A Literature Review (IMW) and Knowledge Synthesis Ken Fetcho and - - PowerPoint PPT Presentation

(IMW)

Ken Fetcho and Renee Davis OWEB Board Meeting Jon Souder (OSU) January 30, 2018

Ecological Effects of Tide Gate Restoration: A Literature Review and Knowledge Synthesis

Presentation Overview

 Significance of the tide gate topic  Purpose of literature review  Presentation outline

• Tide gate report overview
• Report summary
• Introduction to the issue
• Key findings
• Recommendations
• Lessons learned
• Next Steps

Report Organization

∗ Executive Summary ∗ Ch. 1 - Introduction – Tide gate basics ∗ Ch. 2 - Methods ∗ Ch. 3 - Summary of ecological effects of tide gates and importance of estuary habitat ∗ Ch. 4 - Overview of work to determine tide gate restoration effects to salmonids and environmental factors ∗ Ch. 5 - Regional tide gate restoration and monitoring project summaries

Report Organization

∗ Ch. 6 - Thinking systematically about tide gates ∗ Ch. 7 – Summary of findings and recommendations ∗ Appendices ∗ Literature Cited

Literature Review

Ecological Effects of Tide Gate Upgrade or Removal: A Literature Review and Knowledge Synthesis Institute for Natural Resources Oregon State University

Overview

• 1. How Tide Gates Work
• 2. Context For Restoration
• 3. Ecological Effects of Tide Gates
• 4. Restoration Approaches
• 5. Findings & Recommendations

How Tide Gates Work

Neap Tides Spring Tides

Daily & Monthly Tidal Cycles

Trade-Offs

• 1. Opening Size & Angle
• 2. Water Velocity
• 3. Period Open

Side-hinged Mitigator Muted Tidal Regulator (MTR)

Photos courtesy of Nehalem Marine

Context: Tide Gate Geography

• 1. Stream/River

Mouth

• 2. Tributary

Mouth

• 3. Field

Drain/Ditch

Context: Project Goals

• 1. Infrastructure

Protection

• 2. Fish Passage

Improvement

• 3. Estuarine Rearing

Habitat

• 4. Flood Control

• 1. Tide Gate Removal or

Upgrade

• 2. Dike Removal and/or

Setback

• 3. Channel Re-

meandering

• 4. Vegetation & Wood

Placement

Effects: Water Quality

• Summer Water

Temperature Higher

• Dissolved Oxygen

(DO) Lower

• Abrupt Change in

Salinity

• Inhibited Sediment

Transport

Native : Exotic Proportions

• Reference Sites: Mostly Natives / Few

Exotics

• Behind Gates: Non-game Native & Exotics

Fish Abundance

• Behind Gates: Natives Still Predominant
• Potential Climate Change Effects

Conventional

Single Life History

Current

Multiple Life Histories

0% 5% 10% 15% 20% 25%

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Spawning Year

Freshwater Survival OWEB #212-2044

Larson Creek (CoosWA) Palouse Creek (CoosWA) WF Smith River (ODFW) Winchester Creek (ODFW)

Response: Remove Tide Gate

Best Tide Gate = No Tide Gate

→ Multi-faceted Estuarine Restoration

Response: Upgrade Tide Gates

Upgrades = Incremental Improvement

• Best Conditions: ≈ 50% Open
• Better Passage + Better Water Quality

Restoration Benefits

• Just Gate Upgrade ≠ Restoration
• Habitat Determines Benefits

Finding: Incremental Continuum

Upgrade with Muted Tidal Mechanism Replace & Resize Complete Structure Multi-faceted Restoration

$ $

Finding: Program Benefits

• Designated

Restoration Areas

• Permitting Facilitated

For Upgrades

• Leverages Funding

Sources

• Improves

Communication

Finding: Incorporate Mitigation

• 1. Largest Restoration Programs

Driven By Mitigation Needs

• 2. Mitigation Expands Funding
• 3. Leverages Restoration Funds
• 4. Requires Effectiveness Monitoring

Finding: Program Monitoring

• 1. Need Consistent Protocols
• 2. Longer Time Frames (10+ Years)
• 3. Estuarine Restoration Benefits Known
• 4. Need Tide Gate Upgrade Information

Authors

• Jon Souder, OSU Forest Engineering,

Resources & Management

• Guillermo Giannico, OSU Fisheries & Wildlife
• Londi Tomaro, Institute for Natural Resources
• Jeff Behan, Institute for Natural Resources

Next Steps

 Dissemination of Findings  Explore connections to tide gate

‘Big Table’ effort

 Evaluate future monitoring needs

McDonald Slough – pre- and post-project

Questions?