The excess sand is washed back to water depths by waves and currents, causing the beach to lose the fresh sand over the next year or so.
Sand is moved by waves and currents. To make up for this, we'll have to move a lot of sand. Building beaches from extracted sand can work, but the sand quickly returns to deep water, so the activity must usually be reiterated every year or every few decades to keep the beaches large and sandy.
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