HomeMy WebLinkAbout2025-11-12 NHC Shoreline Mapping Program 2025 SummaryYear 12 – November 12, 2025
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: June 2024 – May 2025
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2024 - 2025)
Inlet Conditions (2024 - 2025)
Background Erosion Rates (2005/2006 - 2025)
Nourishment Triggers (2014 - 2025)
Q&A/Discussion
2
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: June 2024 – May 2025
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2024 - 2025)
Inlet Conditions (2024 - 2025)
Background Erosion Rates (2005/2006 - 2025)
Nourishment Triggers (2014 - 2025)
Q&A/Discussion
3
2025 Survey Dates:
Mason Inlet Relocation Project: April 2025 (GBA)
•14 Profiles (~500 and 1000 ft spacing)
Wrightsville Beach: May 7, 2025
•29 Profiles (~ 1000 ft spacing)
Masonboro Island: May 6, 2025
•22 Profiles (~ 2000 ft spacing)
Freeman Park: May 19-20, 2025
•10 Profiles (~ 1000 ft spacing)
Carolina Beach: May 19-20, 2025
•23 Profiles (~ 500 and 1000 ft spacing)
Kure Beach: May 19-20, 2025
•21 Profiles (~ 500 and 1000 ft spacing)
Fort Fisher: May 19-20, 2025
•19 Profiles (~ 1000 ft spacing)
4
Data Collection – Survey Transects
Survey Reach Landmarks:
5
Data Collection – Survey Transects
Sub-Reach (Profiles) Reach Length (ft) Start Point End Point
MIRP F8 - South (5-14) 9,500 Beach Road South Bridge Rd
MIRP F8 - Mason Inlet (1-4) 2,000 Mason Inlet Beach Rd South
Wrightsville Beach - North/Mason Inlet (1-7) 5,631 Mason Inlet Duneridge Condos
Wrightsville Beach - Central (8-17) 9,923 Duneridge Condos Trailborn Surf & Sound
Wrightsville Beach - South (18-24) 6,149 Trailborn Surf & Sound North Jetty
Wrightsville Beach - Masonboro Inlet (25-29) 2,925 North Jetty Masonboro Inlet (radial transects)
Masonboro Island - North (1-6) 10,002 South Jetty Quarter of Island
Masonboro Island - Central (7-12) 11,653 Quarter of Island Half of Island
Masonboro Island - South (13-22) 17,638 Half of Island Carolina Beach Inlet
Freeman Park - Carolina Beach Inlet (1-4) 3,110 Carolina Beach Inlet Carolina Beach Inlet (radial transects)
Freeman Park (5-10) 5,510 Carolina Beach Inlet Freeman Park
Carolina Beach - North (1-5) 2,838 Freeman Park Rock Revetment (Periwinkle Lane)
Carolina Beach - Central (6-16) 8,248 Rock Revetment (Periwinkle Lane) Courtyard Carolina Beach Hotel
Carolina Beach - South (17-23) 7,003 Courtyard Carolina Beach Hotel Atlantic Towers
Kure Beach - North (1-6) 6,017 Atlantic Towers Kure Beach Fishing Pier
Kure Beach - Central (7-10) 3,731 Kure Beach Fishing Pier Davis Rd
Kure Beach - South (11-21) 5,594 Davis Rd Riggings Condos
Fort Fisher - North (1-4) 2,461 Riggings Condos Ft. Fisher Revetment
Fort Fisher - Central (5-13) 8,842 Ft. Fisher Revetment Half of Reach
Fort Fisher - South (14-19) 5,496 Half of Reach New Hanover/Brunswick Co. Line
FORT FISHER
MASON INLET RELOCATION PROJECT
WRIGHTSVILLE BEACH
MASONBORO ISLAND
FREEMAN PARK
CAROLINA BEACH
KURE BEACH
Survey Transects & Sub-Reaches
6
Data Collection – Survey Transects
7
Data Collection – Survey Transects
Survey Transects & Sub-Reaches
8
Data Collection – Survey Transects
Survey Transects & Sub-Reaches
9
Data Collection – Survey Transects
Survey Transects & Sub-Reaches
Survey Performed By Geodynamics
10
ATV – TOPO DATA
AQUISITION
RV ECHO – HYDRO
DATA AQUISITION
Data Collection – Survey Equipment
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: June 2024 – May 2025
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2024 - 2025)
Inlet Conditions (2024 - 2025)
Background Erosion Rates (2005/2006 - 2025)
Nourishment Triggers (2014 - 2025)
Q&A/Discussion
11
Presentation Outline
Mean High Water (MHW) = +1.4 ft NAVD88
Recreational Berm = +5.0 ft NAVD88
12
Project Methodology – Shoreline Change
Calculate Volume Above Multiple Elevations:
+1.4 ft NAVD88 – MHW
-4 ft NAVD88 – Wading Depth
-14 ft NAVD88 – Outer Bar
-20 ft NAVD88 – Depth Of Closure (Upper Bracket)
