine if O&M demands will decrease & if so when will this

occur?• Can sand/gravel vs. cobble be utilized in future nourishment(s) to

increase habitat value?• Develop sediment budget over ERLC• Perform shoreline change modeling to help guide future

management decisions

Problem Statement/Issue• Ediz Hook protects the only deep-draft NAV channel on the Strait of

Juan de Fuca• USCG has a strategic air station on Ediz Hook for S&R• O&M program partners with City of Port Angeles to renourish Ediz

Hook with cobble ~5-10 years. O&M funding and cost-share $$ are not routinely available (deferred maintenance)

• Loss of nearshore habitat due to beach coarsening




What is the value of RSM?• More Efficient Project Execution

• Reduced lifecycle costs• More project execution (low use)

• Utilizing Sediment Resources for Healthy Systems• More sustainable and resilient coastal and riverine shorelines,

ecosystem and aquatic habitats

• Build Institutional Knowledge• Improved post-storm recovery• Better data, tools, models available

• Relationship Building• Across USACE• Nationwide engagements across business lines and communities

of practice• Stakeholder/Resource Agency Communication and Participation




Questions

• What would an RSM Plan look like for your District?• What strategies are you already using? What innovative strategies

could also be included?• What are your roadblocks for beneficial use?• How can we move past these roadblocks to implement RSM?

• RSM Team? Stakeholder workshops/meetings?• Quantification of benefits

• Show no action vs. potential RSM action




Regional Sediment Management = Resilient Healthy Systems

Regional Sediment BudgetsLocal Actions=Regional Benefits

Fine Sediment Losses

RSM Collaboration 2000-2016

FSBPA

Thin-Layer Placement

Ecosystem Value

Nearshore Placement

Data Management and Access Guidance, Lessons Learned

Documents

SUSTAINABLE SEDIMENT MANAGEMENT AND DREDGING … · 2019-03-29 · Sustainable Sediment Management and Dredging Seminar 6-8 Mar 2019 Sausalito, CA UNCLASSIFIED // FOR OFFICIAL USE