KEYNOTE PRESENTATION FSBPA olsen

Transcription

1 AMELIA ISAND, FLORIDA BEACH MANAGEMENT PARTNERING AND PERSERVERENCE Erik Olsen, PE associates, inc. KEYNOTE PRESENTATION FSBPA 2009

2 IN ORDER TO ADDRESS SHORE PROTECTION TODAY LOCAL INTERESTS PARTNER WITH: FDEP FPS BB&CS US NAVY Nassau County Port Authority F.I.N.D. USACOE

3 LOCAL INTERESTS ON AMELIA ISLAND City of Fernandina Beach (Sponsor) Nassau County South Amelia Island Shore Stabilization Association Municipal Service Benefit Unit (MSBU)

4 YOU ARE HERE REGIONAL SETTING

5 Big & Little Talbot Island State Parks (3,600 acres) National Seashore Fort Clinch State Park (1224 acres) Amelia Island State Park (230 acres) PUBLICLY OWNED LANDS

6 Fort Clinch (1998) CONSTRUCTED IN 19 th CENTURY

7 FL et al. GA LIMITS OF NASSAU COUNTY SHOREFRONT

8 FL et al. GA FDEP DESIGNATED CRITICAL EROSION

9 Principal Sources of Long-Term Erosion-Navigation Impacts Stabilization of St. Mary s Entrance (1800 s) Stabilization of St. Johns River (1800 s)

10 St. Mary s Entrance Work began in 1881 N. Jetty (19,300 ft) S. Jetty (11,200 ft) 50 + MCY

11 Amelia Island Nassau Sound Little Talbot Island 1857 Location St. Johns River Entrance

12 Historical Shorelines 2001 Photo Amelia Island State Park

13 Amelia Island Historical Shorelines Atlantic Ocean A.I.S.P. Nassau Sound 2001 Photo

14 Island-wide Pre-Nourishment Historical Erosion Control Solutions Included: Groins (1900 s) Revetments (1965) Geotubes Dune Restoration tio Beach scraping (early 1970 s) Beach disposal

15 Fernandina Beach American Beach Revetments constructed by Federal Government after Hurricane Dora (1964)

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17 Proactive Shore Stabilization Soln. 1 St. Mary s Entrance Strategic Beach Disposal at N. Amelia Island (1974 Present)

18 St. Mary s Beach Disposal Source Federal Navigation Channel Maintenance Initiated in 1978, mol Has placed over 5 Mcy to date Disposal authorized island-wide: onshore and nearshore e Primary driving-force today is the Kings Bay, GA Naval Submarine Base

19 Memorandum of U.S. Navy / USACOE Understanding (MOU) St. Mary s Entrance Trident Class /St State t of ffl Florida Beach Disposal of all compatible material on Amelia Island No cost to State or Local Gov t Facilitated routinely since 1986 Further codified by Inlet Mgt Plan adopted in 1998

20 Proactive Partnering St. Mary s Entrance Protects Ft. Clinch (first priority) Enhance Fernandina Beach Note: Island-wide disposal is authorized by both MOU and Permit. Principal funding source U.S. Navy

21 Amelia Island Proactive Shore Stabilization Soln. 2 South Amelia Island Beach Restoration Program (Non-Federal)

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26 The Plan to Save South Amelia Island SAISSA, Inc. formed to address a chronic erosion problem along the South Island shoreline. Nassau County established the SAISS-MSBU to fund a project 1994 a 2.6Mcy, 18,000ft long beach restoration project was constructed. All funding was local. l

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29 First Renourishment In 2002, SAISSA and the Florida Park Service partnered to include the AISP in the first scheduled maintenance of the beach restoration project and to construct several stabilizing structures beneficial to both the Park and the renourishment project. This allowed for some State cost sharing.

30 Damage to AISP Maritime Forest High Tide TUBE High Tide

31 Amelia Island State Park

32 South Amelia Island Beach Restoration A.I.S.P SAISSA Project: 1.76 Mm 3 R-60 to R-78 (5,600 m) Designed and permitted in 18 months 2002 JOINT Project: 16Mm R-60 to R Photo A.I.S.P. Amelia Island State Park

33 Phase II Stabilization To introduce structural stabilization in order to reduce end losses from a 5.6 km (3.5 miles) updrift beach restoration project Nassau Sound Amelia Island A.I.S.P. Atlantic Ocean Beach Fill Phase I (2002) 2001 Photo

34 Phase II Stabilization to recapture State Park acreage lost to erosion Nassau Sound Amelia Island A.I.S.P. Atlantic Ocean Beach Fill Phase I (2002) 2001 Photo

35 Project Goal without adversely affecting the balance of sediment transport required to maintain the downdrift inlet facing shoreline of the state park. Nassau Sound Amelia Island AISP A.I.S.P. Atlantic Ocean 2001 Photo Terminal Structure?

