17 May 2016 Hunting Island State Park Beach Restoration Project

17 May 2016 Hunting Island State Park Beach Restoration Project 17 May 2016 Hunting Island State Park Beach Restoration Project - Start

2018-03-11 32K 32 0 0

Description

Project Setting. Project Setting. Hunting Island is ~ . 4 miles long. Heavily influenced by St Helena Sound. Loss of 1,000-2,500 . ft. between 1857 and 1979. Volume loss of around 300,000 cy per year. ID: 646670 Download Presentation

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17 May 2016 Hunting Island State Park Beach Restoration Project




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Presentations text content in 17 May 2016 Hunting Island State Park Beach Restoration Project

Slide1

17 May 2016

Hunting Island State Park Beach Restoration Project

Slide2

Project Setting

Slide3

Project Setting

Hunting Island is ~

4 miles long

Heavily influenced by St Helena Sound

Loss of 1,000-2,500 ft between 1857 and 1979Volume loss of around 300,000 cy per yearEight previous nourishment projects totaling over 5 million cy

Slide4

Historical Shoreline

Over 2,000

ft

of Erosion along north end of Hunting since 1850’sHarbor southern accretion accelerated in ~1970s – over 2,000 ft accretion185719201933

19641971

198720002011

Slide5

2006 Hunting

Island

Previous Project

2006: 570,000 cy nourishment (Design) 2007: Construction of 6 groins in three “clusters”Required post-project monitoring of

downcoast impacts

Slide6

Sand Searches & Borrow Areas

2006 Plan

2006 As-built

Slide7

Three Recreation Areas

Strategic Nourishment for Groins

Feb 2006

June 2006

Feb 2007

Long-Term Erosion Rate = ~25 ft/yr

Nourished Seven (7) Times Prior To Project

Project Completed On Time Within PRT’s Budget

Slide8

2005

2007

2008

2010

20112012

Slide9

Volumetric Erosion Rates

Island-wide Changes

Project areas gained ~561,000 cy during nourishment

Same areas still hold 414,000 cy in 2015Net loss of 147,000 since nourishmentErosion rate decreased in areas updrift of groins from ~18 cy/ft per year to <5 cy/ft per year

Slide10

Cabin Road Area Changes

South

Groin 8

2004-2009

2009-2015

Slide11

Conditions

~9

years post installation

Hunting Island

6

7

8

Slide12

2016

~9 years post installation

Existing Conditions

Slide13

Proposed Project

Plan

Nourishment of a total of 10,400 lf of beach

Maximum Nourishment Volume = 630,000cy

Two Nourishment Areas – Campground, North-South BeachTwo new ~450 ft groins (#2 and #5A)Two potential offshore borrow areasNo work north of groin #1 or along south endPurposeRestoration of beach areaReduction of erosion ratesProtection of park infrastructureRestoration/Protection of beach habitat

Slide14

Project Plan

Slide15

Project Plan

Slide16

Proposed Project

Plan

Nourishment will occur in winter months (outside of turtle nesting season)

“Piggybacking” project with Edisto Beach to reduce costs

Groin construction will occur during or immediately after nourishmentMonitoring proposed including shorebird surveys, lighting surveys, beach topography surveys, aerial photos, sediment analysis, downdrift impactAnticipated construction length ~4 months

Slide17

Proposed Project

Additional Actions

Completion of a Biological Assessment (this week)

Completion of an updated

Downdrift Impact AssessmentAdditional geotechnical data collectionPre construction surveys and monitoring


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