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Coastal wetlands How do coastal wetlands build and lose land?

Follow sediment, roots, erosion, compaction, sea-level rise, measurement, and adaptive shoreline management through how coastal wetlands build and lose land.

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

  1. Wetlands build their surfaceExplain how sediment, plants, channels, and organic matter build wetland elevation.Wetlands build their surface follows the physical and biological processes that add material.
  2. Loss lowers the platformDistinguish erosion, compaction, drainage, channel scour, and subsidence as different forms of surface loss.Loss lowers the platform separates visible removal from hidden lowering and altered soil conditions.
  3. Keeping pace with rising waterConnect relative sea level, sediment supply, plant production, delta change, and inland migration.Keeping pace with rising water tests when wetland gains can match local flooding change.
  4. Measuring elevation changeEvaluate benchmarks, marker horizons, cores, remote sensing, and budgets as evidence of elevation trajectory.Measuring elevation change turns a moving landscape into a calibrated, repeatable record.
  5. Managing a changing shorelineUse process diagnosis, living shorelines, tidal reconnection, migration planning, and thresholds in adaptation decisions.Managing a changing shoreline treats restoration as a monitored hypothesis that can be revised.

Questions this course answers

What determines whether a wetland gains elevation?

Elevation reflects the balance among deposition, plant production, erosion, compaction, decomposition, and subsidence.

Put a sediment pathway in order

Sediment must arrive and slow before it can settle, and later water determines whether it remains.

Why can a wetland surface sink without visible erosion?

Compaction and subsidence lower the reference surface even when particles are not visibly removed.

Why does drainage change more than water level?

Drainage exposes organic soil to air, changes microbial decomposition, lowers the surface as soil settles, alters plants, and can cut off sediment and tidal exchange.

What can help a wetland keep pace with rising water?

Mineral deposition and organic production can raise the surface, but their adequacy is site-specific.

Match each process with its role.

Wetland persistence depends on material supply, living growth, room to move, and local water-to-land height.

Grounded in trusted sources

  • NOAA National Ocean Service, What is a wetland?, https://oceanservice.noaa.gov/facts/wetland.html
  • U.S. Geological Survey, Sea-Level Rise Hazards and Decision Support - Coastal Wetlands, https://www.usgs.gov/centers/whcmsc/science/sea-level-rise-hazards-and-decision-support-coastal-wetlands
  • U.S. Geological Survey, Measuring and interpreting surface and shallow subsurface influences on coastal wetland elevation, https://pubs.usgs.gov/publication/70252804
  • National Park Service, How are Wetlands Formed?, https://home.nps.gov/subjects/wetlands/how.htm
  • NOAA Office for Coastal Management, Wetland Benefits, https://coast.noaa.gov/states/fast-facts/wetland-benefits.html
  • Wikimedia Commons MediaWiki API image records, https://commons.wikimedia.org/w/api.php

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

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