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📘 How can communities adapt to coastal erosion?

Stand on the filled patch of North Carolina Highway 12 above Rodanthe. After Hurricane Irene, USGS paired photographs of the same cottage with a new inlet cutting the road — the sand had not vanished; it had moved.

5
lessons
~25 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Read the moving shorelineExplain how waves, tides, currents, and sediment transport move coastal material from one place to another.Erosion is a connected sediment process. The grains you lose are usually still in the system.
  2. Make room for adjustmentInterpret beaches, dunes, overwash, barrier islands, and marsh edges as moving landforms.Coastal forms reorganize across seasons, storms, and changing water levels if they have space.
  3. Work with living systemsConnect roots, reefs, habitats, and sediment supply to coastal stability and recovery.Biology and geology can resist or redirect erosion, but only while sediment and room remain.
  4. Choose an interventionCompare armoring, nourishment, living shorelines, setbacks, and relocation as different responses.Every intervention changes exposure and often changes sediment pathways around it.
  5. Turn observations into decisionsUse defined shorelines, DSAS-style rates, elevation data, and storm comparisons to evaluate change.Reliable decisions come from defined measurements, comparisons, uncertainty, and a threshold for the next choice.

Questions this course answers

What does USGS treat coastal erosion as?

USGS defines erosion as sediments taken from one area of coastline and deposition as those sediments moved to another place.

Put this sediment pathway in order.

Forces mobilize grains before transport and eventual deposition or export.

Why can a barrier island migrate inland?

USGS treats overwash as water overtopping dunes and pushing sand inland; NOAA calls a barrier island a constantly changing sand deposit.

Match each feature with its role.

Each feature participates in a different pathway of coastal change.

What can roots do at a wetland edge?

Roots reinforce soil, but their effect depends on plant health and physical conditions.

Put a simple dune-building pathway in order.

Vegetation and roughness help convert wind transport into dune storage.

Grounded in trusted sources

  • U.S. Geological Survey, Coastal Change, https://www.usgs.gov/science/science-explorer/coasts/coastal-change
  • U.S. Geological Survey, Digital Shoreline Analysis System (DSAS), https://www.usgs.gov/centers/whcmsc/science/digital-shoreline-analysis-system-dsas
  • U.S. Geological Survey, National Shoreline Change, https://www.usgs.gov/data/usgs-national-shoreline-change-a-compilation-published-shoreline-change-rates-1800s-2010s
  • NOAA Ocean Service, What is shoreline armoring?, https://oceanservice.noaa.gov/facts/shoreline-armoring.html
  • NOAA Ocean Service, What is a living shoreline?, https://oceanservice.noaa.gov/facts/living-shoreline.html
  • NOAA Fisheries, Understanding Living Shorelines, https://www.fisheries.noaa.gov/insight/understanding-living-shorelines
  • NOAA Ocean Service, What is a barrier island?, https://oceanservice.noaa.gov/facts/barrier-islands.html

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

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