2018-12-12 Minutes
12 December 2018
Meeting Minutes
Chairman Barbour called the Port, Waterway & Beach Commission (PWBC) meeting to order at
~4:00. Participant introductions were made; attendance sheet is attached. The
November 2018 meeting minutes were approved.
Abbreviated Current Efforts
The US Army Corp of Engineers (USACE) Carolina Beach (CB) and Kure Beach (KB) Fiscal
Year (FY) 2019 Coastal Storm Damage Reduction (CSDR) Projects:
On 22 October, the USACE submitted a modified project information report (PIR)
delineating post- . The South Atlantic District approved the PIR
resulting in an additional $3.4 million Federal Flood Control Coastal Emergency (FCCE)
funds.
FCCE Federal Cost Share Non-federal Cost Share ~Totals
~CB $3.4M $3.1M $1.6M $8.1M
~KB $3.6M $4.0M $2.2M $9.8M
~Totals $7.0M $7.1M $3.8M $17.9M
On 30 November, the USACE awarded Weeks Marine the FY19 Pleasure Island contract
~$17.9M. A pre-construction meeting is anticipated shortly, inclusive of an initial
construction schedule.
Wrightsville Beach (WB) CSDR:
The USACE has initiated a post- PIR for WB. Estimated volume losses are
Mason Inlet Relocation Project (MIRP):
On 27 November, the USACE awarded the FY19 Atlantic Intracoastal Waterway
(AIWW) contract to Southwind Construction. At non-federal expense and as a contract
option, the Mason Creek Atlantic Intracoastal Waterway (AIWW) crossing is included in
the USACE scope of work. The contract bid for the Mason Creek crossing is
$440,000.00. A construction schedule is anticipated shortly.
Carolina Beach Inlet (CBI):
The USACE hopper dredge Currituck completed a seven-day, 12-hr/day maintenance
dredging event on 26 November. ~7800 cubic yards of inlet shoaled sand were removed
and managed in the nearshore dredge material management site.
As part of the ongoing vessel refurbishment, the USACE sidecast dredge Merritt is
anticipated back in service in mid to late January.
Recent surveys can be found at
http://saw-nav.usace.army.mil/INLETS/CAROLINA_BEACH/Carolina_Beach_Inlet.pdf.
Refined Coastal Modeling (RCM):
The CB RCM is undergoing FINAL editing and the DRAFT KB refined coastal
modeling is anticipated in the next two weeks.
WB CSDR Project, Post Authorization Change Report (PACR):
On 7 December, the USACE provided stakeholders a project status update. The PACR
st
remains within budget and a Chiefs Report deliverable remains in the 1 Quarter 2020.
source location, remains a significant challenge.
CB, Beach Renourishment Evaluation Report (BRER):
The USACE has tentatively scheduled a stakeholder project status update for January, a
firm date has yet to be determined. A similar CBRA challenge is anticipated.
Presentation: 2018 Shoreline Mapping Program Results by Moffatt & Nichol
Presented by Nicole VanderBeke, PE and Johnny Martin, PE. (pdf attached)
Public Comment:
Spencer R. inquired if the WB RCM included future shoreline predictions, specifically
reaches at and north of the former Moores Inlet (Holiday Inn Resort)? The ensuing
discussion included nodal zones, Mason Inlet management, continued data gathering and
anticipated shoreline attributes north of the CSDR template associated with the continued
equilibration of . Discussed the 2018 data demonstrating
atypical shoreline losses
the cove beach adjacent the revetment footprint.
Ken W. shared a potential shift in USACE strategies to make easier and quicker use of
locally permitted management authorizations
required use of an offshore inlet material disposal site when Federal dollars are employed
authorized and more efficient inshore site.
Ken W. shared a tentative USACE schedule of special purpose dredge plant maintenance,
ilitation starting March 2020
Chairman Barbour shared communications from the US Coast Guard and their attempt to
reestablish CB Inlet buoys 3, 4 and 5. Due to weather, a second effort will be scheduled.
HO, HO, HO!
Adjourn
PORT, WATERWAY & BEACH COMMISSION
ATTENDANCE
PWBC Members 12 Dec 2018 PWBC Associates 12 Dec 2018
Andrew, N. x Augustine, J.
Barbour, D. x Avery, N.
Bedsole, L. x Bloszinsky, C.
Coudriet, C. Bradbury, J.
Divoky, P. x Brothers, L. x
English, N. Bulluck, S. x
Flowers, K. Burgess, T.
Hundley, J. Caldwell, A.
Kellam, D. Dugan, J.
Kusek, P. Fetzer, T.
Lawler, P. Hufham, K.
McIntosh, G. Iannucci, J.
Mills, D. x Lambeth, C.