-30 ft NAVD88 – Depth Of Closure (Lower Bracket)
Use Volumes For:
Calculating Annual Volume Changes
Calculating/Updating Background Erosion Rates
13
Project Methodology – Volume Change
Volume Calculation Lenses
14
-40
-35
-30
-25
-20
-15
-10
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Distance From Baseline (ft)
Profile Volume Analysis - Profile Calculation Lenses
Foredune
(Landward Most
Dune Crest)
MHW
(+1.4 ft NAVD88)
(+4.4 ft MLLW)
Wading Depth
(-4 ft NAVD88)
(-1 ft MLLW)
Outer Bar
(-14 ft NAVD88)
(-11 ft MLLW)
-20 ft NAVD88
(-17 ft MLLW)
-30 ft NAVD88
(-27 ft MLLW)
Subaerial Beach
(Top of Dune to
MHW=+1.4 ft NAVD88)
Wading Depth
(MHW to -4 ft NAVD88)
Outer Bar
(-4 ft NAVD88 to -14 ft NAVD88)
Offshore
(-14 ft NAVD88 to -20 ft NAVD88)
Offshore
(-20 ft NAVD88 to -30 ft NAVD88)
Example
Volume
Above -14 ft
NAVD88
Project Methodology – Volume Change
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: June 2024 – May 2025
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2024 - 2025)
Inlet Conditions (2024 - 2025)
Background Erosion Rates (2005/2006 - 2025)
Nourishment Triggers (2014 - 2025)
Q&A/Discussion
15
Presentation Outline
Spring 2024 to Fall 2024 -
Fairly Calm
Calm Summer - 2 Events
With Elevated Offshore
Wave Heights Just Over
2m (6.56 ft)
Hurricane Debbie, PTC
8, Hurricane Helene
Winter 2024 to Spring
2025 – Fairly Active
9 Events With Elevated
Offshore Wave Heights
Just Over 2m (6.56 ft)
1 Event With Elevated
Offshore Wave Heights
Just Under 3m (9.84 ft)
16
Key Events 2024-2025: Storm Activity
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NDBC Station 41110 - Masonboro Inlet, ILM2, NC
May 1, 2024 - May 31, 2025
Average Wave Height: 3.1 ft
Potential Tropical
Cyclone Eight
Typical
Winter Storm
Event
Hurricane
Debbie Hurricane
Helene
17
Key Events 2024-2025: Maintenance Activity
No Maintenance Activity During the 2024 – 2025 Monitoring Period
REMINDER: Wrightsville Beach CSRM: January – March 2024
REMINDER: Mason Inlet Relocation Project: January –March 2024
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: June 2024 – May 2025
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2024 - 2025)
Inlet Conditions (2024 - 2025)
Background Erosion Rates (2005/2006 - 2025)
Nourishment Triggers (2014 - 2025)
Q&A/Discussion
18
Presentation Outline
Mason Inlet Relocation Project – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88): Average = -54.8 ft (Range = -265.7 ft – +35.6 ft)
Mean High Water (+1.4 ft NAVD88): Average = -35.1 ft (Range = -128.4 ft – +45.7 ft)
19
*Survey Data Provided by the
Mason Inlet Relocation Project
Summary of Findings
11,500 ft
Mason Inlet Relocation Project – Volume Changes (cy/ft)
Significant Erosion From Transects 1 to 10 Due To Equilibration of 2024 MIRP
Placement - Largest Losses Adjacent to Mason Inlet, Decreasing with Distance
Accretion Adjacent to Northern Placement Limit Due To Littoral Transport From
Project
20
*Survey Data Provided by the
Mason Inlet Relocation Project
Volume Change Above -14 ft NAVD88 = -23.8 cy/ft (-273,597cy)
Summary of Findings
11,500 ft
Mason Inlet Relocation Project – Volume Changes (cy/ft & cy)
Above +1.4 ft NAVD88 (MHW) = -4.0 cy/ft = -46,087 cy
Range = 18.7 cy/ft – 6.9cy/ft
Above -4.0 ft NAVD88 (Wading Depth) = -12.6 cy/ft = -144,917 cy
Range = -46.6 cy/ft – +10.0 cy/ft
Above -14.0 ft NAVD88 (Offshore Bar) = -23.8 cy/ft = -273,597 cy
Range = -102.3 cy/ft – +16.5 cy/ft
Above -20.0 ft NAVD88 (Closure) = -21.9 cy/ft = -251,324 cy
Range = -114.6 cy/ft – +22.0 cy/ft
Above -30 ft NAVD88 (Offshore) = -21.1 cy/ft = -242,360 cy
Range = -116.8 cy/ft – +19.3 cy/ft
Overall Volume Loss Along The MIRP: Volume Losses Above -14 ft NAVD88
Totaled -273,597 cy, Equating To 60% Of 2024 Placement (459,821 cy) Which Is
Higher Than Typical First Year Losses (≈30% – 40%). Losses Were Largest
Adjacent To Mason Inlet, Decreasing With Distance From The Inlet. Area
North Of The 2024 Placement Limits Experienced Minor Accretion.
