Snohomish Estuary Restoration Effects on Temperature, Salinity, and Tides: Difference between revisions

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==Goals and Objectives ==
==Goals and Objectives ==

Revision as of 16:01, 16 May 2022


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Snohomish RestorationProjects Zackeyetal.jpg

Goals and Objectives

The goal of this study is to inform restoration design and strategies by evaluating the potential short term, and future Climate Change (CC) scenarios, impacts to water quality and conditions utilizing existing data and hydrodynamic modeling in two phases.

Phase I

Goals
Assess the short-term impacts of large-scale estuary restoration (LSER) projects at site and estuary scales in the Snohomish River estuary by analyzing eight years of water temperature, salinity, and level data, spanning pre- and post-restoration conditions. This analysis will be used to evaluate whether the range/distribution of thermal conditions and/or mixohaline (salinity) habitats change after restoration. This will also help to develop a better understanding of the short-term impacts caused by large-scale restoration and will use fish sampling data to help evaluate the potential impacts on juvenile salmon and inform the design process to ensure these impacts are minimized.

  • Compare of per-restoration and post restoration data
  • Compare of upstream and downstream data
  • Compare of data across distributary channels

Deliverables

  • Report on analysis/assessment of large scale estuary restoration projects effects on site and system-wide water temperature, salinity, and tidal inundation with implication on restoration design.
  • Compiled temperature, salinity, and water elevations for Snohomish Estuary


Phase II

Goals
Phase 2 will explore future conditions in the Snohomish estuary by assessing estuary-wide future impacts of large-scale estuary projects on water temperatures, shifts in the mixohaline conditions, and currents by modeling a series of future scenarios, restored and unrestored, under projected future climate change conditions to better understand the estuary-wide and future impacts of large-scale estuary projects on estuary water temperatures, shifts in mixohaline conditions, and velocities that may affect juvenile salmon rearing patterns. This analysis will be used to evaluate cumulative effect scenarios such as (1) how estuarine conditions change with additional (planned/hypothetical) restoration with expected climate change impacts. Phase 2 modeling efforts are likely to change some after results of phase 1 are assessed and from feedback from the advisory group formed under phase 1 of the project. By answering these questions, we will have a better understanding of the potential cumulative short-term impacts of large-scale estuary restoration projects and if these short-term impacts may be exacerbated under future climate change conditions. This information can then be used to further refine estuary restoration designs, strategies, and implementation.

  • Evaluate potential cumulative impacts from full restoration scenario assessed under current conditions
  • Evaluate potential cumulative impacts from full restoration scenario assessed under future climate change scenario.
  • Incorporate updated LiDAR (2019), bathymetry (2020), and data logger network data into new FVCOM model run.

Deliverabes

  • Model results showing temperature, salinity, and water elevation system-wide effects for restoration under current climatic conditions
  • Model results showing temperature, salinity, and water elevation system-wide effects for restoration under projected climate change conditions
  • Report summarizing modelling results and implication on restoration design

Notes

Please contact Todd Zackey (tzackey@tulaliptribes-nsn.gov) with any questions regarding this project.

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