Oliver, A. x Newman, T.
Phillips, E. Owens, T.
Silivanch, N. Parvin, E.
Shuttleworth, S. Riley, K.
Walton, T. Rogers, S. x
Washington, G. Smith, K.
Wurtzbacher, L. Smith, R.
White, W.
Whitley, J.
Willson, K. x
Woodbury, P.
Young, A. x
Zapple, R.
Guests Affiliation Phone Number Email Address
December 12, 2018
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: March 2017 –April 2018
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2017 –2018)
Background Erosion Rates (2018)
Q&A/Discussion
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: March 2017 –April 2018
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2017 –2018)
Background Erosion Rates (2018)
Q&A/Discussion
Data Collection –Survey Transects
2018 Survey Dates:
Mason Inlet Relocation Project: May 2018 (GBA)
14 Profiles (~500 and 1000 ftspacing)
•
Wrightsville Beach: April 2 –3, 2018
29 Profiles (~ 1000 ftspacing)
•
MasonboroIsland: April 2 –3, 2018
22 Profiles (~ 2000 ftspacing)
•
Freeman Park: March 13 –14, 2018
10 Profiles (~ 1000 ftspacing)
•
Carolina Beach: March 13 –14, 2018
23 Profiles (~ 500 and 1000 ftspacing)
•
Kure Beach: March 13 –14, 2018
21 Profiles (~ 500 and 1000 ftspacing)
•
Fort Fisher: March 13 –14, 2018
19 Profiles (~1000 ftspacing)
•
Spring Surveys Serve As Pre-Storm Conditions
Data Collection –Survey Transects
Survey Reach Landmarks:
Sub-Reach (Profiles)Reach Length (ft)Start PointEnd Point
MIRP F8 - South (5-14)
9,500Beach Road SouthBridge Rd
MIRP F8 - Mason Inlet (1-4)
2,000Mason InletBeach Rd South
Wrightsville Beach - North/Mason Inlet (1-7)5,631Mason InletDuneridge Condos
Wrightsville Beach - Central (8-17)9,923Duneridge CondosBlockade Runner Beach Resort
Wrightsville Beach - South (18-24)6,149Blockade Runner Beach ResortNorth Jetty
Wrightsville Beach - Masonboro Inlet (25-29)2,558North JettyMasonboro Inlet (radial transects)
Masonboro Island - North (1-6)10,002South JettyQuarter of Island
Masonboro Island - Central (7-12)11,653Quarter of IslandHalf of Island
Masonboro Island - South (13-22)17,638Half of IslandCarolina Beach Inlet
Freeman Park - Carolina Beach Inlet (1-4)3,110Carolina Beach InletCarolina Beach Inlet (radial transects)
Freeman Park (5-10)5,510Carolina Beach InletFreeman Park
Carolina Beach - North (1-5)2,838Freeman ParkRock Revetment (Periwinkle Lane)
Carolina Beach - Central (6-16)8,248Rock Revetment (Periwinkle Lane)Courtyard Carolina Beach Hotel
Carolina Beach - South (17-23)7,003Courtyard Carolina Beach HotelAtlantic Towers
Kure Beach - North (1-6)6,017Atlantic TowersKure Beach Fishing Pier
Kure Beach - Central (7-10)3,731Kure Beach Fishing PierDavis Rd
Kure Beach - South (11-21)5,594Davis RdRiggings Condos
Fort Fisher - North (1-4)2,461Riggings CondosFt. Fisher Revetment
Fort Fisher - Central (5-13)8,842Ft. Fisher RevetmentHalf of Island
Fort Fisher - South (14-49)5,496Half of IslandNew Hanover/Brunswick Co. Line
Data Collection –Survey Transects
Survey Transects & Sub-Reaches
Data Collection –Survey Transects
Survey Transects & Sub-Reaches
Data Collection –Survey Transects
Survey Transects & Sub-Reaches
Data Collection –Survey Transects
Survey Transects & Sub-Reaches
Data Collection –Survey Equipment
Survey Performed By Geodynamics
ATV –TOPO DATA
AQUISITION
RV ECHO –HYDRO
DATA AQUISITION
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: March 2017 –April 2018
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2017 –2018)
Background Erosion Rates (2018)
Q&A/Discussion
Project Methodology –Shoreline Change