21
Summary of Findings
Wrightsville Beach – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88): Average = -35.9 ft (Range = -123.0 ft – +30.1 ft)
Mean High Water (+1.4 ft NAVD88): Average = -31.5 ft (Range = -121.5 ft – +48.2 ft)
22
Summary of Findings
21,703 ft
Wrightsville Beach – Volume Changes (cy/ft)
Wrightsville Beach – Central Experienced Significant Volume Losses Due To
Equilibration Of The 2024 CSRM Project
Significant Volume Gains Adjacent To Mason Inlet & Minor Volume Gains Adjacent To
Masonboro Inlet
Volume Change Above -14 ft NAVD88 = -10.6 cy/ft (-229,474 cy)
23
21,703 ft
Summary of Findings
Above +1.4 ft NAVD88 (MHW) = -6.8 cy/ft = -147,225cy
Range = -23.1 cy/ft – +6.7 cy/ft
Above -4.0 ft NAVD88 (Wading Depth) = -10.9 cy/ft = -236,678 cy
Range = -41.7 cy/ft – +23.4 cy/ft
Above -14.0 ft NAVD88 (Offshore Bar) = -10.6 cy/ft = -229,474 cy
Range = -65.8 cy/ft – +129.7 cy/ft
Above -20.0 ft NAVD88 (Closure) = -9.2 cy/ft = -199,264 cy
Range = -64.5 cy/ft – +151.9 cy/ft
Above -30 ft NAVD88 (Offshore) = -7.6 cy/ft = -164,520 cy
Range = -62.1 cy/ft – +156.6 cy/ft
Overall Volume Loss Along Wrightsville Beach: Volume Losses Above -14 ft
NAVD88 Totaled -229,474 cy Along Wrightsville Beach Oceanfront With
Wrightsville Beach – Central Experiencing -332,625 cy Of Loss. Volume Losses
In The Project Area Equate to 32% of the 2024 Placement (1,036,807 cy). Some
Losses Were Captured in Wrightsville Beach - North and South (≈103,000 cy).
Wrightsville Beach – Volume Changes (cy/ft & cy)
24
Summary of Findings
20 yr Average
Background
Erosion Rate
=
-8.6 cy/ft/yr
(-187,544 cy/yr)
-50
-40
-30
-20
-10
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8001,0001,2001,4001,6001,8002,0002,2002,4002,600
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Wrightsville Beach Transect 27
2024 2025
Natural
Replenishment
of Borrow Area
(Approx. 196 cy/ft)
Wrightsville
Beach
Masonboro
Island
Wrightsville Beach (Masonboro Inlet) – Example Profile
Historical Borrow Source For The Wrightsville Beach CSRM Project
25
Summary of Findings
Wrightsville Beach (Masonboro Inlet) – Volume Change (cy)
Combination of Several Survey Components & Calculations
Masonboro Inlet - USACE Hydrographic Surveys
Wrightsville Beach Spit - Geodynamics Laser Scanner
Calculate Volume of the USACE Hydrographic Surveys &
Wrightsville Beach Laser Scanner Data Within the Permitted
Borrow Area, Above Authorized Depths (ranges from -20 ft MLLW
to -30 ft MLLW)
Filled in Data Gaps Between USACE Hydrographic Surveys &
Wrightsville Beach Laser Scanner Data by Interpolating a Surface
Filled in Small Data Gaps at Edges/Corners Using Adjacent Survey
Elevations
26
Summary of Findings
Wrightsville Beach (Masonboro Inlet) – Volume Change (cy)
Volume Change March 2024 – December 2024 = +140,978 cy (+187,970 cy/yr)
Volume Available (December 2024) = +403,465cy
27
Summary of Findings
Masonboro Island – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88): Average = -13.4 ft (Range = -151.7 ft – +22.4 ft)
Mean High Water (+1.4 ft NAVD88): Average = -0.4 ft (Range = -41.6 ft – +26.2 ft)
28
Summary of Findings
39,293 ft
Masonboro Island – Volume Changes (cy/ft)
Stability Along A Majority Of Masonboro Island With More Significant Erosion
Adjacent To Carolina Beach Inlet
29
Volume Change Above -14 ft NAVD88 = +0.7 cy/ft (+26,529 cy)
Summary of Findings
39,293 ft
Masonboro Island – Volume Changes (cy/ft & cy)
Above +1.4 ft NAVD88 (MHW) = -0.2 cy/ft = -9,296 cy
Range = -4.5 cy/ft – +8.8 cy/ft
Above -4.0 ft NAVD88 (Wading Depth) = +1.9 cy/ft = +76,400 cy
Range = -9.4 cy/ft – +26.3 cy/ft
Above -14.0 ft NAVD88 (Offshore Bar) = +0.7 cy/ft = +26,529 cy
Range = -46.7 cy/ft – +42.7 cy/ft
Above -20.0 ft NAVD88 (Closure) = -2.3 cy/ft = -92,283 cy
Range = -54.5 cy/ft – +28.9 cy/ft
Above -30 ft NAVD88 (Offshore) = -2.3 cy/ft = -89,198 cy
Range = -56.1 cy/ft – +29.7 cy/ft
Overall Volume Gain Along Masonboro Island: Minor Volume Gains Above -14
ft NAVD88 Totaled +26,529 cy Which Is Not Atypical Given The Small
Background Erosion Rate In This Area. Erosion Adjacent to Carolina Beach
Inlet Should Be Monitored Due To Changing Hydrodynamics Of The Inlet.
