Polhena coral reef wave attenuation: breaking mechanics and coastal protection barriers?
3 Answers from travellers
Polhena Bay is sheltered by a shallow offshore barrier reef composed of massive Porites boulders and branching Acropora thickets. As deep-water Indian Ocean groundswells approach the coast, they encounter the steep reef crest, forcing waves to break prematurely and dissipate up to 85% of their kinetic wave energy across the rough reef flat. This natural wave attenuation creates a tranquil, protected swimming lagoon behind the reef, shielding coastal residential structures and sandy pocket beaches from severe monsoonal erosion.
Walking across the reef flat at low tide damages fragile branching corals and exposes bathers to sharp urchin spines; swimming is safest in high tide channels.
Marine conservation groups maintain artificial concrete reef ball nurseries in the inner bay to supplement natural wave-break protection.
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