Mean High Water (MHW) = +1.4 ftNAVD88
Recreational Berm = +5.0 ftNAVD88
Carolina Beach Transect 10
20
DifferenceIn Position =
Shoreline Change @
15
Recreational Berm
10
Berm = +5.0 ft NAVD88
Berm = +5.0 ft NAVD88
5
MHW = +1.4 ft NAVD88MHW = +1.4 ft NAVD88
0
-5
DifferenceIn Position =
-10
Shoreline Change @
Mean High Water
-15
-20
-25
-100-500501001502002503003504004505005506006507007508008509009501,000
Distance Offshore (ft)
20172018
Project Methodology –Volume Change
Calculate Volume Above Multiple Elevations:
+1.4 ftNAVD88 –MHW
-4 ftNAVD88 –Wading Depth
-14 ftNAVD88 –Out Bar
-20 ftNAVD88 –Depth of Closure (Upper Bracket)
-30 ftNAVD88 –Depth of Closure (Lower Bracket)
Use Volumes For:
Calculating Annual Volume Changes
Calculating/Updating Background Erosion Rates
Project Methodology –Volume Change
Volume Calculation Lenses
Profile Volume Analysis -Profile Calculation Lenses
25
Foredune
20
(Landward Most
Dune Crest)
15
Subaerial Beach
(Top of Dune to
10
MHW=+1.4 ft NAVD88)
5
MHW
(+1.4 ft NAVD88)
(+4.4ft MLLW)
Wading Depth
0
(MHW to -4 ft NAVD88)
Wading Depth
-5
(-4 ft NAVD88)
Example
(-1 ft MLLW)
OuterBar
Volume
(-4 ft NAVD88 to -14ft NAVD88)
-10
Above -14 ft
Outer Bar
NAVD88
(-14 ft NAVD88)
(-11 ft MLLW)
-15
Offshore
(-14 ft NAVD88 to -20ft NAVD88)
-20 ft NAVD88
-20
(-17 ft MLLW)
Offshore
-25
(-20 ft NAVD88 to -30ft NAVD88)
-30 ft NAVD88
-30(-27 ft MLLW)
-35
-40
020040060080010001200140016001800200022002400260028003000
Distance From Baseline (ft)
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: March 2017 –April 2018
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2017 –2018)
Background Erosion Rates (2018)
Q&A/Discussion
Key Events 2017-2018 –Storm Activity
No Named Tropical Storms or Hurricanes That Impacted NHC
Several Spring 2017 and Winter/Spring 2018 Events With Elevated Wave
Heights (7 –8 ft)
Sta 41110 -Onslow Bay Outer
March 8,2017 -April 3, 2018
12
Unamed
AverageWave Height: 3.14 ft
StormEvent
11
10
Spring 2017
Events
9
Winter/Spring
2018Events
8
7
6
5
4
3
2
1
0
Key Events 2017-2018 –Maintenance Activity
Wrightsville Beach: February –March , 2018
Transects 8 –16/17: Approximately 763,000 cy
Borrow Area: Engineered Recycling Site Within MasonboroInlet
Carolina Beach CSDR Project: Spring 2016
Transects 1 –16 & Transects 22-23: Approximately 1,004,487 cy
Kure Beach CSDR Project: Spring 2016
Transects 1 –4& Transects 9-20: Approximately 540,744 cy
MIRP & Figure Eight Island Project: Winter 2016
Transects 4 –13 : Approximately 562,000 cy
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: March 2017 –April 2018
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2017 –2018)
0
Background Erosion Rates (2018)
Q&A/Discussion
Summary of Findings
Mason Inlet Relocation Project –Shoreline Elevation Changes (
Recreational Berm (+5.0 ftNAVD88): Average = -6.3 ft(
Range = -40.0 ft–+15.1
Mean High Water (+1.4 ftNAVD88): Average = -6.7 ft(
Range = -32.2 ft–+22.6 ft
11,500 ft
*Survey Data Provided by the
Mason Inlet Relocation Project
Summary of Findings
Mason Inlet Relocation Project –Volume Changes (cy/ft& cy)
Above +1.4 ftNAVD88 (MHW) = -0.2 cy/ft= -2,526 cy
Range = -11.4 cy/ft–+5.0 cy/ft
Above -4.0 ftNAVD88 (Wading Depth) = -3.3 cy/ft= -38,272 cy
Range = -18.5 cy/ft–+9.6 cy/ft
Above -14.0 ftNAVD88 (Offshore Bar) = -11.6 cy/ft= -133,517 cy
Range = -100.0 cy/ft–+29.0 cy/ft
Above -20.0 ftNAVD88 (Closure) = -14.6 cy/ft= -167,329 cy
Range = -113.3 cy/ft–+30.2 cy/ft
Above -30 ftNAVD88 (Offshore) = -15.7 cy/ft= -180,735 cy