30
Summary of Findings
20 yr Average
Background
Erosion Rate
=
-1.8 cy/ft/yr
(-72,161 cy/yr)
Freeman Park (Carolina Beach Inlet)
Due To The Alignment Of The Transects Across Carolina Beach Inlet, Not All
Profiles Include A Dune, Berm, & Aerial Beachface; Therefore, Shoreline
Change & Volume Change Calculations Were Not Performed
31
Summary of Findings
-50
-40
-30
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-200 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600
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Freeman Park Transect 2
2024 2025
Freeman
Park
Masonboro
Island
Limited IDMMS
Natural
Replenishment
(Approx. 64 cy/ft)
Freeman Park (Carolina Beach Inlet) – Example Profile
32
Summary of Findings
Minor Accretion Within Historical Borrow Source For The Carolina
Beach CSRM Project, Significantly Less Than Previous Years
-50
-40
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-200 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600
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Freeman Park Transect 2
2018 2019 2020 2021 2022 2023 2024 2025
Freeman
Park Masonboro
Island
Freeman Park (Carolina Beach Inlet) – Example Profile
33
Summary of Findings
Historical Borrow Source For The Carolina Beach CSRM Project
-30
-20
-10
0
10
20
-200 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 2,800 3,000 3,200 3,400 3,600
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Distance From Baseline (ft)
Freeman Park Transect 3
2024 2025
Approx 100 ft
NorthwardMigration
of Channel Centerline
Freeman
Park
Freeman Park
Spit Adjustment
Freeman Park (Carolina Beach Inlet) – Example Profile
34
Summary of Findings
Freeman Park Spit Adjustment at Mouth of Inlet
Freeman Park (Carolina Beach Inlet) – Volume Change (cy)
35
Summary of Findings
Combination of Several Survey Components & Calculations
Carolina Beach Inlet - USACE Hydrographic Surveys
Freeman Park Spit - Geodynamics Laser Scanner
Calculate Volume of the USACE Hydrographic Surveys & Freeman
Park Spit Laser Scanner Data Within the Permitted Borrow Area,
Above Authorized Depth (-40 ft MLLW)
Filled in Data Gaps Between USACE Hydrographic Surveys &
Freeman Park Laser Scanner Data by Interpolating a Surface
Filled in Small Data Gaps at Edges/Corners Using Adjacent Survey
Elevations
Freeman Park (Carolina Beach Inlet) – Volume Change (cy)
Volume Change 2024 – 2025 = +25,610 cy
Volume Change 2019 – 2025 = +1,276,443 cy
Volume Available (May 2025) = +1,377,660 cy
36
Summary of Findings
Freeman Park – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88): Average = +5.9 ft (Range = -19.3 ft – +59.0 ft)
Mean High Water (+1.4 ft NAVD88): Average = +16.3 ft (Range = -39.5 ft – +25.3 ft)
37
Summary of Findings
5,510 ft
Freeman Park – Volume Changes (cy/ft)
Volume Losses Along Majority of Reach Above Most Elevations
Small Volume Gains Adjacent to Carolina Beach Inlet Due to Spit Growth
38
Volume Change Above -14 ft NAVD88 = -10.0 cy/ft (-54,947 cy)
Summary of Findings
5,510 ft
Freeman Park – Volume Changes (cy/ft & cy)
Above +1.4 ft NAVD88 (MHW) = +4.1 cy/ft = +22,605 cy
Range = -1.8 cy/ft – +16.0 cy/ft
Above -4.0 ft NAVD88 (Wading Depth) = -0.8 cy/ft = -4,313 cy
Range = -16.7 cy/ft – +19.8 cy/ft
Above -14.0 ft NAVD88 (Offshore Bar) = -10.0 cy/ft = -54,947 cy
Range = -42.6 cy/ft – +24.2 cy/ft
Above -20.0 ft NAVD88 (Closure) = -9.3 cy/ft = -51,470 cy
Range = -36.5 cy/ft – +12.7 cy/ft
Above -30 ft NAVD88 (Offshore) = -10.8 cy/ft = -56,938 cy
Range = -33.5 cy/ft – +9.3 cy/ft
Overall Volume Loss Along Freeman Park: Moderate Volume Loss Above -14 ft
NAVD88 Totaling -54,947 (-10.0) cy/ft. This Is Slightly Lower Than The Historical
Background Volume Changes. Losses Were Largest Further From The Inlet With
Small Volume Gains Adjacent To The Inlet Likely Due To Shoaling In The Absence
Of Recent Dredging. As A Note, Overall Minor Volume Gains Were Experienced
Above MHW.
39
Summary of Findings
19 yr Average
Background
Erosion Rate
=
-12.1 cy/ft/yr
(-66,871 cy/yr)
Carolina Beach – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88): Average = -8.5 ft (Range = -48.1 ft – +22.2 ft)
Mean High Water (+1.4 ft NAVD88): Average = -11.8 ft (Range = -54.9 ft – +16.1 ft)
40
Summary of Findings
18,089 ft
Carolina Beach – Volume Changes (cy/ft)
Carolina Beach – North & Central Experienced Moderate Volume Losses From Erosion
of the 2022 CSRM Project
Carolina Beach – South Was More Stable, Benefitting From Southerly Transport of
Project Material
41
Volume Change Above -14 ft NAVD88 = -6.6 cy/ft (-119,323 cy)
Summary of Findings
18,089 ft
Carolina Beach – Volume Changes (cy/ft & cy)
Above +1.4 ft NAVD88 (MHW) = -1.7 cy/ft = -31,444 cy
Range = -12.9 cy/ft – +5.1 cy/ft
Above -4.0 ft NAVD88 (Wading Depth) = -3.9 cy/ft = -71,289 cy
Range = -24.0 cy/ft – +6.4 cy/ft
Above -14.0 ft NAVD88 (Offshore Bar) = -6.6 cy/ft = -119,323 cy
Range = -32.7 cy/ft – +12.9 cy/ft
Above -20.0 ft NAVD88 (Closure) = -9.3 cy/ft = -168,707 cy
Range = -34.7 cy/ft – +11.5 cy/ft
Above -30 ft NAVD88 (Offshore) = -10.8 cy/ft = -194,876 cy
Range = -38.2 cy/ft – +12.2 cy/ft
Overall Volume Loss Along Carolina Beach: Volume Losses Above -14 ft NAVD88
Totaled -119,323 cy (-6.6 cy/ft) Which Is Equivalent to 11% of 2022 CSRM Material
Placement. This Is Lower Than The Previous Year, Which Is Expected, & Lower
Than The Background Erosion Rate. Total Losses Since The 2022 CSRM Project
Equate To -710,422 cy (≈63% of Project). Larger Volume Losses Above -20 ft
NAVD88 and -30 ft NAVD88 Indicate Transport of Material Out Of The Vicinity.
