4TH ANNUAL CAPE COASTAL CONFERENCE

Putting Regional Sediment Management into Action: Dealing with Natural, Political and Municipal Boundaries

Moderators: Mark Borrelli: Center for Coastal Studies Tonna-Marie Rogers: Dept of Conservation/Recreation

Panel: John Ramsey: Applied Coastal Research and Engineering Brad Washburn: MA Office of Coastal Zone Management Ted Keon: Town of Chatham Heather McElroy: Commission 4TH ANNUAL CAPE COASTAL CONFERENCE

Putting Regional Sediment Management into Action: Dealing with Natural, Political and Municipal Boundaries (75 minutes)

I. Coastal Processes 101 (10-15 minutes)

II. RSM Introduction (~5 minutes each) 1. Modeling Tools for RSM 2. Developing Sediment Budgets 3. CZM’s Perspective 4. Chatham’s Sediment Management Activities

III. Panel/Audience Discussion (~30-40 min) Waves

• 1 cubic meter of seawater = 1 metric tonne

• On average a wave hits the shoreline every 6 seconds – 600/hr – 14,400/day – 5.2 million/year Longshore Sediment Transport Rates of Longshore Sediment Transport

• ~500,000 cubic yards of LST/year • ~1370 cubic yards of LST/day • 137 Dump Trucks sand/day rolling down beach • One every ~10 minutes! Cross-shore Sediment Transport Seasonal Changes to Beach

Fair-weather (Summer) Profile

Storm (Winter) Profile ‘Dynamic Equilibrium’

Erosion Relocation Control Structures

Seawalls and Sediment Transport

People at the think….differently

The Real Problem 4TH ANNUAL CAPE COASTAL CONFERENCE

Putting Regional Sediment Management into Action: Dealing with Natural, Political and Municipal Boundaries

John Ramsey: Applied Coastal Research and Engineering 4TH ANNUAL CAPE COASTAL CONFERENCE

Modeling Tools for Regional Sediment Management

John Ramsey, P.E. Applied Coastal Research and Engineering Some General Thoughts on Modeling

• Models Depend on the Quality of Input Data (Garbage In = Garbage Out)

• The “Wow” Graphics Factor Can Often Obscure Model Shortcomings

• Coastal Processes Modeling Is Most Appropriate for the Short-Term A Note on Our Local Conditions

Wave Exposure Average Tide Range open ocean > 8 ft protected 4-8 ft < 4 ft Shoreline Change Analysis

1938-2010

Shoreline Change Analysis

2004-2014

Surface Modeling – Spectacle Island

deposition

scour (erosion) Study Area

Coastal Processes – Wave Modeling

Nantucket Model Grid 32 Wave Cases

Coastal Processes – Wave Modeling

Sediment Transport Modeling

Cockle and Ridge- vale Beaches

Cockle Cove Calibration

Calibration Period

1994-1999

Cockle Cove Beach Nourishment

28,000 Cubic Yards 1,000 ft Length

4TH ANNUAL CAPE COASTAL CONFERENCE

Putting Regional Sediment Management into Action: Dealing with Natural, Political and Municipal Boundaries

Mark Borrelli Center for Coastal Studies

Developing Sediment Budgets

Littoral SINK Cells

SOURCE SOURCE Sources SINK SOURCE And Sinks

NET Direction SINK

19332010

Surface Difference

2010-11

1933

~15ft

1868

From, C. Sherwood and. Foster USGS (pers comm)

4TH ANNUAL CAPE COASTAL CONFERENCE

Putting Regional Sediment Management into Action: Dealing with Natural, Political and Municipal Boundaries

CZM Perspective…

Brad Washburn, Assistant Director [email protected]

Coastal Hazards Commission & Coastal Erosion Commission

• Coastal Hazards Commission (2007) - review of coastal hazards policies/practices - recommendations to implement regional sand management program (inter-agency communication, resource mapping, etc.)