Range = -114.3 cy/ft–+34.5 cy/ft
Overall Volume Loss Along the MIRP Survey Reach –Losses Above
NAVD88 Were Less Than The Previous Year Where They Totaled -301,059 cy
(2017) Due To Tropical Storm Hermine, Hurricane Matthew, & Equilibration of
2016 Beneficial Reuse Project
Summary of Findings
Mason Inlet Relocation Project –Volume Changes (cy/ft)
Erosion Fairly Consistent Throughout MIRP F8 –South With Erosion Increasing Slightly
As Distance from the Inlet Decreases
Large Offshore Losses in MIRP F8 –Mason Inlet Due to Deflation of Offshore Bar
11,500 ft
Volume Change Above -14 ftNAVD88 = -11.6 cy/ft(-
*Survey Data Provided by the
Mason Inlet Relocation Project
Summary of Findings
Wrightsville Beach –Shoreline Elevation Changes (ft)
Recreational Berm (+5.0 ftNAVD88): Average = +57.1 ft
(Range = -32.0 ft–+195.5
Mean High Water (+1.4 ftNAVD88): Average = +38.9 ft
(Range = -74.9 ft–+180.3
21,703 ft
-100
Wrightsville Beach -
Wrightsville Beach -Central
Wrightsville Beach -South
North/Mason Inlet
-80
-60
-40
-20
0
20
40
60
80
100
120
140
160
180
200
220+00200+00180+00160+00140+00120+00100+0080+0060+0040+0020+000+00
Station
Shoreline Change at MHW (+1.4 ft NAVD88)Shoreline Change at Berm Height (+5 ft NAVD88)
Summary of Findings
Wrightsville Beach –Volume Changes (cy/ft& cy)
Above +1.4 ftNAVD88 (MHW) = +10.8 cy/ft= +233,972 cy
Range = -9.3 cy/ft–+45.6 cy/ft
Above -4.0 ftNAVD88 (Wading Depth) = +18.8 cy/ft= +408,528 cy
Range = -16.1 cy/ft–72.7 cy/ft
Above -14.0 ftNAVD88 (Offshore Bar) = +26.3 cy/ft= +570,963 cy
Range = -36.7 cy/ft–+106.7 cy/ft
Above -20.0 ftNAVD88 (Closure) = +22.7 cy/ft= +493,435 cy
Range = -44.6 cy/ft–+104.7cy/ft
Above -30 ftNAVD88 (Offshore) = +15.2 cy/ft= +330,843 cy
Range = -49.7 cy/ft–+100.6 cy/ft
Overall Volume Gain Along the Wrightsville Beach Survey Reach –
Project Placed Approximately 763,000 cy (Wrightsville Beach –Central Volume
Gain Above -14 ftNAVD88 = +680,765 cy)
Summary of Findings
Wrightsville Beach –Volume Changes (cy/ft)
Wrightsville Beach –Central Experienced Volume Gains Due to the 2018 CSDR Project
Wrightsville Beach –South and Wrightsville Beach –North/Mason Inlet Experienced
Volume Losses
21,703 ft
-60
Volume Change Above -14 ftNAVD88 = +26.3 cy/ft(+570,963 cy)
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
Wrightsville Beach -
110
Wrightsville Beach -South
Wrightsville Beach -Central
North/Mason Inlet
120
220+00200+00180+00160+00140+00120+00100+0080+0060+0040+0020+000+00
Station
Volume Change Above MHWVolume Change Above -4 ftVolume Change Above -14 ft
Volume Change Above -20 ftVolume Change Above -30 ft
Summary of Findings
Wrightsville Beach (Masonboro Inlet) –Volume Change (cy/
Borrow Source For The Wrightsville Beach CSDR Project
Wrightsville Beach Transect 27
20
Wrightsville
Beach
10
Masonboro
0
Island
-10
-20
Dredging of
CSDRMaterial
-30
(Approx. 340 cy/ft)
-40
-50
2,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000
Distance From Baseline (ft)
20172018
Summary of Findings
Masonboro Island –Shoreline Elevation Changes (ft)
Recreational Berm (+5.0 ftNAVD88): Average = +2.1 ft
(Range = -93.7 ft–+33.5
Mean High Water (+1.4 ftNAVD88): Average = -11.2 ft
(Range = -116.4ft –+16.4
39,293 ft
Summary of Findings
Masonboro Island –Volume Changes (cy/ft& cy)
Above +1.4 ftNAVD88 (MHW) = -0.1 cy/ft= -5,104 cy
Range = -11.0 cy/ft–+4.7 cy/ft
Above -4.0 ftNAVD88 (Wading Depth) = -1.2 cy/ft= -45,507 cy
Range = -25.3 cy/ft–+8.9 cy/ft
Above -14.0 ftNAVD88 (Offshore Bar) = -3.5 cy/ft= -137,781 cy
Range = -90.9 cy/ft–+23.4 cy/ft