42
Summary of Findings
19 yr Average
Background
Erosion Rate
=
-15.9 cy/ft/yr
(-287,364 cy/yr)
Kure Beach – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88): Average = -4.5 ft (Range = -22.5 ft – +29.1 ft)
Mean High Water (+1.4 ft NAVD88): Average = -10.3 ft (Range = -30.0 ft – -29.8 ft)
43
Summary of Findings
15,342 ft
Kure Beach – Volume Changes (cy/ft)
Kure Beach Experienced Moderate Volume Losses From Erosion of the 2022 CSRM
Project
Losses Were Fairly Consistent In Magnitude Throughout The Reach
44
Volume Change Above -14 ft NAVD88 = -5.3 cy/ft (-82,055 cy)
Summary of Findings
15,342 ft
Kure Beach – Volume Changes (cy/ft & cy)
Above +1.4 ft NAVD88 (MHW) = -0.5 cy/ft = -7,650 cy
Range = -5.3 cy/ft – +7.1 cy/ft
Above -4.0 ft NAVD88 (Wading Depth) = -3.0 cy/ft = -46,331 cy
Range = -12.5 cy/ft – +11.6 cy/ft
Above -14.0 ft NAVD88 (Offshore Bar) = -5.3 cy/ft = -82,055 cy
Range = -19.5 cy/ft – +13.5 cy/ft
Above -20.0 ft NAVD88 (Closure) = -7.4 cy/ft = -113,295 cy
Range = -21.5 cy/ft – +19.7 cy/ft
Above -30 ft NAVD88 (Offshore) = -3.5 cy/ft = -54,197 cy
Range = -14.2 cy/ft – +14.8 cy/ft
Overall Volume Gain Losses Kure Beach: Volume Losses Above -14 ft NAVD88
Totaled -82,055 cy (-5.3 cy/ft) Which Is Equivalent to 11% of 2022 CSRM Material
Placement. This Is Lower Than The Previous Year, Which Is Expected, & Lower
Than The Background Erosion Rate. Total Losses Since The 2022 CSRM Project
Equate To -519,425 cy (≈67% of Project). Larger Volume Losses Above -20 ft
NAVD88 Indicate Transport of Material Out Of The Vicinity.
45
Summary of Findings
19 yr Average
Background
Erosion Rate
=
-9.0 cy/ft/yr
(-138,538 cy/yr)
Fort Fisher – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88): Average = +0.2 ft (Range = -15.8 ft – +23.5 ft)
Mean High Water (+1.4 ft NAVD88): Average = +3.4 ft (Range = -16.2 ft – +21.5 ft)
46
Summary of Findings
16,799 ft
Fort Fisher – Volume Changes (cy/ft)
Overall Stability Along The Reach, Only Minor Volume Losses Above -14 ft NAVD88
Significant Offshore Volume Gains At Southern End Of Reach
47
Volume Change Above -14 ft NAVD88 = -0.9 cy/ft (-14,971 cy)
Summary of Findings
16,799 ft
Fort Fisher – Volume Changes (cy/ft & cy)
Above +1.4 ft NAVD88 (MHW) = +2.2 cy/ft = +36,410 cy
Range = -3.4 cy/ft – +8.1 cy/ft
Above -4.0 ft NAVD88 (Wading Depth) = +2.2 cy/ft = +37,301 cy
Range = -8.8 cy/ft – +13.8 cy/ft
Above -14.0 ft NAVD88 (Offshore Bar) = -0.9 cy/ft = -14,971 cy
Range = -20.6 cy/ft – +22.9 cy/ft
Above -20.0 ft NAVD88 (Closure) = +3.8 cy/ft = +63,608 cy
Range = -16.8 cy/ft – +24.2 cy/ft
Above -30 ft NAVD88 (Offshore) = +24.6 cy/ft = +413,523 cy
Range = -1.7 cy/ft – +56.6 cy/ft
Overall Volume Loss Along Fort Fisher: Minor Volume Losses Above -14 ft NAVD88
Totaled -14,971 cy (-0.9 cy/ft), Contrary To The Average Background Volume
Change Rates of +2.2 cy/ft/yr (+36,631 cy). Minor Volume Gains Above MHW, -4
ft NAVD88, and -20 ft NAVD88 With Significant Volume Gains Experienced Above
-30 ft NAVD88 Due To Small Offset In Profile Elevation Over Flat Offshore Portion
Of Profile.
