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Rising seas How do coastal wetlands respond to sea-level rise?

Trace flooding, elevation, sediment, subsidence, migration, adaptation, monitoring, and thresholds through coastal wetlands facing sea-level rise.

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

  1. The shoreline is movingExplain relative sea level, changing flood frequency, plant tolerance, and thresholds in coastal wetlands.Wetlands respond to water levels relative to land, and gradual flooding can push systems toward ecological thresholds.
  2. Elevation is a balanceConnect accretion, roots, compaction, subsidence, storms, and sediment supply to marsh surface elevation.A wetland keeps pace only when elevation gains exceed combined losses beneath and at its surface.
  3. Wetlands can move inlandExplain landward migration, coastal squeeze, tidal pathways, and changing wetland communities.Horizontal adjustment requires suitable ground, connected water, and space beyond fixed barriers.
  4. Adaptation has limitsEvaluate restoration, living shorelines, thresholds, and monitoring as conditional responses to sea-level rise.Adaptation is a tested landscape decision shaped by local processes, limits, and evidence.
  5. Living with a changing coastUse scenarios, indicators, connectivity, and revision to plan for changing coastal wetlands.Long-term adaptation keeps options open and uses monitoring to update landscape decisions.

Questions this course answers

What does relative sea level compare?

Wetlands respond to water levels relative to the land surface beneath them.

Put this first-pass assessment in order.

A useful assessment connects physical measurements to ecological change and then to a decision.

Why is sediment deposition alone not proof that a marsh is gaining elevation?

Net surface elevation includes deposition as well as subsurface losses.

Match each process to its likely effect.

A wetland elevation budget includes gains and losses above and below the surface.

Why does a wetland need migration space?

Horizontal movement can complement vertical elevation gain.

A hard barrier that traps a wetland between rising water and fixed land can create coastal ___.

Coastal squeeze prevents the landward migration that could replace seaward losses.

Grounded in trusted sources

  • U.S. Geological Survey, Coastal marsh responses to rising seas: Surface elevation dynamics in coastal marshes along the northwestern Gulf of America, https://www.usgs.gov/programs/ecosystems-land-change-science-program/news/coastal-marsh-responses-rising
  • U.S. Geological Survey, Constraints on the adjustment of tidal marshes to accelerating sea level rise, https://www.usgs.gov/publications/constraints-adjustment-tidal-marshes-accelerating-sea-level-rise
  • 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, What are Key Conditions for Marsh Survival Amid Rising Seas?, https://www.usgs.gov/programs/cmhrp/news/what-are-key-conditions-marsh-survival-amid-rising-seas
  • U.S. Environmental Protection Agency, About Coastal Wetlands, https://www.epa.gov/wetlands/about-coastal-wetlands
  • National Park Service, Sea Level Rise, https://home.nps.gov/subjects/oceans/sea-level.htm
  • 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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