Above -20.0 ftNAVD88 (Closure) = -6.4 cy/ft= -251,108 cy
Range = -111.1 cy/ft–+21.2 cy/ft
Above -30 ftNAVD88 (Offshore) = -1.5 cy/ft= -57,030 cy
Range = -111.1 cy/ft–+29.6 cy/ft
Overall Volume Loss Along The MasonboroIsland Survey Reach –Losses
Above -14 ftNAVD88 Slightly Higher Than Current Background Erosion Rate of
-2.2 cy/ft
Summary of Findings
Masonboro Island –Volume Changes (cy/ft)
Masonboro Island –North Sub-Reach Experienced Minor Volume Gains
MasonboroIsland –Central & South Sub-Reaches Experienced Moderate Volume
Losses
Large Offshore Volume Loss At Transect 22, Adjacent to Carolina Beach Inlet
39,293 ft
Volume Change Above -14 ftNAVD88 = -3.5 cy/ft
Summary of Findings
Freeman Park (Carolina Beach Inlet) –Shoreline & Volume Change
Due To The Alignment Of The Transects Across Carolina Beach Inlet, Not All Profiles
Include A Dune, Berm, and Aerial Beachface; Therefore, Shoreline Change
Change Calculations Were Not Performed
Shoaling & Use Of The Inshore Dredge Material Management Site For CSDR Project
(Ex: Transect 2)
Summary of Findings
Freeman Park (Carolina Beach Inlet) –Shoreline & Volume Change
Freeman Park Transect 2
20
Masonboro
Freeman
10
Island
Park
0
-10
-20
-30
NaturalShoaling
& IDMMS Use
-40
(Approx. 325 cy/ft)
-50
-20002004006008001,0001,2001,4001,6001,8002,0002,2002,4002,600
Distance From Baseline (ft)
20172018
Summary of Findings
Freeman Park –Shoreline Elevation Changes (ft)
Recreational Berm (+5.0 ftNAVD88): Average = +20.2ft
(Range = -6.0 ft–+26.5
Mean High Water (+1.4 ftNAVD88): Average = -9.0 ft
(Range = -52.8 ft–+68.2 ft)
5,510 ft
Summary of Findings
Freeman Park –Volume Changes (cy/ft& cy)
Above +1.4 ftNAVD88 (MHW) = +3.3 cy/ft= +18,359 cy
Range = +1.6 cy/ft–+5.1 cy/ft
Above -4.0 ftNAVD88 (Wading Depth) = -0.8 cy/ft= -4,565 cy
Range = -6.8 cy/ft–+7.2 cy/ft
Above -14.0 ftNAVD88 (Offshore Bar) = -13.4 cy/ft= -74,016 cy
Range = -27.8 cy/ft–-2.6 cy/ft
Above -20.0 ftNAVD88 (Closure) = -14.4 cy/ft= -79,284 cy
Range = -42.1 cy/ft–+0.4 cy/ft
Above -30 ftNAVD88 (Offshore) = -15.2 cy/ft= -83,886 cy
Range = -52.7 cy/ft–+9.8 cy/ft
Overall Volume Loss Along The Freeman Park Survey Reach –Losses Above
-14 ftNAVD88 Slightly Higher Than Current Background Erosion Rate of
cy/ft
Summary of Findings
Freeman Park –Volume Changes (cy/ft)
Minor Volume Gain Experienced Above MHW
Significant Volume Losses Experienced Offshore –Likely Transported Into Carolina
Beach Inlet
Volume Change Above -14 ftNAVD88 = -13.4 cy/ft
5,510 ft
Summary of Findings
Carolina Beach –Shoreline Elevation Changes (ft)
Recreational Berm (+5.0 ftNAVD88): Average = -14.1 ft
(Range = -56.6 ft–+36.0
Mean High Water (+1.4 ftNAVD88): Average = -23.0 ft
(Range = -95.2 ft–+27.9
18,089 ft
Summary of Findings
Carolina Beach –Volume Changes (cy/ft& cy)
Above +1.4 ftNAVD88 (MHW) = -2.5 cy/ft= -44,515 cy
Range = -14.2 cy/ft–+6.4 cy/ft
Above -4.0 ftNAVD88 (Wading Depth) = -6.8 cy/ft= -123,474 cy
Range = -32.9 cy/ft–+9.9 cy/ft
Above -14.0 ftNAVD88 (Offshore Bar) = -15.0 cy/ft= -272,059 cy
Range = -49.6 cy/ft–+14.2 cy/ft
Above -20.0 ftNAVD88 (Closure) = -17.4 cy/ft= -315,000 cy
Range = -55.3 cy/ft–+13.9 cy/ft
Above -30 ftNAVD88 (Offshore) = -13.9 cy/ft= -251,817 cy
Range = -57.6 cy/ft–+15.9 cy/ft
Overall Volume Loss Along The Carolina Beach Survey Reach –Losses Above
-14 ftNAVD88 Less Than The Previous Year Where They Totaled -359,308 cy
(2017) Due To Tropical Storm Hermine, Hurricane Matthew, & Equilibration of
2016 CSDR Project
Summary of Findings