48
Summary of Findings
19 yr Average
Background
Erosion Rate
=
+2.2 cy/ft/yr
(+36,631 cy/yr)
Pleasure Island – Shoreline Position Changes (ft)
Recreational Berm (+5.0 ft NAVD88) = -3.4 ft
Mean High Water (+1.4 ft NAVD88) = -4.0 ft
49
Summary of Findings
Pleasure Island – Volume Changes (cy/ft)
Volume Change Above -14 ft NAVD88 = -4.9 cy/ft (-271,296 cy)
50
Summary of Findings
New Hanover County – Unit Volume Change (cy/ft)
51
Summary of Findings
UPDATE
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
MI
R
P
F
8
S
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h
MI
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P
F
8
M
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N
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Ku
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N
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Fo
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C
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Fo
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Av
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V
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C
h
a
n
g
e
(
c
y
/
f
t
)
Average Unit Volume Change by Elevation (2024 - 2025)
South North
Change Above +1.4
Change Above -4
Change Above -14
Change Above -20
Change Above -30
/M
a
s
o
n
I
n
l
e
t
Er
o
s
i
o
n
Ac
c
r
e
t
i
o
n
New Hanover County – Cumulative Volume Change (cy)
52
Summary of Findings
UPDATE
-500,000
-450,000
-400,000
-350,000
-300,000
-250,000
-200,000
-150,000
-100,000
-50,000
0
50,000
100,000
150,000
200,000
250,000
MI
R
P
F
8
S
o
u
t
h
MI
R
P
F
8
M
a
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B
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N
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Ku
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B
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l
Ku
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B
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Fo
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N
o
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Fo
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C
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t
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a
l
Fo
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t
F
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S
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Cu
m
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t
i
v
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V
o
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C
h
a
n
g
e
(
c
y
)
Cumulative Volume Change by Elevation (2024 - 2025)
South North
Change Above +1.4
Change Above -4
Change Above -14
Change Above -20
Change Above -30
No
r
t
h
/
M
a
s
o
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Er
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Ac
c
r
e
t
i
o
n
2024 vs. 2025
(Total Change)Transects Reach
Length
avg
shoreline
change @
+5 ft
NAVD88
avg
shoreline
change @
+1.4 ft
NAVD88
avg
volume
change
above
+1.4 ft
NAVD88
cumulative
volume
change
above +1.4
ft NAVD88
avg
volume
change
above -4 ft
NAVD88
cumulative
volume
change
above -4 ft
NAVD88
avg
volume
change
above -14
ft NAVD88
cumulative
volume
change
above -14 ft
NAVD88
avg
volume
change
above -20
ft NAVD88
cumulative
volume
change
above -20 ft
NAVD88
avg
volume
change
above -30
ft NAVD88
cumulative
volume
change
above -30 ft
NAVD88
Reach # ft ft
ft cy/ft cy cy/ft cy cy/ft cy cy/ft cy cy/ft cy
Mason Inlet
Relocation Project 1-14 11,500 -54.8 -35.1 -4.0 -46,087 -12.6 -144,917 -23.8 -273,597 -21.9 -251,324 -21.1 -242,360
Wrightsville Beach* 1-24 21,703 -35.9 -31.5 -6.8 -147,225 -10.9 -236,678 -10.6 -229,474 -9.2 -199,264 -7.6 -164,520
Masonboro Island 1-22 39,293 -13.4 -0.4 -0.2 -8,557 1.9 76,400 0.7 26,529 -2.3 -92,283 -2.3 -89,198
Freeman Park 5-10 5,510 5.9 16.3 4.1 22,605 -0.8 -4,313 -10.0 -54,947 -9.3 -51,470 -10.3 -56,938
Carolina Beach 1-23 18,089 -8.5 -11.8 -1.7 -31,444 -3.9 -71,289 -6.6 -119,323 -9.3 -168,707 -10.8 -194,876
Kure Beach 1-21 15,342 -4.5 -10.3 -0.5 -7,650 -3.0 -46,331 -5.3 -82,055 -7.4 -113,295 -3.5 -54,197
Fort Fisher 1-19 16,799 0.2 3.4 2.2 36,410 2.2 37,301 -0.9 -14,971 3.8 63,608 24.6 413,523
Overall Summary – Annual Volume Change
MIRP: Overall Volume Losses Significant Volume Losses Due To Equilibration Of The
MIRP, Equating to ≈60% of Project Placement. Some Losses Captured North Of Placement
Area.
Wrightsville Beach: Overall Volume Losses Significant Volume Losses In WB – Central
Due To Equilibration of 2024 CSRM Project, Equating to 32% of Project Placement. Some
Losses Captured in WB – North/Mason Inlet and Wrightsville Beach – South.
Masonboro Island: Overall Volume Gains Minor Volume Gains Above -14 ft NAVD88.
However, Minor Volume Losses Experienced Above Depth of Closure.
