LIVING SHORELINES Bret M. Webb, PhD, PE, DCE August 28, 2018 GCRL - - PowerPoint PPT Presentation

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LIVING SHORELINES Bret M. Webb, PhD, PE, DCE August 28, 2018 GCRL - - PowerPoint PPT Presentation

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LIVING SHORELINES Bret M. Webb, PhD, PE, DCE August 28, 2018 GCRL Science Caf Series Ocean Springs, MS LIVING SHORELINES Bret M. Webb, PhD, PE, DCE August 28, 2018 ENGINEERING GCRL Science Caf Series Ocean Springs, MS Navigation

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LIVING SHORELINES

Bret M. Webb, PhD, PE, DCE August 28, 2018

GCRL Science Café Series – Ocean Springs, MS

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LIVING SHORELINES

Bret M. Webb, PhD, PE, DCE August 28, 2018

GCRL Science Café Series – Ocean Springs, MS

ENGINEERING

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Navigation

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Lessons

Who to Include Project Scale Implementation Flexibility Keys to Success

III.

Considerations

Design Environment Stressor ID Artificial Reefs Constructed Marshes Sandy Shorelines

II.

Background

What are living shorelines? Why use them? What are the technical challenges? What are the major

  • bstacles?

I.

August 28, 2018 | GCRL Science Cafe Series

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Living Shorelines…

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August 28, 2018 | GCRL Science Cafe Series

  • I. Background
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  • I. Background

Shoreline Armoring

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How did we get here? Population growth Residential development “Like dominoes” Undeveloped parcels >90% chance it will be armored

August 28, 2018 | GCRL Science Cafe Series

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  • I. Background

Shoreline Armoring

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How did we get here? Population growth Residential development “Like dominoes” Undeveloped parcels >90% chance it will be armored

August 28, 2018 | GCRL Science Cafe Series

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  • I. Background

Shoreline Armoring

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How did we get here? Population growth Residential development “Like dominoes” Undeveloped parcels >90% chance it will be armored

August 28, 2018 | GCRL Science Cafe Series

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  • I. Background

Shoreline Armoring

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How did we get here? Population growth Residential development “Like dominoes” Undeveloped parcels >90% chance it will be armored

August 28, 2018 | GCRL Science Cafe Series

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  • I. Background

Living Shorelines

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What are they? Natural approach to shoreline stabilization Uses appropriate organic materials Enough structure to accomplish goals, restore ecological and geological functions

August 28, 2018 | GCRL Science Cafe Series

Morris Landing, North Carolina

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  • I. Background

Living Shorelines

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Why use them?

Maintain natural shoreline function Preservation of the intertidal zone Water polishing A majority of shoreline retreat/erosion occurs slowly

  • ver time

August 28, 2018 | GCRL Science Cafe Series

Orange Beach, Alabama

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  • I. Background

Living Shorelines

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What are the technical challenges? Predictable performance Long-term resilience Using non-standard materials/devices Site-specific design Accounting for climate stressors

August 28, 2018 | GCRL Science Cafe Series

Mobile Bay, Alabama

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  • I. Background

Living Shorelines

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What are the obstacles?

Availability of qualified contractors Technology transfer Need for engineering ($) Permitting options, restrictions Stupid and untrustworthy people

August 28, 2018 | GCRL Science Cafe Series

Gulf Breeze, Florida

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‘Living shorelines’ use oyster shells and marsh grass to reverse coastal erosion

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August 28, 2018 | GCRL Science Cafe Series

https://www.pbs.org/newshour/show/living-shorelines-use-oyster-shells-and-marsh-grass-to-reverse-coastal-erosion

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  • II. Technical Stuff

Living Shorelines…

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August 28, 2018 | GCRL Science Cafe Series

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  • II. Considerations

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Design Environment

Get to know your site…

What are the critical coastal processes? What is the intended function? What needs to change in

  • rder to facilitate that

function or habitat?