Carolina Beach –Volume Changes (cy/ft)
Carolina Beach –North & Central Sub-Reaches Experienced Significant Volume Losses
Consistent With Historical Trends (Approximately -262,741 cy)
Carolina Beach –South Sub-Reach Experienced Minor Volume Losses, Likely Abated by
Longshore Transport of CSDR Project Material
18,089 ft
Volume Change Above -14 ftNAVD88 = -15.0 cy/ft(-272,059 cy)
Summary of Findings
Kure Beach –Shoreline Elevation Changes (ft)
Recreational Berm (+5.0 ftNAVD88): Average = -15.5 ft
(Range = -50.5 ft–+23.3
Mean High Water (+1.4 ftNAVD88): Average = -16.9 ft
(Range = -50.3 ft–+35.1
15,342 ft
Summary of Findings
Kure Beach –Volume Changes (cy/ft& cy)
Above +1.4 ftNAVD88 (MHW) = -3.0 cy/ft= -46,424 cy
Range = -18.9 cy/ft–+4.6 cy/ft
Above -4.0 ftNAVD88 (Wading Depth) = -6.1 cy/ft= -93,679 cy
Range = -28.3 cy/ft–+5.2 cy/ft
Above -14.0 ftNAVD88 (Offshore Bar) = -7.9 cy/ft= -120,626 cy
Range = -36.5 cy/ft–+12.8 cy/ft
Above -20.0 ftNAVD88 (Closure) = -7.6 cy/ft= -116,886 cy
Range = -39.2 cy/ft–+13.4 cy/ft
Above -30 ftNAVD88 (Offshore) = -4.6 cy/ft= -70,161 cy
Range = -32.0 cy/ft–+19.5 cy/ft
Overall Volume Loss Along The Kure Beach Survey Reach –Losses Above
NAVD88 Less Than The Previous Year Where They Totaled -277,866 cy (2017)
Due To Tropical Storm Hermine, Hurricane Matthew, & Equilibration of 2016
CSDR Project
Summary of Findings
Kure Beach –Volume Changes (cy/ft)
Kure Beach –North & South Sub-Reaches Experienced Significant Volume Losses
Consistent With Historical Trends(Approximately -122,941 cy)
Kure Beach –Central Sub-Reach Experienced Minor Volume Gains, Likely Due to
Longshore Transport Of CSDR Project Material
15,342 ft
Volume Change Above -14 ftNAVD88 = -7.9 cy/ft
Summary of Findings
Fort Fisher –Shoreline Elevation Changes (ft)
Recreational Berm (+5.0 ftNAVD88): Average = -9.1 ft
(Range = -86.5 ft–+24.4 ft)
Mean High Water (+1.4 ftNAVD88): Average = -13.0 ft
(Range = -61.8 ft–+17.6
16,799 ft
Summary of Findings
Fort Fisher –Volume Changes (cy/ft& cy)
Above +1.4 ftNAVD88 (MHW) = -0.5 cy/ft= -7,812 cy
Range = -14.0 cy/ft–+8.5 cy/ft
Above -4.0 ftNAVD88 (Wading Depth) = -2.7 cy/ft= -45,251 cy
Range = -19.1 cy/ft–+11.4 cy/ft
Above -14.0 ftNAVD88 (Offshore Bar) = -5.1 cy/ft= -84,955 cy
Range = -39.7 cy/ft–+11.3 cy/ft
Above -20.0 ftNAVD88 (Closure) = -9.1 cy/ft= -153,157 cy
Range = -40.2 cy/ft–+13.6 cy/ft
Above -30 ftNAVD88 (Offshore) = -14.3 cy/ft= -240,661 cy
Range = -52.0 cy/ft–+10.4 cy/ft
Overall Volume Loss Along The Fort Fisher Survey Reach –Opposite of Typical
Historical Behavior, Possibly Due To Mean Wave Direction During Storm
Events And/OrLess Material Being Transported From Adjacent CSDR Project
Summary of Findings
Fort Fisher –Volume Changes (cy/ft)
Fort Fisher –North Sub-Reach Experienced Minor Volume Loss –Very Little Material In
System At This Location
Fort Fisher –Central & South Experienced Moderate Volume Losses –Not Typical
Behavior
16,799 ft
Volume Change Above -14 ftNAVD88 = -5.1 cy/ft(-84,955 cy)
Summary of Findings
Pleasure Island –Shoreline Elevation Changes (ft)
Recreational Berm (+5.0 ftNAVD88) =
Mean High Water (+1.4 ftNAVD88) =
Summary of Findings
Pleasure Island –Volume Changes (cy/ft)
Volume Change Above -14 ftNAVD88 = -9.9 cy/ft(-551,655 cy)
Summary of Findings
New Hanover County –Unit Volume Change (cy/ft)
Average Profile Volume Change by Elevation (2017 -2018)
70
South
65
Change Above +1.4
60
Change Above -4
55
ChangeAbove -14
50
Change Above -20
45
Change Above -30
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