53
Summary of Findings
2024 vs. 2025
(Total Change)Transects Reach
Length
avg
shoreline
change @
+5 ft
NAVD88
avg
shoreline
change @
+1.4 ft
NAVD88
avg
volume
change
above
+1.4 ft
NAVD88
cumulative
volume
change
above +1.4
ft NAVD88
avg
volume
change
above -4 ft
NAVD88
cumulative
volume
change
above -4 ft
NAVD88
avg
volume
change
above -14
ft NAVD88
cumulative
volume
change
above -14 ft
NAVD88
avg
volume
change
above -20
ft NAVD88
cumulative
volume
change
above -20 ft
NAVD88
avg
volume
change
above -30
ft NAVD88
cumulative
volume
change
above -30 ft
NAVD88
Reach # ft ft
ft cy/ft cy cy/ft cy cy/ft cy cy/ft cy cy/ft cy
Mason Inlet
Relocation Project 1-14 11,500 -54.8 -35.1 -4.0 -46,087 -12.6 -144,917 -23.8 -273,597 -21.9 -251,324 -21.1 -242,360
Wrightsville Beach* 1-24 21,703 -35.9 -31.5 -6.8 -147,225 -10.9 -236,678 -10.6 -229,474 -9.2 -199,264 -7.6 -164,520
Masonboro Island 1-22 39,293 -13.4 -0.4 -0.2 -8,557 1.9 76,400 0.7 26,529 -2.3 -92,283 -2.3 -89,198
Freeman Park 5-10 5,510 5.9 16.3 4.1 22,605 -0.8 -4,313 -10.0 -54,947 -9.3 -51,470 -10.3 -56,938
Carolina Beach 1-23 18,089 -8.5 -11.8 -1.7 -31,444 -3.9 -71,289 -6.6 -119,323 -9.3 -168,707 -10.8 -194,876
Kure Beach 1-21 15,342 -4.5 -10.3 -0.5 -7,650 -3.0 -46,331 -5.3 -82,055 -7.4 -113,295 -3.5 -54,197
Fort Fisher 1-19 16,799 0.2 3.4 2.2 36,410 2.2 37,301 -0.9 -14,971 3.8 63,608 24.6 413,523
Overall Summary – Annual Volume Change
Freeman Park: Overall Volume Losses Moderate Volume Losses Above -14 ft NAVD88,
Continuing Out to Depth Of Closure
Carolina Beach: Overall Volume Losses Continued Erosion Of The 2022 CSRM Project With
Losses Equivalent To 11% Of Project Placement. Total Losses Since 2022 Equate To ≈63% Of
Placement.
Kure Beach: Overall Volume Losses Continued Erosion Of The 2022 CSRM Project With
Losses Equivalent To 11% Of Project Placement. Total Losses Since 2022 Equate To ≈67% Of
Placement.
Fort Fisher: Overall Volume Losses Minor Volume Losses Above -14, Significant Volume
Gains Above -30 ft NAVD88
54
Summary of Findings
Reach Length
(ft)
Volume
Placed (cy)
(2005/2006-
2025)
Volume
Change (cy)
(2005/2006-
2025)
Avergage
Annual
Erosion
(cy/yr)
Avergage
Annual
Erosion
Rate
(cy/ft/yr)
(w/
management )
Background
Erosion (cy)
(2005/2006-
2025)
Average
Annual
Background
Erosion
(cy/yr)
Average
Annual
Background
Erosion
Rate
(cy/ft/yr)
(w/o
management )
Wrightsville Beach-North/Mason Inlet 5,631 0 -116,390 -5,820 -1.0 -116,390 -5,820 -1.0
Wrightsville Beach-Central 9,923 3,689,524 271,195 13,560 1.4 -3,418,329 -170,916 -17.2
Wrightsville Beach-South 6,149 0 -216,155 -10,808 -1.8 -216,155 -10,808 -1.8
Wrightsville Beach 21,703 3,689,524 -61,349 -3,067 -0.1 -3,750,873 -187,544 -8.6
Masonboro Island-North 10,002 0 140,044 7,002 0.7 140,044 7,002 0.7
Masonboro Island-Central 11,653 582,207 -532,598 -26,630 -2.3 -1,114,805 -55,740 -4.8
Masonboro Island-South 17,638 174,778 -293,688 -14,684 -0.8 -468,466 -23,423 -1.3
Masonboro Island 39,293 756,985 -686,242 -34,312 -0.9 -1,443,227 -72,161 -1.8
Freeman Park (Oceanfront) 5,510 254,000 -1,016,554 -53,503 -9.7 -1,270,554 -66,871 -12.1
Carolina Beach-North 2,838 815,122 -85,417 -4,496 -1.6 -900,539 -47,397 -16.7
Carolina Beach-Central 8,248 3,706,747 289,038 15,213 1.8 -3,417,709 -179,879 -21.8
Carolina Beach-South 7,003 1,580,931 439,269 23,119 3.3 -1,141,662 -60,087 -8.6
Carolina Beach 18,089 6,102,800 642,890 33,836 1.9 -5,459,910 -287,364 -15.9
Kure Beach-North 6,017 1,001,562 199,436 10,497 1.7 -802,126 -42,217 -7.0
Kure Beach-Central 3,731 261,572 110,650 5,824 1.6 -150,922 -7,943 -2.1
Kure Beach- South 5,594 1,552,616 -126,549 -6,660 -1.2 -1,679,165 -88,377 -15.8
Kure Beach 15,342 2,815,749 183,536 9,660 0.6 -2,632,213 -138,538 -9.0
Fort Fisher-North 2,461 0 7,902 416 0.2 7,902 416 0.2
Fort Fisher-Central 8,842 0 519,839 27,360 3.1 519,839 27,360 3.1
Fort Fisher-South 5,496 0 168,257 8,856 1.6 168,257 8,856 1.6
Fort Fisher 16,799 0 695,998 36,631 2.2 695,998 36,631 2.2
Total 116,736 13,619,058 -241,721 -10,755 -0.1 -13,860,779 -715,846 -6.1
Background Erosion Rate
Calculate Volume Change Above -14.0 ft NAVD88 From 2005/2006 - 2025
Subtract Out Placement Volumes From 2005/2006 – 2025
Annualized Background Erosion Rate = -6.1 cy/ft/yr for NHC
55
Summary of Findings
CSRM Projects Are
Essential For
Maintaining Beaches
Target is 0
Volume Losses =
Volume Placement
Nourishment Triggers
Proactive Approach to Start the Process of Planning for and Optimizing
Future Nourishments Projects if Federal Funds were to ever NOT come to
Fruition.