August 28, 2018 | GCRL Science Cafe Series

Magnolia Beach, Fairhope

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  • II. Considerations

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Stressor ID

What’s the problem? Identify the stressors…

  • Waves
  • Currents
  • Sea Level Rise
  • Water Quality
  • Sediment Supply

August 28, 2018 | GCRL Science Cafe Series

Mobile Bay, Alabama

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  • II. Considerations

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Artificial Reefs

Tradeoffs… Reefs as breakwaters… Intertidal vs. subtidal reefs Agitation Material properties Location and predation

August 28, 2018 | GCRL Science Cafe Series

Little Bay Project, Bayou La Batre

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  • II. Considerations

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Constructed Marshes

Edge vs. Interior Edge erosion protection Construction Containment Wave tolerance Salt tolerance

August 28, 2018 | GCRL Science Cafe Series

Little Bay Project, Bayou La Batre

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  • II. Considerations

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Sandy Shorelines

Stabilization w/o trapping Low bank vs. high bank Sand transport pathways Trapping of longshore sand transport Barriers to cross-shore transport

August 28, 2018 | GCRL Science Cafe Series

Mon Louis Island, Alabama

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  • III. Lessons Learned

Living Shorelines…

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August 28, 2018 | GCRL Science Cafe Series

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  • III. Lessons Learned

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Coastal Scientists Coastal Ecologists Coastal Engineers

Who to Include

Interdisciplinary

The most successful projects will include coastal scientists, coastal engineers, and coastal ecologists… especially when those projects are ecosystem scale

August 28, 2018 | GCRL Science Cafe Series

We want to be here!

Kari Servold

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  • III. Lessons Learned

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Project Scale

Success at all scales

Success can be scale independent…

August 28, 2018 | GCRL Science Cafe Series

Dog River Park – Boat Launch

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  • III. Lessons Learned

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Flexibility

Things change…

Things change during a project, so it’s best to remain flexible throughout the process…

August 28, 2018 | GCRL Science Cafe Series

Old Oak Tree

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  • III. Lessons Learned

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Keys to Success

Stem to stern

The most successful projects are those that are properly planned BEFORE a contractor is selected… Get your best plan together at the time of the funding request…

August 28, 2018 | GCRL Science Cafe Series

Offshore Reef, Mobile Bay

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  • III. Lessons Learned

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Good Example

Good Project

Project Green Shores Appropriate expertise Good design Stakeholder engagement Highly visible

August 28, 2018 | GCRL Science Cafe Series

Pensacola, Florida

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  • III. Lessons Learned

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Good Example

Bad Project

No design “Demonstration” project Use of non-standard approaches Lack of experienced coastal practitioners

August 28, 2018 | GCRL Science Cafe Series

Mobile Bay

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  • III. Lessons Learned

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Good Example

Bad Project

“Marsh restoration” project Re-establish prior shoreline, create tidal marsh, tidal creeks, etc. Converted ~1500 feet of sandy bay shoreline to continuous rock structure

August 28, 2018 | GCRL Science Cafe Series

Mobile Bay

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  • III. Lessons Learned

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Bad Example

Good Project

Best project you will never know about or see Project designed using standard coastal engineering tools Removed as result of law suits, enforcement action, etc.

August 28, 2018 | GCRL Science Cafe Series

Mobile Bay

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  • IV. Resources (the hidden content)

Living Shorelines…

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August 28, 2018 | GCRL Science Cafe Series

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Resources…

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Homeowners Guide

A Guide for (Alabama) Property Owners

Strategies Regulatory Framework Project Costs Material Selection

August 28, 2018 | GCRL Science Cafe Series

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Resources…

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Contractor Guide

Introduction to Living Shoreline Management Practices

Elements Advantages Suitability & Selection Analysis & Design Examples

August 28, 2018 | GCRL Science Cafe Series

LIVING SHORELINES

A TECHNICAL GUIDE FOR CONTRACTORS IN ALABAMA & MISSISSIPPI An Introduction to Living Shoreline Management Practices 2016

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Resources…

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August 28, 2018 | GCRL Science Cafe Series

http://www.southce.org/bwebb/?p=2381

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Living Shorelines: Fundamentals

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National Overview Regional Chapters Case Studies Lessons Learned

August 28, 2018 | GCRL Science Cafe Series

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Federal Highway Administration

Nature-Based Solutions for Coastal Highway Resilience

White Paper Regional Peer Exchanges Implementation Guide Pilot Projects & Partnerships

August 28, 2018 | GCRL Science Cafe Series

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Coastal ecosystem restoration, at any scale, requires an integration of coastal ecology and coastal engineering to be truly successful.

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August 28, 2018 | GCRL Science Cafe Series

Dauphin Island East End