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Dune How do coastal dunes protect shores and host life?

Follow windblown sand, dune plants, storm reshaping, wildlife habitat, and restoration at the moving edge of the coast.

4
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Sand arrives and a dune takes shapeExplain how wind, sediment supply, vegetation, and water shape coastal dunes.Dunes grow from moving beach sand and develop distinct ridges, slopes, and wet hollows.
  2. Roots, shelter, and dune lifeConnect dune plant adaptations and physical shelter to habitat diversity.Specialized plants trap sand and create contrasting microhabitats for coastal life.
  3. When storms reshape the coastDescribe dune erosion, overwash, and the sediment-based path to recovery.Storms can remove or move dune sand, while calmer conditions and surviving plants support rebuilding.
  4. Managing a moving landformEvaluate human impacts, restoration choices, and monitoring for dune resilience.Effective dune management works with sediment movement and tests whether habitat and structure persist.

Questions this course answers

What makes a coastal dune grow?

Dunes grow when sediment supply, wind, space, and sand-trapping surfaces allow grains to accumulate.

Put the dune-building sequence in order

A dune forms through repeated transfers from beach sediment to wind-driven deposition and accumulation.

Why can a dune slack support different life from a dry ridge?

Low depressions between dunes can intersect groundwater and form temporary wetlands.

How do dune plants change the physical habitat?

Plants are active parts of dune formation and stabilization, not just occupants of finished sand.

What is overwash?

Overwash transports sand from the seaward side across the dune and onto the island interior.

Put storm erosion and recovery in order

Storms redistribute sediment, while later wave and wind conditions can return material and support regrowth.

Grounded in trusted sources

  • National Park Service, Aeolian (Dunes) Landforms - Geology, https://www.nps.gov/subjects/geology/aeolian-landforms.htm
  • National Park Service, Dune Communities - Gulf Islands National Seashore, https://www.nps.gov/guis/learn/nature/dune-communities.htm
  • National Park Service, Coastal Dunes - Point Reyes National Seashore, https://www.nps.gov/pore/learn/nature/plantcommunity_dunes.htm
  • U.S. Geological Survey, Storm-Induced Coastal Change, https://www.usgs.gov/centers/spcmsc/science/storm-induced-coastal-change
  • NOAA National Centers for Coastal Ocean Science, What’s Inside a Dune Influences Erosion and Storm Resilience, https://coastalscience.noaa.gov/news/whats-inside-a-dune-influences-erosion-and-storm-resilience-in-north-carolinas-outer-banks/
  • NOAA National Centers for Coastal Ocean Science, Understanding Processes Driving Sand Dune Erosion and Creation, https://coastalscience.noaa.gov/news/understanding-processes-driving-sand-dune-erosion-and-creation-on-an-atlantic-seashore/

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

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