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These bars usually consist of accumulated gravel and sand carried by the current of longshore drift and deposited at a less turbulent part of the current. Thus, they most commonly occur across artificial bay and river entrances due to the loss of kinetic energy in the current after wave refraction.
Sand Bypass Systems
In most cases, a Sand Bypass System is built to prevent these bars forming across the entrance of human-made seaways, eliminating the danger to commercial and recreational boats passing through.
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