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Wetland resilience How do coastal wetlands keep pace with rising seas?

Follow relative sea level, sediment, roots, elevation, migration space, stress, monitoring, and adaptation through coastal-wetland resilience.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. The water level is relativeExplain why local relative sea level and flooding, not a global number alone, control wetland exposure.Wetlands occupy a vertical flooding window that shifts with tides, storms, and land movement.
  2. Wetlands build elevationDescribe mineral sediment, roots, compaction, and reference-based measurements of wetland elevation.A wetland can build upward through sediment and plants, while compaction and subsidence reduce the gain.
  3. Marshes can move inlandExplain migration space, coastal squeeze, scenario maps, and the changing habitat mosaic.Landward movement can offset some loss only where elevation and connected space remain available.
  4. Stress and recovery are unevenConnect flooding, erosion, salinity, light, storms, and restoration to uneven wetland responses.Wetland condition can decline before area disappears, and recovery depends on local processes.
  5. Evidence guides adaptationUse monitoring, models, uncertainty, and adaptive management to evaluate coastal-wetland futures.Good adaptation links measured rates to decisions and updates them as the evidence changes.

Questions this course answers

What does relative sea level compare?

Wetlands respond to water relative to local ground, including land movement and tides.

Put a local keep-pace assessment in order.

A comparison needs a reference, repeated measurements, rates, and cautious interpretation.

Which process can add mineral elevation to a marsh?

Floodwater can deposit sand, silt, and clay on the wetland surface.

Match each observation with what it helps reveal.

Different methods separate deposition, elevation, roots, and inundation.

What is coastal squeeze?

Hard infrastructure or steep land can block migration while the seaward edge is lost.

Put a migration map reading in order.

Maps depend on inputs and assumptions that should be checked and tested.

Grounded in trusted sources

  • https://www.usgs.gov/publications/surface-elevation-table-and-marker-horizon-technique-a-protocol-monitoring-wetland
  • https://www.usgs.gov/centers/whcmsc/science/sea-level-rise-hazards-and-decision-support-coastal-wetlands
  • https://www.coast.noaa.gov/digitalcoast/data/slr-wetland.html
  • https://coastalscience.noaa.gov/project/salt-marsh-ecology-era-sea-level-rise/
  • https://pubs.usgs.gov/publication/fs20233039/full
  • https://www.nature.com/articles/s44358-024-00004-x

Every Wunder lesson is built from real, reputable sources — never invented.

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