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York River EstuaryYork River Breakwaters including VIMS shoreline g
project 2010
C. Scott Hardaway, Jr.Geologist
Shoreline ErosionShoreline Erosion
Shoreline ErosionShoreline Erosion
Management StrategiesManagement StrategiesBulkheadsBulkheads
RevetmentsManagement StrategiesManagement Strategies
Revetments
RevetmentsManagement StrategiesManagement Strategies
Revetments
StormYorktownYorktown
Storm
Post StormYorktownYorktown
Post Storm
Pre Project 1994YorktownYorktown
Pre-Project, 1994
BreakwatersDesign CriteriaDesign Criteria
Annual Significant Storm Tangential
Beach R/R =0 81
Breakwaters
Storm
Farshore
F t h
gWinds Winds Beach
90°
90°
ROrthogonal
R/R =0.81O
Annual Significant
Fetch
StormFetchFetch
Windows
SMB Output (H&T)RCP WAVE I t
90°
90°
Control Line (R )O
Wave Crest Line
Wave Orthogonal DiffractionPoint Spiral
B hAnnual Storm
Resultant Wave Vectors H&at Site
RCPWAVEBathymetric
Grid
RCP WAVE Input
LB
G
o t
Possible HeadlandAlignment Possible Extentof Headland
pBeachSection
al
Tangent Section
Tang
BW BW
SpiralSection
GB
Mb
L =BW LengthG =Bay GapM =IndentationB =Beach Width
B
B
b
m
Spi ra
angent
Project Upland
Bm
Post ProjectYorktownYorktown
Post Project
Chesapeake Bay Chesapeake Bay Breakwater DataBreakwater Data
BaseBase
Selected Sites
BreakwatersDesign CriteriaDesign Criteria
A'
Breakwaters
A'
Gb
Lb
Xb hB
Base of Bank
MHWTombolo BW
A - A'BW
o
BW
AMb
Tombolo
Gb Breakwater gapXb Distance offshore C breakwater to original MHWMb Maximum bay indentation
BW Breakwater
LCL
To
Base of Bank or Bulkh
Bm
BI
Salie
nt
Mb Maximum bay indentation, C breakwater to MHW
Bl Initial beach width, base to bank to MHWBm Present beach width, base to bank to MHWhb Water depth from bottom to MHW at breakwater
Lb Breakwater crest lengthL
Toe of Beach
Present MHWOrig inal MHW
ulkhead
hb Water depth from bottom to MHW at breakwater
1 0
1.65
1.0
Based on Wind/Wave DirectionRelationshipsRelationships
Unidirectional Wind Wave Climate
Based on Wind/Wave Direction
• Mb:Gb Range: 1:1.6 to 1:2.5; average = 1:1.9
• Lb:GbLb:GbRange: 1:1.5 to 1:2.0; average = 1:1.8
Bimodal Wind Wave ClimateBimodal Wind Wave Climate• Mb:Gb
Range 1:1.0 to 1:1.7; average = 1:1.4Lb:GbLb:GbRange : 1:1.0 to 1:1.5; average = 1:1.2,
Overall Average Mb:Gb = 1:1.65Lb:Gb = 1:1.40
YorktownYorktown19 May 1999
17 Oct 2010YorktownYorktown17 Oct 2010
29 Oct 2010YorktownYorktown29 Oct 2010
29 Oct 2010YorktownYorktown29 Oct 2010
Other York River Other York River BW SitesBW Sites
From Google EarthBW SitesBW Sites
Gloucester Point 1937
Virginia Fisheries Lab 1951
Gloucester Point 1968
VIMS 1965
VIMS bulkhead 1964
VIMS East Jan 1 1978VIMS East Jan 1, 1978
Northeaster April 26 1978Northeaster April 26, 1978
VIMS East Sill July 1980
VIMS EastJan 1984
VIMS West 1983
VIMS West BwsMay 1986
Ferry Pier: Isabel
VIMS East Post Isabel
VIMS East Post Isabel
2003Gloucester Point/VIMSGloucester Point/VIMS
2003
Ernesto: Sept. 1, 2006
Shoreline Management PlanVIMSVIMS
Shoreline Management Plan
2010Gloucester Point/VIMSGloucester Point/VIMS
2010
Pre ProjectVIMSVIMS
Pre-Project
During ConstructionVIMSVIMS
During Construction
During ConstructionVIMSVIMS
During Construction
Post ConstructionVIMSVIMS
Post Construction
VIMS West: 2010VIMS West: 2010
VIMS East: Post-construction: 2010
VIMS East: January 2011VIMS East: January 2011
Summary for York RiverExisting Shore StructuresExisting Shore Structures
Summary for York River
Bulkheads•10.5 miles
Riprap Revetments•14 miles
Breakwater Sites• 21 sites along the York RiverBreakwater Systems s tes a o g t e o e• Minimum site length 300 ft• Maximum site length 3,200 ft
•3.3 miles
• Number of BW units, 102• Number of Bays, 102
Questions?Questions?For Mr. Hardaway
Yorktown, Virginia: York River and Coleman Bridge in background
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