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R: 96
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R: 241
G: 95
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R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Erosion Mitigation And Shoreline
Management Feasibility Study
Town of Duck, North Carolina
Coastal Planning & Engineering of North Carolina
August 15, 2012
Tom Jarrett
Robert Neal
Ken Willson
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Outline:
• Review Goals of Study
• Phase 1 – Coastal Process/Erosion Impacts
• Phase 2 – Concepts/Cost/Timeline
• Results of Phase 1
• Shoreline Change Rates
• Trends/Reversals
• Pier Impacts
• Erosion Economics
• Phase 2 Concepts
• Develop an erosion mitigation strategy to address
this “Hot Spot”
• Develop a long term shoreline management
strategy for the entire Town
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R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Goals of the Study
• Evaluate shoreline changes along entire town
• Investigate the cause, extent, and severity of the chronic
erosion area or “Hot Spot” just north of the Research Pier
• Develop an erosion mitigation strategy to address this “Hot
Spot”
• Develop a long term shoreline management strategy for the
entire Town
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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OUR APPROACH
• Develop Comprehensive Understanding of Coastal
Processes
• Project Shoreline Change Rates (5, 10, 15, 30, and 50
Years)
• Develop Short-Term and Long-Term Management
Alternatives to Address Erosion
Determine Permitting Costs
Potential Sand Sources
Construction Costs
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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OUR APPROACH
• Develop Comprehensive Understanding of Coastal
Processes
• Project Shoreline Change Rates (5, 10, 15, 30, and 50
Years)
• Develop Short-Term and Long-Term Management
Alternatives to Address Erosion
Determine Permitting Costs
Potential Sand Sources
Construction Costs
PHASE 1
PHASE 2
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Phase 1: Coastal Process and
Shoreline Impact Analysis 1. Shoreline Change Rates
– What are the Shoreline Change Rates?
2. Trends or Reversals
– Should we expect past shoreline trends to remain constant or could
they reverse?
3. Pier Impacts
– Is the Pier impacting shoreline change rates?
4. Economic Losses Due to Shoreline Change Rates
– How much public and private property is threatened (Short-Term and
Long-Term)?
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R:0
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R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Phase 1: Coastal Process and
Shoreline Impact Analysis 1: Shoreline Change Rates
• 11 LiDAR data sets between 1996 and 2011.
• Analysis extends from 1 mile south of Town through 1
mile north of Town.
• 543 Transects established (100 ft. Spacing)
• Transects grouped into 10 segments with similar trends
between 1996 – 2011
• Analysis extended back to 1940 using USGS data
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R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Example of Shoreline Transects
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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-80
-60
-40
-20
0
20
40
Jun-96 Jun-98 Jun-00 Jun-02 Jun-04 Jun-06 Jun-08 Jun-10
Cu
mu
lati
ve C
han
ge (
ft)
Date of LiDAR survey
Cumulative Shoreline Change since 1996-South of the FRF Pier
Seg 1 (-22000 to -14000) Seg 2 (-14000 to -8000) Seg 3 (-8000 to -6000) Seg 4 (-6000 to -2000) Seg 5 (-2000 to 0)
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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-80
-60
-40
-20
0
20
40
Jun-96 Jun-98 Jun-00 Jun-02 Jun-04 Jun-06 Jun-08 Jun-10
Cu
mu
lati
ve C
han
ge (
ft)
Date of LiDAR survey
Cumulative Shoreline Change since 1996-North of the FRF Pier
Seg 6 (0 to 1000) Seg 7 (1000 to 6000) Seg 8 (6000 to 14000) Seg 9 (14000 to 16000) Seg 10 (16000 to 30000)
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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-150
-100
-50
0
50
100
150
Jan-40 Jan-50 Jan-60 Jan-70 Jan-80 Jan-90 Jan-00 Jan-10
Cu
mu
lati
ve C
han
ge (
ft)
Date of survey
Cumulative Shoreline Change South of FRF Pier Since 1940
Seg 1 Seg 2 Seg 3 Seg 4 Seg 5
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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-150
-100
-50
0
50
100
150
Jan-40 Jan-50 Jan-60 Jan-70 Jan-80 Jan-90 Jan-00 Jan-10
Cu
mu
lati
ve S
ho
relin
e C
han
ge (
ft)
Date
Cumulative Shoreline Changes North of FRF Pier Since 1940
Seg 6 Seg 7 Seg 8 Seg 9 Seg 10
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Shoreline Segment
Transect Grouping Distance From Pier (ft)
Average Shoreline Trend by Segment for 1996 to 2011
Overall Trend (ft/yr)
Total Movement (ft)
1 9 to 89 -22,000 to -14,000 0.67 10
2 89 to 149 -14,000 to -8,000 -0.37 -6
3 149 to 169 -8,000 to -6,000 1.81 27
4 169 to 209 -6,000 to -2,000 -1.04 -16
5 209 to 229 -2,000 to 0 -0.05 -1
6 229 to 239 0 to 1,000 -1.68 -25
7 239 to 289 1,000 to 6,000 -4.79 -73
8 289 to 369 6,000 to 14,000 1.1 17
9 369 to 389 14,000 to 16,000 -0.56 -8
10 389 to 529 16,000 to 30,000 1.53 23
Phase 1: Coastal Process and
Shoreline Impact Analysis 1: Shoreline Change Rates
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Dune Toe
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Comparison MHW Change to
Toe of Dune Change
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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• Reviewed Wave Data from FRF and other gauges.
