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Beach How do beaches move sand and recover?

Follow sediment budgets, waves, currents, storms, dunes, habitat, nourishment, and the evidence behind resilient beach choices.

5
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Sand is a moving budgetExplain beaches as sediment stores with sources, sinks, and seasonal exchange.A beach is a visible part of a larger sediment budget, not a fixed line.
  2. Waves and currents move grainsTrace how waves, swash, currents, wind, and dunes transport beach sediment.Grains move through linked cross-shore, longshore, and aeolian pathways.
  3. Storms redraw the profileDistinguish storm erosion, overwash, recovery, structures, and profile measurement.Storms redistribute sediment quickly, while recovery depends on what remains available.
  4. Beaches are habitatsConnect sediment dynamics with dunes, wrack, nesting, feeding, and neighboring habitats.Beach life depends on the shifting physical zones that sediment movement creates.
  5. Choices change sediment pathwaysEvaluate groynes, nourishment, fences, restoration, monitoring, and space to move.Coastal choices work best when they respect sediment pathways and measure consequences.

Questions this course answers

What does a sediment budget compare?

A sediment budget tracks sources, transport, storage, and losses.

Why can a narrow beach still contain nearby sand?

Visible width is only one part of a three-dimensional sediment system.

What generates a longshore current?

Oblique wave approach releases energy into flow parallel to the shore.

What is one role of dune vegetation?

Plants reduce near-surface wind speed and help retain aeolian sand.

Where can storm-eroded beach sand go?

Storms redistribute sediment among connected coastal zones.

Why repeat beach profiles?

Repeated transects show where material accumulated or was removed.

Grounded in trusted sources

  • NOAA National Ocean Service, Longshore Currents https://oceanservice.noaa.gov/education/tutorial_currents/03coastal2.html
  • U.S. Geological Survey, Sediment Budget - Waves, Currents, and Storm Surges https://pubs.usgs.gov/of/2003/of03-337/budget.html
  • U.S. Army Corps of Engineers, Beach Nourishment https://www.iwr.usace.army.mil/Missions/Coasts/Tales-of-the-Coast/Corps-and-the-Coast/Shore-Protection/Beach-Nourishment/
  • U.S. Geological Survey, Coastal Change https://pubs.usgs.gov/circ/c1075/change.html
  • National Park Service, Sand Fencing https://www.nps.gov/articles/sand-fencing.htm
  • U.S. Geological Survey, Coastal Sediment Availability and Flux Capabilities https://www.usgs.gov/science/coastal-sediment-availability-and-flux-csaf-capabilities

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

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