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Eroding marsh edge How do coastal wetlands erode and rebuild?

Trace erosion, deposition, roots, storms, shoreline change, sediment budgets, monitoring, and restoration through how coastal wetlands erode and rebuild.

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

  1. Edges are always movingExplain why wetland edges, channels, and mudflats shift through linked erosion and deposition.A wetland boundary is a changing balance of flow, sediment, and vegetation.
  2. Water sorts the sedimentTrace how currents, plants, barriers, reefs, and shallow habitats sort and retain sediment.Water movement determines where particles settle, travel, or return to suspension.
  3. Living ground can rise or sinkDistinguish accretion from elevation change and describe the roles of roots, organic matter, burrows, and subsidence.Wetland elevation is built and lost through surface and subsurface processes.
  4. Storms create pulsesEvaluate how storms redistribute sediment, water, vegetation, and energy across connected coastal habitats.Storms create gains and losses that must be measured beyond the first visible deposit.
  5. Measure before managingDesign evidence-based shoreline monitoring and process-based restoration assessments.Good decisions connect maps and measurements to a specific mechanism and repeated outcome tests.

Questions this course answers

Why can a shoreline retreat while a marsh surface gains elevation?

Edge position and interior elevation respond to different flows, so one can retreat while the other gains material.

What can happen when flow becomes concentrated in a shallow depression?

Concentrated flow can scour and extend a channel, although roots and sediment supply may slow or redirect that growth.

Why do plants often encourage sediment deposition?

Vegetation increases roughness and reduces current speed in places, giving suspended particles more opportunity to settle.

Put a sediment-transport investigation in a sensible order.

The investigation begins with a system map, gathers measurements, compares them through time, and then evaluates the consequences.

What does a surface elevation table help measure?

A surface elevation table tracks surface movement relative to a stable reference below the active soil.

Why are roots important to wetland elevation?

Root production can add below-ground material and stabilize soil, but it works alongside deposition, decomposition, and subsidence.

Grounded in trusted sources

  • U.S. Geological Survey, Coastal Change, https://www.usgs.gov/science/science-explorer/coasts/coastal-change
  • 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, Spatial Distribution of Elevation Change Monitoring in Coastal Wetlands, https://pubs.usgs.gov/publication/fs20233039/full
  • U.S. Geological Survey, Changes in wetland sediment elevation following major storms, https://www.usgs.gov/publications/changes-wetland-sediment-elevation-following-major-storms-implications-estimating
  • U.S. Environmental Protection Agency, About Coastal Wetlands, https://www.epa.gov/wetlands/about-coastal-wetlands
  • NOAA Office for Coastal Management, Sea Level Rise Wetland Impacts and Migration, https://www.coast.noaa.gov/digitalcoast/data/slr-wetland.html

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

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