36 Phase II Stabilization Design Precepts Reduce end losses from the beach fill project, Recapture eroded State Park lands, Protect endangered unique maritime forest, and Re-establish establish endangered species habitat.

37 Regional Environmental Protection Requirements* No impact to downdrift (inlet facing) shoreline * By Permit

38 Atlantic Ocean Nassau Sound

39 Regional Environmental Protection Requirements* No impact to downdrift (inlet facing) shoreline, No impact to Nassau Sound sediment budget, * By Permit

40 Regional Environmental Protection Requirements* No impact to downdrift (inlet facing) shoreline, No impact to Nassau Sound sediment budget, No impact to Bird Island Shoal Complex. * By Permit

41 Amelia Island Bird Island Shoals

42 Alternative Solutions A.) Beach fill alone not acceptable, B.) Radial Groin Field(s), C.) Terminal structure(s), D.) Breakwater(s),

43 Selected Plan 465 meter long leaky terminal structure, 93 meter long detached breakwater, Strategic updrift placement of advance beach fill to maximize impoundment effects.

44 Hinge Point A.I.S.P. Detached breakwater Concept 6 Leaky Terminal Structure Nassau Sound Atlantic Ocean Little Talbot Island 2001

45 Concept Plan (Pre-Beach Fill) Amelia Island State Park Privately Owned Lands Potential Acreage to be Recaptured 2001 Photo

46 2,253,000 R AP ,252,000 MHW (+3.2) 0.0 MLW (-2.1) R-75 Atlantic Ocean Predicted Pl f Planform AP-23 2,251,000 R-76 South Amelia Island November 2002 Northing (ft, NAD2 27) 2,250,000 R-82 Salient at Hinge Point AP-25 R-77 R R-81 2,249,000 Impounded Sh Shoreline li R-78 9 R-80 R-79.5 R R ,248, ,247,000 Spit 2,246,000 GRAPHIC SCALE Nassau Sound 359, , , , ,000 Easting (ft, NAD27) 364, ,000 FT 365,000

47 Anticipated Shoreline Response without Detached Breakwater AISP Anticipated Shoreline Response Existing Terminal Groin Detached Breakwater

48 Anticipated Shoreline Response without Detached Breakwater & with Groin Extension Existing Terminal Groin AISP 1,600 FT Anticipated Shoreline Response 750± ft Detached Breakwater

49 Sept. 2004

50 Evolving Spit Oct Permeable and Low Low Leaky Terminal Structure

51 * Hinge Point Salient Updrift detached breakwater (93 m) required to resolve historical hinge point in shoreline configuration. Low Tide Condition

52 COMPARISON July 2005

53 Breakwater Leaky Groin (buried) Spit Formation HISTORICAL SHORELINES August 2006

54 Amelia Island Proactive Shore Stabilization Soln. 3 Nassau County Shore Protection Project (Fernandina Beach)

55 (National Seashore) Shore Protection Project Location - State Park

56 Nassau County Shore Protection ti Project Federally Authorized Contractor Weeks Marine Constructed July to Sept, M cubic yards $15 million; mol

57 City of Fernandina Beach The Poster-Child of Perserverence 1946 Beach Erosion Board Study 1960 Study by Sav. District, C.O.E Recon Study by Jax C.O.E. * 1977 Feasibility Study by Jax C.O.E. (with Favorable Section Findings) 1984 Feasibility Study w/ E.I.S GRR (Revised 2004 & 2006) 2008 Construction at 62 YEARS LATER! * 9 years after Hurricane Dora (1964)

58 Cumberland Island Amelia Island St. Marys Entrance The Nassau County Shore Protection Project is one of a Relatively Small Number of Projects Nationally with a Section Component

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60 Section Mitigation First 50% of Project 100% Federal Second 50% of Project 58% Federal Result Total Federal Cost Average is 79%

61 Project completed in early Oct by Jacksonville District, USACOE

62 Amelia Island Proactive Shore Stabilization Soln. 4 Strategic Beach Disposal North Amelia Island St. Mary s Entrance Navigation Project South Amelia Island Atlantic Intracoastal Waterway (AIWW) Sponsor F.I.N.D.

63 AIWW Dredging Amelia Island Atlantic Ocean Nassau Sound AISP A.I.S.P. Oceanfront Beach Disposal Site 2001 Photo

64 THE END As it could have been

65 THE END As it is

66 QUESTIONS?