Littoral Drift

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Littoral Drift (English)
沿岸漂砂
Deriva litoral
Dérive littorale

Sand and coarser material moved in the breaker and swash zones by waves and longshore currents along the shoreline.

For an in-depth understanding of how beaches form and change, watch the 20-minute video The Beach - A River of Sand (1965) which was made by Doug Inman, a marine geologist at Scripps Institution of Oceanography.