• Possibility of Sand Wave Migration.
• Influence of shore oblique sand bars
Phase 1: Coastal Process and
Shoreline Impact Analysis 2: Trends and Reversals
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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R:0
G: 25
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R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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17.4 Meters / 57 Feet
FRF Pier
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Potential Monthly Sediment Transport Rates
Oct 1996 to Nov 2011 (Based on Gauge 3111)
-350,000
-250,000
-150,000
-50,000
50,000
150,000
250,000
350,000
Oct-96 Oct-98 Oct-00 Oct-02 Oct-04 Oct-06 Oct-08 Oct-10
Po
ten
tial
Mo
nth
ly A
lon
gsh
ore
Se
dim
en
t Tr
ansp
ort
(C
Y)
Date
Transport to South Transport to North
Dominate Littoral Transport to the North
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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• Net northward sediment transport
• No clear correlation between wave data and shoreline
change based on LiDAR data sets
• No significant differences in average storm conditions
when comparing 1996 – 1999 and 1999 – 2011.
• No major difference in storm conditions from 1980 to
1996 compared to other time period.
Phase 1: Coastal Process and
Shoreline Impact Analysis 2: Trends and Reversals
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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2: Shoreline Trends and Reversals
-10.0
-8.0
-6.0
-4.0
-2.0
0.0
2.0
4.0
6.0
8.0
10.0
10 110 210 310 410 510
Rat
e (
ft/y
r)
Transect
1940 to 1980 1980 to 1996 1996 to 2011
Southern Town Limit FRF Pier Northern Town Limit
1 2 3 4 5 6 7 8 9 10
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
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Phase 1: Coastal Process and
Shoreline Impact Analysis 3: Pier Impacts
• Analytical method to independently evaluate cross-shore
(EVEN) and alongshore (ODD) shoreline changes due to
potential obstruction.
• Cross-shore influences (storms) should impact the shoreline
about the same up-coast and down-cost of pier, hence EVEN
influence.
• Pier could potentially influence alongshore sediment transport
and cause unequal impacts up-coast and down-coast, hence
ODD influence.
• Cross-shore plus alongshore equals total shoreline response.
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Even Odd Analysis
1998 - 2008
Limit of Long-
Shore Influence
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Mean Sea Level
Mean Sea Level
Mean High Water
Phase 1: Coastal Process and
Shoreline Impact Analysis 4: Economic Losses Due To Shoreline Change Rates
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Mean Sea Level
Mean Sea Level
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40 ft.
Erosion Rate of 5 ft./ Year
Phase 1: Coastal Process and
Shoreline Impact Analysis 4: Economic Losses Due To Shoreline Change Rates
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Mean Sea Level
Mean Sea Level
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Erosion Rate of 5 ft./ Year
Apply 10 Years of Erosion
Phase 1: Coastal Process and
Shoreline Impact Analysis 4: Economic Losses Due To Shoreline Change Rates
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Mean Sea Level
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Erosion Rate of 5 ft./ Year
Apply 10 Years of Erosion
5 ft./yr. X 10 years = 50 ft.
Phase 1: Coastal Process and
Shoreline Impact Analysis 4: Economic Losses Due To Shoreline Change Rates
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Mean Sea Level
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Erosion Rate of 5 ft./ Year
Apply 10 Years of Erosion
5 ft./yr. X 10 years = 50 ft.
