Protecting the Lost Colony of Roanoke with Innovative Shoreline Stabilization Solutions

Transcription

1 Protecting the Lost Colony of Roanoke with Innovative Shoreline Stabilization Solutions Matthew Starr, PG Jeff Tabar, PE, D.CE Corbitt Kerr, PhD, PE February 8, 2018

2 Agenda 1 Lost Colony History 2 Project Background 3 Alternatives Analysis 4 Conceptual Design 5 Next Steps

3 1 Lost Colony History Captivating quote, stat, description, etc. that explains the new section.

4 The Lost Colony Images: Google Earth, 2018 Fort Raleigh National Historic Site

5 The Lost Colony Roanoke Colony, also known as the Lost Colony established in 1585 Roanoke Island Dare County, North Carolina Queen Elizabeth I attempt to establish a permanent settlement in North America Founded by Sir Walter Raleigh Colonists disappeared during the Anglo-Spanish War (c ) Sir Walter Raleigh "North Carolina History Project : Roanoke Island".

6 The Lost Colony Queen Elizabeth granted Raleigh a charter for colonization Raleigh was to discover, search, find out, and view such remote heathen and barbarous Lands, Countries, and territories... to have, hold, occupy, and enjoy In 1587, 118 English men, women, and children came ashore on Roanoke Island to establish a permanent English settlement in the New World "North Carolina History Project : Roanoke Island".

7 The Lost Colony In 1590, when English ships returned to bring supplies, they found the island deserted with no sign of the colonists No trace of the 90 men, 17 women, and 11 children, nor was there any sign of a struggle or battle The only clue was the word "CROATOAN" carved into a post of the fence around the village, and the letters C-R-O carved into a nearby tree. After nearly 450 years, the mystery of what happened to the colonists remains unsolved. "North Carolina History Project : Roanoke Island".

8 The Lost Colony Theories Integration with local tribes (Catawba and Coree) The Spanish destroyed the colony as they did at Fort Charles in coastal South Carolina Colonists relocated to another location Climate factors drought from 1587 to 1590 Climatologists used tree ring cores from 800yr old bald cypress "North Carolina History Project : Roanoke Island".

9 The Lost Colony Evidence In 1993, Hurricane Emily caused numerous relics to appear along the shoreline (pottery, utensils) East Carolina University began digging and found evidence the settlers lived with native people Extreme deficiency now in archaeological evidence due extreme shoreline erosion Rustic fort on north shore is documented Between 1851 and 1970, the northern shoreline eroded 928 feet due to erosion Current erosion rate 1 to 5 feet/year "North Carolina History Project : Roanoke Island".

10 Historic Shoreline Erosion

11 The Lost Colony Erosion If in the years leading up to and following the brief life of the settlement at Roanoke, shoreline erosion was following the same trend, it is likely that the site of the historic dwellings are underwater, along with any artifacts or signs of life America s Greatest Unsolved Mystery "North Carolina History Project : Roanoke Island".

12 2 Project Background Captivating quote, stat, description, etc. that explains the new section.

13 Project Background #1 priority of all NPS projects Project initiated by NPS SE District in 2017 Severe shoreline erosion due to hurricane activity, winter Noreasters, rising water levels and currents 4,400 feet of unstable shoreline Undercut cliffs 25 feet high

14 Project Background

15 Project Background

16 Project Background Wooden groins (1950s)

17 Project Background Wooden groins (1950s)

18 Project Background

19 Project Background

20 Project Background Granite riprap (1980s)

21 Project Background Granite riprap (1980s)

22 Project Background Loss of vegetation

23 Project Background Groins and riprap

24 Project Background Beach/Groins/Riprap/Debris

25 Project Background Beach/Groins/Riprap/Debris

26 3 Alternatives Analysis Captivating quote, stat, description, etc. that explains the new section.

27 Alternatives Analysis Site analysis Historic reports and maps review

28 Alternatives Analysis Topographic and hydrographic survey

29 Alternatives Analysis Tides small amplitude (1-2 ) Winds large NW fetch (37 miles) Waves wind dominated (3-4 ) Shallow water depth

30 Alternatives Analysis Geotech to be completed by S&ME early March 2018 Geotechnical plan Archaeologists onsite Waterborne tracked rig

31 Alternatives Analysis Recreational Enhancement Ecological Enhancement (Living Shoreline) Educational Outreach Opportunties Maintenance Requirements Preferred Design Shore Protection Resiliency Value

32 Alternatives Analysis Alternative 1A Living Shoreline with Rock Breakwater Alternative 1B Living Shoreline with Vinyl Sheet Pile Breakwater Alternative 1C Living Shoreline with Concrete Breakwater Alternative 2 Rock Revetment Alternative 3 Beach Fill and Dune Creation

33 4 Conceptual Design Captivating quote, stat, description, etc. that explains the new section.

34 Conceptual Design Alternative 1A Living Shoreline with Rock Breakwater

35 Conceptual Design Alternative 1A Living Shoreline with Rock Breakwater

36 Conceptual Design Alternative 1A Living Shoreline with Rock Breakwater

37 Conceptual Design Alternative 1B Living Shoreline with Vinyl Sheet Pile Breakwater

38 Conceptual Design Alternative 1C Living Shoreline with Concrete Breakwater

39 Conceptual Design Alternative 2 Rock Revetment

40 Conceptual Design Alternative 2 Rock Revetment

41 Conceptual Design Alternative 2 Rock Revetment

42 Conceptual Design Alternative 3 Beach Fill and Dune Creation

43 Conceptual Design Alternative 3 Beach Fill and Dune Creation

44 Conceptual Design Alternative 3 Beach Fill and Dune Creation

45 5 Next Steps Captivating quote, stat, description, etc. that explains the new section.

46 Decision Matrix Alternative 1A 1B 1C 2 1 and 2 Combo 3 4 Living Shoreline and Rock Breakwater Living Shoreline and Vinyl Sheet Pile Breakwater Living Shoreline and Concrete Breakwater Rock Revetment Living Shore, Breakwater and Rock Revetment Beach Fill and Dune Creation No Action Project Considerations Shoreline Protection Better Better Better Best Better Good Poor Maintain or Improve Condition of Resource Best Best Best Good Better Better Poor Improve Visitor Enjoyment through Better Service and Educational and Recreational Opportunities Best Best Best Good Good Better Poor Improve Operations Efficiency, Sustainability, and Maintenance Better Better Better Best Better Good Poor Provide Environmentally Responsible (Resilient), and Otherwise Beneficial Development Best Best Best Good Better Good Poor

47 Next Steps Value Analysis Workshop on 2/28 at Fort Raleigh, NC NPS will rank alternatives NPS will choose preferred option Geotech collection 35% Schematic Design

48 Questions? Matthew Starr, PG - SE Coastal Team Leader 5801 Pelican Bay Boulevard Suite 300, Naples FL Matthew.Starr@stantec.com