Summary of Findings
New Hanover County –Cumulative Volume Change (cy)
Cumulative Volume Change by Elevation (2017 -2018)
700,000
South
650,000
Change Above +1.4
600,000
Change Above -4
550,000ChangeAbove -14
Change Above -20
500,000
Change Above -30
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
Summary of Findings
Background Erosion Rate
Calculate Volume Change Above -14.0’ NAVD88 From 2005/2006 -2018
Subtract Out Placement Volumes From 2005/2006 –2018
Annualized Background Erosion Rate = -5.8 cy/ft/yrfor NHC
Average
Avergage
Annual
Annual Average
Volume Volume Avergage Background Background
Erosion Annual
Length Placed (cy) Change (cy) Annual Erosion (cy) Erosion
ReachBackground
Rate
(ft)(2005/2006-(2005/2006-Erosion (2005/2006-Rate
(cy/ft/yr) Erosion
2018)2018)(cy/yr)2018)(cy/ft/yr)
((cy/yr)
w/
(
w/o
)
management
)
management
Wrightsville Beach-North/Mason Inlet5,6320-374,594-28,815-5.1-374,594-28,815-5.1
Wrightsville Beach-Central9,9222,494,717765,06958,8515.9-1,729,648-133,050-13.4
Wrightsville Beach-South6,1490-68,519-5,271-0.9-68,519-5,271-0.9
Wrightsville Beach
24,766
21,7032,494,717321,9561.1-2,172,761-167,135-7.7
Masonboro Island-North10,0020182,81114,0621.4182,81114,0621.4
Masonboro Island-Central11,653582,207-272,357-20,951-1.8-854,564-65,736-5.6
Masonboro Island-South
17,63883,793-365,319-28,101-1.6-449,112-34,547-2.0
Projects Are
-34,990
Masonboro Island39,293666,000-454,865-0.9-1,120,865-86,220-2.2
Essential For
-49,957
Freeman Park5,510254,000-599,482-9.1-853,482-71,123-12.9
Maintaining
Carolina Beach-North2,838555,34811,5349610.3-543,814-45,318-16.0
Carolina Beach-Central8,2482,482,227246,60220,5502.5-2,235,626-186,302-22.6
Carolina Beach-South
7,003674,968128,55710,7131.5-546,411-45,534-6.5
Carolina Beach
32,224
18,0893,712,543386,6921.8-3,325,851-277,154-15.3
Kure Beach-North6,017338,1201,049870.0-337,071-28,089-4.7
Kure Beach-Central3,73147,76834,3872,8660.8-13,381-1,115-0.3
Kure Beach- South
5,5941,028,636-97,262-8,105-1.4-1,125,898-93,825-16.8
Kure Beach
-5,152
15,3421,414,523-61,827-0.3-1,476,350-123,029-8.0
Fort Fisher-North2,461018,6511,5540.618,6511,5540.6
Fort Fisher-Central8,8420400,98033,4153.8400,98033,4153.8
Fort Fisher-South
5,4960122,04210,1701.9122,04210,1701.9
Fort Fisher
45,139
16,7990541,6732.7541,67345,1392.7
Total
12,031
116,7368,541,783134,1480.1-8,407,635-679,523-5.8
Summary of Findings –Overall Summary
Analysis Results -Volume Change (cy/ft)
MIRP: Volume Losses -Loss Rate Has Slowed 2 Years Post Construction
Wrightsville Beach: Volume Gains Due To 2018 CSDR Project
MasonboroIsland: Minor Volume Losses, Slightly Higher Than Average
Freeman Park: Moderate Volume Losses, Slightly Higher Than Average
Carolina Beach: Volume Losses -Loss Rate Has Slowed 2 Years Post Construction
Kure Beach: Volume Losses -Loss Rate Has Slowed 2 Years Post Construction
Fort Fisher: Moderate Volume Losses -Not Typical Behavior
avg
avg avg cumulative avg cumulative avg cumulative avg cumulative
volume
shoreline shoreline volume volume volume volume volume volume volume
2017 vs. 2018
Reach change
Transectschange @ change @ change change change change change change change
(Total Change)Lengthabove
+5 ft +1.4 ft above +1.4 above -4 ft above -4 ft above -14 above -14 ft above -20 above -20 ft above -30
+1.4 ft
NAVD88NAVD88ft NAVD88NAVD88NAVD88ft NAVD88NAVD88ft NAVD88NAVD88ft NAVD88
NAVD88
ftcy/ftcycy/ftcycy/ftcycy/ftcy
Reach#ftft
Mason Inlet
1-1411,500-6.3-6.7-0.2-2,526-3.3-38,272-11.6-133,517-14.6-167,329-15.7-180,735