• Coastal Erosion Commission (2015) - document levels/impacts of coastal erosion - strategies and recommendations to reduce or minimize coastal erosion and its impact on property, infrastructure and beaches

CZM Shoreline Change Project

• Uses historical and modern data to depict “shorelines” for selected time frames (mid 1800’s to 2009)

• Appx. 26,000 transects along entire coast

• Planning tool that provides insight into historical migration of shorelines and erosional hotspots

Coastal Structures Inventories Ocean Plan

• Preliminary compatibility assessment and screening analysis identifying potential offshore sand resource areas for further investigation

• Recommended formation of Offshore Sand Task Force

CZM Coastal Resilience Grants Advance local efforts to manage coastal flooding, erosion, and sea level rise impacts through communication and public outreach initiatives, vulnerability assessments, planning activities, engineering projects, and natural storm damage protection approaches. www.mass.gov/czm/stormsmart

• FY14: $2.0 M, 19 awards • FY15: $2.7 M, 18 awards • FY16: $2.2 M, 16 awards • FY17: $1.8 M, 19 awards CZM Coastal Resilience Grants

Century Scale Sediment Budget: Towns of Sandwich and Barnstable – Volume, rate and direction of sand moving along shoreline from Cape Cod Canal to .

CZM Coastal Resilience Grants

Nearshore Sediment Borrow Source for Sandwich Town Beaches – Analyze locations adjacent to Scusset Beach to determine viability to serve as sediment source for beaches downdrift of Cape Cod Canal jetties

Cape Cod Canal Dredging – Sandwich Town Neck Beach Nourishment

CAPE COD CANAL Project Depth: 32’ MLLW Last Dredged: 2010 Dredging Quantity: 170,000 cy Areas Material Type: Sand & Gravel Equipment Type: Hopper Disposal Sites: Cape Cod Canal Disposal Site or Sandwich Beach

NEXT STEPS…

Continued coordination at all levels – Planning, project review & permitting

Continued support to municipalities – Grant funding – Technical assistance

Continued development of planning & technical resources

4TH ANNUAL CAPE COASTAL CONFERENCE

Putting Regional Sediment Management into Action: Dealing with Natural, Political and Municipal Boundaries

Ted Keon Town of Chatham REGIONAL SEDIMENT MANAGEMENT: Implementation at the Local Level Ted Keon, Town of Chatham Atlantic Ocean

Chatham NearshoreHydraulic Placement: up to 90,000 cys DirectTruck Pump Haul:-out: 20 cys1,000 to cys5,000 to cys30,000 cys

Hopper Town-wide Dredge/Disposal Strategy

Mechanical

Harwich Chatham

Sediment Deficit

MiIl Creek Inlet

Nantucket Sound Taylor’s Pond

Mill Creek Inlet

Little to no natural sand by-passing

1979 Issues • Poor flushing/water quality • East jetty “flanking” • Navigation impacts Taylor’s Pond • Shellfish habitat impacts • Abandonment of propagation beds

Mill Creek Inlet Jetty “fillet” filled to full entrapment

Oct 2009 Mill Creek Dredging & Sand Management Program Updrift Primary purpose- Ecosystem restoration Nourishment (Back-passing) Secondary purpose- Navigation Shorebird Nesting Habitat Mill Creek Jetty “Fillet” Reduction

Deposition Basin (-5 ft. MLW) Inlet Dredging (-4 ft. MLW)

Downdrift Nourishment (By-passing) Spring 2010

InletDowndrift DredgingBarnstable Nourishment Since County April Dredge 2010 Date QTY Disposal Apr 2010 14,000 cys By-Pass Nov 2010 4,500 cys By-Pass Nov 2011 3,000 cys Back-Pass Apr 2012 2,000 cys By-Pass Oct 2012 4,000 cys Back-Pass Nov 2013 3,500 cys By-Pass Feb 2015 7,500 cys By-Pass Total 38,500 cys

March 2010 Public/Private Partnership

Mill Creek Fillet Reduction

Town Support: • Reduce inlet shoaling • Sand back-passing • Privately funded $$

Beach Disposal

Chatham Red River Harwich Updrift Fillet Reduction • Target volume: 10,000 - 12,000 cys

Booster Pump

Dredge

Mar 25, 2015 Mill Creek Booster Dredge

Approx. 6,000 ft.

Public beach 930 cys Apr 2015

Private beaches 9,800 cys

Red River

Mar 2015 Jun 2015

Thank You 4TH ANNUAL CAPE COASTAL CONFERENCE

Putting Regional Sediment Management into Action: Dealing with Natural, Political and Municipal Boundaries

Moderators: Mark Borrelli: Center for Coastal Studies Tonna-Marie Rogers: Dept of Conservation/Recreation

Panel: John Ramsey: Applied Coastal Research and Engineering Brad Washburn: MA Office of Coastal Zone Management Ted Keon: Town of Chatham Heather McElroy: Cape Cod Commission