Phase 1: Coastal Process and
Shoreline Impact Analysis 4: Economic Losses Due To Shoreline Change Rates
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Phase 1: Coastal Process and
Shoreline Impact Analysis 4: Economic Losses Due To Shoreline Change Rates
• 1996 – 2011 shoreline change rates were applied to the
existing dune toe
• Developed predicted dune toe position for 5, 10, 15, 30,
and 50-year timeframes
• Parcel value reduced based on percentage lost
• Structure considered “total loss” when the predicted dune
toe intersected or became landward of the structure.
• Pools $50K deduction from structural value
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Predicted Dune Toe Positions
2016 2021 2026
2046 2066
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Years Cumulative
2011-2016 2016-2021 2021-2026 2026-2041 2041-2061
Area Lost (acres) 52.03 3.26 3.28 9.96 13.41 81.94
Parcels Lost (US Dollars)
$72,617,984 $6,164,873 $6,168,610 $18,526,114 $17,937,543 $121,415,125
Building Affected 0 7 16 10 8 41
Pools Affected 7 10 0 0 3 20
Lost Infrastructure (USD)
$350,000 $3,163,900 $13,168,650 $9,518,950 $1,026,600 $27,228,100
Phase 1: Coastal Process and
Shoreline Impact Analysis 4: Economic Losses Due To Shoreline Change Rates
Results from Phase 1
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Phase 2: Alternative Analysis
• What alternatives do we have that will mitigate erosion
damage to public and private property?
• What are the cost of implementing these alternatives?
• How long will it take to implement these alternatives?
• Considered economic value, innovative solutions, and
Town-wide benefits
Now That We Have Identified The Problem:
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• Develop a cost estimate for obtaining permits for the
project.
• Develop a schedule to obtain permits for the project
• Develop a cost and schedule associated with
Construction of the Project:
(Note: Town may want to consider continuing shoreline monitoring by FRF)
Phase 2: Alternative Analysis
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• No Action Alternative
• Erosion Mitigation Beach Fill Project
• Segmented Truck Haul Beach Fill
• Economic Impacts of Short Term vs. Long Term
Mitigation
Phase 2: Alternative Analysis
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Erosion Mitigation Beach Fill:
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Erosion Mitigation Beach Fill:
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Erosion Mitigation Beach Fill:
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Erosion Mitigation Beach Fill:
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Existing Geotechnical Information (Potential Borrow Sites)
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What About Impacts of Sea Level Rise?
= 1.35 ft/100 yrs
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Sea Level Rise
= 1.46 ft/100 yrs
Cumulative Nourishment Volume - Carolina Beach
0
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
14,000,000
16,000,000
18,000,000
Dec-64 Dec-69 Dec-74 Dec-79 Dec-84 Dec-89 Dec-94 Dec-99 Dec-04 Dec-09
Nourishment Dates
Cu
mu
lati
ve
Vo
lum
e (
cu
bic
ya
rds
)
Cumulative Nourishment Volumes Linear (Cumulative Nourishment Volumes)
12 Nourishment Operations Since
Initial Construction in 1964-65 Annual
Nourishment =~300,000 CY/YR
Funding Gap 1971 to 1981
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Segmented Beach Fill (Truck Haul):
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CONVEYOR
SYSTEM:
Images Provided By: Eastman Aggregates Inc.
