Daniel Wachenfeld / Triggerfish Images MS/AL Living Shoreline Workshop 2010 Jeff DeQuattro jdequattro@tnc.org March 17,
Living Shoreline Restoration Graphic Credit: Mobile Press Register
Living Shoreline Restoration Sparse biotic community Eroding shoreline Goals for TNC Breakwater Project Oyster bar foundation Shoreline stabilized Seagrass colonization? Some small fish and invertebrates Large oyster reef Expanded emergent marsh Expanded seagrass? Small and Large fish and invertebrates Reef Construction, Shoreline Stabilization, Marsh Re-growth, Faunal Utilization, and Seagrass Colonization. Slide Credit: Jared McKee - DISL
Site Locations Site Locations Site 1: Bay Front Park to Heron Point Bridge, Mobile Bay; Mobile County, AL (30.344917N, -88.123355W) Site 2: Coffee Island, Portersville Bay; Mobile County, AL (30.338954N, -88.253860W) Bayou La Batre Portersville Bay Site 2 Dauphin Island Sea Lab Mobile Site 1 Mobile Bay
Why did the shoreline need strengthening? Coffee Island Historical Erosion Aerial Photography (slide courtesy of Carl Ferraro)
Project Update - Bagged Oyster Shell Wayne Eldridge with J&W Marine Enterprises, Inc. Full Time Crew of about 8-10 people Magical Oyster Bagging Machine Creating approximately 140,000 bags of oyster shell.
Project Update - Reef Balls Reef Innovations, Inc. Larry Beggs President Robbie Duke Superintendant Harry Rolfe - Superintendant Crew of 6 people Creating 3,168 Reef Balls.
Project Update - ReefBLKs Coastal Environments, Inc. Mitch Tinsley Project Manager Crew of about 8 people. Creating 492 units to cover 750 linear meters of breakwater.
Alabama Port Treatment Layouts Alabama Port Treatment Material 1 Control 2 Shell Bags 3 ReefBLKs 4 Reef Balls 5 Reef Balls 6 Shell Bags 7 ReefBLKs 8 Control Treatments are labeled from North to South Each Treatment is 125m (~137 yd) in length Slide Credit: Jared McKee - DISL
Coffee Island Treatment Layouts Coffee Island Treatment Material 1 Control 2 Reef Balls 3 Shell Bags 4 ReefBLKs 5 ReefBLKs 6 Reef Balls 7 Control 8 Shell Bags Treatments are labeled from North to South Each Treatment is 125m (~137 yd) in length Slide Credit: Jared McKee - DISL
ReefBLK Layout Marsh Berm Beach 30m Distance from Shore - 30m Length - 125m Width ~ 2.64m Height ~ 0.61m 2.64m 125m Slide Credit: Jared McKee - DISL
ReefBLK Site Bathymetries Alabama Port 3 Coffee Island 4 0.4 0.4 0.2 0.2-0.2-0.4-0.6-0.8-0.2-0.4-0.6-1.2-0.8-1.4-1.6-1.8 10 20 30 40 50 60-1.2 10 20 30 40 50 60 70 Nov. 19 2009 Jan. 5 2010 Nov. 16 2009 Jan. 13 2010 Alabama Port 7 Coffee Island 5 0.2 0.2-0.2-0.2-0.4-0.6-0.8-0.4-0.6-0.8-1.2-1.4 10 20 30 40 50 60 70 Nov 19 2009 Jan 5 2010-1.2 10 20 30 40 50 60 70 Nov. 16 2009 Jan. 13 2010 Slide Credit: Jared McKee - DISL
Reef Ball Layout Marsh Berm Beach 30m Distance from Shore - 30m Length Distance - from 125mShore - 30m Width Length - - 2.28m 125m Width ~ 2.64m Height - 0.53m Height ~ 0.61m 2.28m 125m Slide Credit: Jared McKee - DISL Slide Credit: Jared McKee - DISL
Reef Ball Site Bathymetries Alabama Port 4 Coffee Island 2 0.2-0.2-0.4-0.2-0.6-0.8-0.4-0.6-1.2-1.4-1.6-0.8-1.8 10 20 30 40 50 60 70-1.2 10 20 30 40 50 60 70 Nov. 19 2009 Jan. 5 2010 Nov. 16 2009 Jan. 13 2010 Alabama Port 5 Coffee Island 6 0.2-0.2-0.2-0.4-0.6-0.8-1.2-0.4-0.6-0.8-1.4 10 20 30 40 50 60 Nov. 19 2009 Jan. 5 2010-1.2 10 20 30 40 50 60 70 Nov. 16 2009 Jan. 13 2010 Slide Credit: Jared McKee - DISL
Bagged Oyster Shell Layout Marsh Berm Beach 4m 30m Distance from Shore - 30m Total Length - 125m Width - 4m Height ~ 0.7m 10m 10m 10m 10m 17m 17m 17m 17m 17m Slide Credit: Jared McKee - DISL
Bagged Shell Site Bathymetries Alabama Port 2 Coffee Island 3 0.5 0.4 0.2-0.5-0.2-0.4-1.5-0.6-2.0-0.8-2.5 10 20 30 40 50 60 70 Nov. 19 2009 Jan. 5 2010 10 20 30 40 50 60 70 Nov. 16 2009 Jan. 13 2010 Alabama Port 6 Coffee Island 8 0.8 0.4 0.6 0.2 0.4 0.2-0.2-0.2-0.4-0.4-0.6-0.6-0.8-0.8-1.2 10 20 30 40 50 60 70 Nov. 19 2009 Jan. 5 2010-1.2 10 20 30 40 50 60 70 Nov. 16 2009 Jan. 13 2010 Slide Credit: Jared McKee - DISL
Geo-Grid Geo-Grid is being used to help prevent subsidence in the soft soils within the project area. Geo-Grid will be placed, staked, and weighted down just prior to deployment of various treatments
Monitoring Metrics 1. Oyster Abundance 2. Seagrass Cover 3. Finfish and Mobile Invertebrates 4. Sediment Size and Organic Content 5. Shoreline Stabilization 6. Marsh Plant Density
Socio-Economic Component Major Goal: To better understand the link between coastal residents and coastal resources 1) What are the biggest threats to coastal fisheries and habitats? 2) Which habitats and resources are the most important to protect and restore? 3) Where does an oyster have its greatest economic value? Slide Credit: Steven Scyphers- USA
Socio-Economic Survey Details Target Group: Method: Coastal Alabama Residents (n=1000) *Focus on Bayou la Batre, Alabama Random dial Telephone Survey Project Leadership: USA: Dr. Sean Powers Dr. Steve Picou Steven Scyphers (sscyphers@disl.org) UNF: Dr. Jeffrey Will Collaborators: NOAA: Dr. Peter Edwards TNC: Dr. Rob Brumbaugh Slide Credit: Steven Scyphers- USA
Q&A Questions? Comments?
Thank you! As I ate the oysters with their strong taste of the sea and their faint metallic taste that the cold white wine washed away, leaving only the sea taste and the succulent texture, and as I drank their cold liquid from each shell and washed it down with the crisp taste of the wine, I lost the empty feeling and began to be happy and to make plans. Ernest Hemingway, A Moveable Feast