Technical Standards for Beach Fill Projects
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Technical Standards for Beach Fill Projects

15A NCAC 07H. 0312. February 14, 2018. Ken Richardson. CRC Meeting – . Sunset Beach. , NC . Introduction. 07H .0312(1) . Characterize Native Beach Sediment. 07H .0312(2) . Characterize Borrow Area Sediment.

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Technical Standards for Beach Fill Projects




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Presentation on theme: "Technical Standards for Beach Fill Projects"— Presentation transcript:

Slide1

Technical Standards for Beach Fill Projects 15A NCAC 07H. 0312

February 14, 2018

Ken Richardson

CRC Meeting –

Sunset Beach

, NC

Slide2

Introduction07H .0312(1)

Characterize Native Beach Sediment

07H .0312(2) Characterize Borrow Area Sediment07H .0312(3) Determine Sediment Compatibility07H .0312(4) Excavation and Placement of Sediment

Sediment Criteria: Outline

Slide3

Sediment Criteria: Introduction

Goal:

ensure that sand used for beach nourishment is compatible with existing sand on the beach.Science Panel developed sediment characterization & compatibility standards (2002-2007)Rule Adopted: CRC adopted & with an original effective date of February 1, 2007

To Reach the Goal – Must First Define Compatibility:

requires sediment analysis of both the existing beach and potential borrow sites.

Grain Size

Composition

Slide4

1) Characterize Native Beach Sediment

Note:

Recipient beach characterization not required if sand is coming from a navigation channel.

Minimum of 13 samples required on each transect

2,400 ft.

-20 ft.

Slide5

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2

3

4

5

6

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2) Characterize Borrow Area Sediment

http://what-when-how.com/gps/gps-applications-part-2/

http://www.sgsurveys.ae/projects3.html

http://www.nauticalcharts.noaa.gov/mcd/learnnc_surveytechniques.html

Multibeam (swath)

vs.

Single-beam

Seafloor Imaging

Slide8

2) Characterize Borrow Area Sediment

Swath Bathymetry

multibeamSidescan Sonar

Vibracores

Geophysical Subsurface

Core Sampling

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2

3

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3) Determine Sediment Compatibility

+15% CaCO

3North Topsail ExampleBorrow Area

Mean Grain

Size (mm)

0.21

Phi Sorting

1.07

Silt

Percentage (%)

6.82

Volume (cy)

7,581,634

Example: CP&E, 2006

76

granules

gravelsilt5%“Gravel”10%“Granular”NoRestrictions5%“Fine”

sand

4.76

2

1

0.500.25

0.125

0.0625

Grain Size (mm)

Compatibility Threshold Category

(weight % allowable above native beach)

Slide13

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Slide14

Native beach

4. Excavation and Placement of Sediment

“You’ll know it when you see it”

Native beach

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3

Slide16

Sediment Criteria: Proposed Amendments Discussion

Ken Richardson

Shoreline Management Specialist

NC Division of Coastal Management

Ken.Richardson@ncdenr.gov

Stakeholders:

Greg “Rudi” Rudolph – Carteret County Shore Protection

Layton Bedsole – New Hanover County

Spencer Rogers – NC Sea Grant

Chris Freeman – Geodynamics

Ken Wilson – APTIM

Johnny Martin – Moffatt & Nichol