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• Look at Scale of Cost
• Look at any permanent infrastructure that could
make one of these more cost efficient
• Sustainability
Comparison Between Long Term
Projects
Truck Haul vs. Dredging Projects
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Types of Beach Fill Projects:
• Mitigate Long-Term Erosion
• Storm Damage Reduction
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Storm Damage Reduction
Before Fran (After Bertha)
After Fran
USGS
USGS
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R:0
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R: 57
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B: 170
R: 248
G: 152
B: 29
R: 119
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B: 66
R: 96
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B: 66
R: 241
G: 95
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R: 0
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B: 257
R: 17
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B: 65
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Storm Damage Reduction
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
49
Dark Background Body Slide This background is best for on-screen presentations only—the background shows up best on-screen but uses
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Color Palette
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
PROFILE EVOLUTION OF BEACH NOURISHMENT
0 200 400 600 800 1000 1200 -200
DISTANCE
EL
EV
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ION
0
-10
-20
-30
10
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
PROFILE EVOLUTION OF BEACH NOURISHMENT
0 200 400 600 800 1000 1200 -200
DISTANCE
EL
EV
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ION
0
-10
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-30
10
Nourishment
Design Beach
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
PROFILE EVOLUTION OF BEACH NOURISHMENT
0 200 400 600 800 1000 1200 -200
DISTANCE
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EV
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0
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10
Design Beach
Advance Fill
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
PROFILE EVOLUTION OF BEACH NOURISHMENT
0 200 400 600 800 1000 1200 -200
DISTANCE
EL
EV
AT
ION
0
-10
-20
-30
10
Design Beach
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
PROFILE EVOLUTION OF BEACH NOURISHMENT
0 200 400 600 800 1000 1200 -200
DISTANCE
EL
EV
AT
ION
0
-10
-20
-30
10
Design Beach
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
PROFILE EVOLUTION OF BEACH NOURISHMENT
0 200 400 600 800 1000 1200 -200
DISTANCE
EL
EV
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0
-10
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10
Post-Construction
Adjustment in 1-3 years
Design Beach
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
56
Dark Background Body Slide This background is best for on-screen presentations only—the background shows up best on-screen but uses
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Color Palette
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R:0
G: 25
B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
57
Dark Background Body Slide This background is best for on-screen presentations only—the background shows up best on-screen but uses
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Approx. February 1993 Wet/Dry Line
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R:0
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B: 73
R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
58
Dark Background Body Slide This background is best for on-screen presentations only—the background shows up best on-screen but uses
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Approx. February 1993 Wet/Dry Line
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R:0
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R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
59
Dark Background Body Slide This background is best for on-screen presentations only—the background shows up best on-screen but uses
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Use Caution Make sure text/graphics do not
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Approx. February 1993 Wet/Dry Line
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R: 25
G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
60
Dark Background Body Slide This background is best for on-screen presentations only—the background shows up best on-screen but uses
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G:58
B:140
R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
61
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Storm Vulnerability
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R: 57
G: 104
B: 170
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G: 152
B: 29
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G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
62
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G:58
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R: 57
G: 104
B: 170
R: 248
G: 152
B: 29
R: 119
G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
63
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SBEACH
• Storm-induced BEAch CHange Model
• Simulates cross-shore erosion of the dune,
berm, and foreshore caused by storm waves
and water levels
85M
1020
06D
Omaha Beach FS18 (Sta. 450+47)
100 Year Return Interval Storm Thule St
85M
1020
06D
Omaha Beach FS18 (Sta. 450+47)
100 Year Return Interval Storm Thule St
85M
1020
06D
Omaha Beach FS18 (Sta. 450+47)
100 Year Return Interval Storm
Post-Storm Profile
Thule St
85M
1020
06D
Beach Fill: Alternative 1 & 3
Omaha Beach FS18 (Sta. 450+47)
100 Year Return Interval Storm Thule St
85M
1020
06D
Post-Storm Profile: Alternative 1 & 3
Omaha Beach FS18 (Sta. 450+47)
100 Year Return Interval Storm Thule St
85M
1020
06D
Post-Storm Profile: Alternative 1 & 3
Omaha Beach FS18 (Sta. 450+47)
100 Year Return Interval Storm Thule St
85M
1020
06D
Omaha Beach FS18 (Sta. 450+47)
100 Year Return Interval Storm
Post-Storm Profile
Thule St
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G:58
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R: 57
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B: 170
R: 248
G: 152
B: 29
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G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
71
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Summary
• Phase 1 analysis is generally complete, report being
prepared
• Concepts to be vetted for Phase 2 have been outlined
• Over the next 2 months we will finish Phase 2
• Recommend considering SBEACH analysis to
determine storm vulnerability for entire town
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R: 57
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B: 170
R: 248
G: 152
B: 29
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G: 160
B: 66
R: 96
G: 129
B: 66
R: 241
G: 95
B: 35
R: 0
G: 147
B: 257
R: 17
G: 82
B: 65
72
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Thank You For Your Time!!
Questions?
Tom Jarrett – [email protected]
Robert Neal – [email protected]
Ken Willson – [email protected]
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R: 57
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B: 170
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B: 29
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B: 66
R: 96
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B: 66
R: 241
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R: 0
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B: 257
R: 17
G: 82
B: 65
73
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