The Concept Of Nourishment Triggers Aims to Provide Equal Protection to all
Parts of the Beach
Modeled Cross-Shore Transport for Various Return Period Storms (i.e. 2-yr,
5-yr, 10-yr, 25-yr, 50-yr, & 100-yr) Using SBEACH
Determined the Existing “Level of Protection” for the Beach
What is the Largest Return Period Storm the Beach can Withstand?
Determine Design Level of Protection
What Level Storm do we want to Ensure Protection Against for the Entire
Beach?
Developed Nourishment Triggers Based on Design Level of Protection
Volume of Sand Required from the First Row of Structures out to -14 ft NAVD88
to Protect Against the Design Level of Protection
56
Summary of Findings
Nourishment Triggers
Wrightsville Beach – Existing Level of Protection
57
Summary of Findings
Representative
Transect Shoreline Reach 10-yr Trigger
Volume (cy/ft)
Average Trigger
Volume (cy/ft)
WB-04 Wrightsville Beach -
North/Mason Inlet 390 390
WB-09 286
WB-11 311
WB-14 295
WB-16 278
WB-20 Wrightsville Beach -
South 347 347
Wrightsville Beach -
Central 294
Wrightsville Beach – Design 10 YR Level of Protection
Representative
Transect
Existing Conditions
Level of Protection
WB-04 50-yr
WB-09 5-yr
WB-11 25-yr
WB-14 2-yr
WB-16 10-yr
WB-20 25-yr
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
480
500
520
540
560
580
600
WB - North/Mason Inlet 1-7WB - Central 8-17WB - South 18-24
Vo
l
u
m
e
A
b
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e
-
1
4
f
t
N
A
V
D
8
8
(
c
y
/
f
t
)
WRIGHTSVILLE BEACH - NOURISHMENT TRIGGERS (10-Yr Level of Protection)
2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014
347 cy/ft
294 cy/ft
390 cy/ft
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Nourishment Triggers
Wrightsville Beach – Volume Status
58
Summary of Findings
Nourishment Triggers
Carolina Beach – Existing Level of Protection
59
Summary of Findings
Carolina Beach – Design 25 YR Level of Protection
Representative
Transect
Existing Conditions
Level of Protection
CB-05 25
CB-07 25
CB-11 25
CB-14 50
CB-19 100
CB-21 50
CB-22 25
Representative
Transect Shoreline Reach 25-yr Trigger
Volume (cy/ft)
Weighted Trigger
Volume (cy/ft)
CB-05 Carolina Beach – North NA NA
CB-07 293 293
CB-11 345
CB-14 314
CB-19 276
CB-21 263
CB-22 297
Carolina Beach - Central
Carolina Beach - South
331
278
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
480
CB - North 1-5CB - Central 6-8CB - Central 9-16CB - South 17-23
Vo
l
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e
A
b
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-
1
4
f
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8
8
(
c
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)
CAROLINA BEACH - NOURISHMENT TRIGGERS (25-Yr Level of Protection)
2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014
278 cy/ft
331 cy/ft
293 cy/ft
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Nourishment Triggers
Carolina Beach – Volume Status
60
Summary of Findings
Nourishment Triggers
Kure Beach – Existing Level of Protection
61
Summary of Findings
Kure Beach – Design 25 YR Level of Protection
Representative
Transect
Existing Conditions
Level of Protection
KB-03 25-yr
KB-05 100-yr
KB-09 50-yr
KB-11 25-yr
KB-15 25-yr
KB-18 5-yr
KB-20 5-yr
Representative
Transect Shoreline Reach 25-yr Trigger
Volume (cy/ft)
Weighted Trigger
Volume (cy/ft)
KB-03 254
KB-05 270
KB-09 Kure Beach – Central 285 285
KB-11 305
KB-15 266
KB-18 NA NA
KB-20 NA NA
Kure Beach – North 260
Kure Beach – South
281
Nourishment Triggers
Kure Beach – Volume Status
62
Summary of Findings
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
420
KB - North 1-6KB - Central 7-10KB - South 11-17KB - South 18-21
Vo
l
u
m
e
A
b
o
v
e
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1
4
f
t
N
A
V
D
8
8
(
c
y
/
f
t
)
KURE BEACH - NOURISHMENT TRIGGERS (25-Yr Level of Protection)
2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014
281 cy/ft 285 cy/ft
260 cy/ft
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
Future Datasets Will Improve Analyses
Assessment Of Background Erosion Rates With Respect To Maintenance
Volumes And Cycles
Assessment Of Specific Sand Placement Locations And Volumes
Assessment of Beach Conditions With Respect to Nourishment Triggers
Establishment Of Long-Term Trends
Project Performance
Natural Erosion/Accretion Patterns
Determination Of Longshore Extent Of Inlet Influences
Refinement Of Hotspot & Nodal Point Locations
Assessment Of Borrow Area Volumes Throughout Nourishment Cycle
Annual Monitoring Works In Conjunction With Coastal Modeling
Provides Data For Model Calibration (Shorelines, Bathymetry, etc.)
Provides Current Conditions From Which To Assess Alternatives
63
Summary of Findings – Final Thoughts
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: June 2024 – May 2025
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2024 - 2025)
Inlet Conditions (2024 - 2025)
Background Erosion Rates (2005/2006 - 2025)
Nourishment Triggers (2014 - 2025)
Q&A/Discussion
64
Presentation Outline
65
Q&A / Discussion