Relocation Project
Wrightsville Beach1-2421,70357.138.910.8233,97218.8408,52826.3570,96322.7493,43515.2330,843
Masonboro Island1-2239,2932.1-11.2-0.1-5,104-1.2-45,507-3.5-137,781-6.4-251,108-1.5-57,030
Freeman Park5-105,51020.2-9.03.318,359-0.8-4,565-13.4-74,016-14.4-79,284-15.2-83,886
Carolina Beach1-2318,089-14.1-23.0-2.5-44,515-6.8-123,474-15.0-272,059-17.4-315,000-13.9-251,817
Kure Beach1-2115,342-15.5-16.9-3.0-46,424-6.1-93,679-7.9-120,626-7.6-116,886-4.6-70,161
Fort Fisher1-1916,799-9.1-13.0-0.5-7,812-2.7-45,251-5.1-84,955-9.1-153,157-14.3-240,661
Pleasure Island
(Freeman Park-Fort N/A55,740-9.6-17.0-1.4-80,392-4.8-266,969-9.9-551,655-11.9-664,327-11.6-646,525
Fisher)
Summary of Findings –Overall Summary
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
Establishment of Long-Term Trends
Project Performance
Natural Erosion/Accretion Patterns
Determination of Longshore Extent of Inlet Influences
Refinement of Hotspot & nodal Point Locations
Annual Monitoring Works In Conjunction With Coastal Modeling
Provides Data For Model Calibration (Shorelines, Bathymetry, etc.)
Provides Current Conditions From Which to Assess Alternatives
Presentation Outline
Data Collection
Survey Transects
Survey Equipment
Project Methodology
Shoreline Change
Volume Change
Key Events: March 2017 –April 2018
Storm Activity
Maintenance Activity
Summary of Findings
Shoreline & Volume Change (2017 –2018)
Background Erosion Rates (2018)
Q&A/Discussion
Q&A / Discussion
Agenda
12 December 2018, 4:00 PM
New Hanover County, Government Center
Finance Conference Room, 500
4:00 Call to Order
Welcome/Introductions
Request approval of the November meeting minutes (emailed 15 November 2018).
Presentation:2018 Shoreline Mapping Program Overview by Moffatt & Nichol (approx. 40 minutes)
Abbreviated Current Efforts:
Carolina Beach (CB) and Kure Beach (KB) Fiscal Year (FY) 2019 Coastal Storm Damage Reduction (CSDR) Project
Project awarded to Weeks Marine on 30 November, construction schedule pending.
Bid volumes were CB 964,000 cubic yards and KB 637,000 cubic yards.
An additional $3.4M in Federal Flood Control and Coastal Emergency (FCCE) funds were secured through
modified Project Information Reports (PIR).
Wrightsville Beach (WB) CSDR
An USACE post-Florence PIR has been initiated.
Mason Inlet Relocation Project (MIRP)
The USACE awarded the Atlantic Intracoastal Waterway (AIWW) contract to Southwind Construction on 27
November, construction schedule pending.
Carolina Beach Inlet (CBI)
Currituck completed a maintenance event on 26 November, removing ~7800 cubic yards with
management in the nearshore disposal area.
Refined Coastal Modeling (RCM)
The CB and KB refined coastal modeling efforts are ongoing.
WB, Post Authorization Change Report (PACR)
The USACE provided stakeholders a project update on 7 December.
st
execution date remains 1 Quarter 2020.
CB, Beach Renourishment Evaluation Report (BRER)
A project update has been tentatively scheduled for January 2019.
The USACE draft document release date is tentatively May 2019.
The non-federal Risk Reduction Plan is complete and awaiting submittal.
th
On Wednesday, December 19 the NC Division of Water Resources will lead the next Shallow Draft Inlet Long Term
Memorandum of Agreement stakeholders meeting. The meeting will be held from 10:30AM to 12:30PM at the Craven
Community College at 800 College Court, New Bern. The meeting will be in the Bosch Advanced Manufacturing Center,
Room 102.
Public Comment:
Adjourn