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Performance of a Submerged Reef – A Physical Model Study

Kiran G. Shirlal, Subba Rao, Manu

Abstract


Ocean waves can be destructive as steeper waves, due to their high energy, erode the sandy beaches. If these waves are made to break prematurely and away from the beach and attenuate them, then, beach erosion could be reduced. This can be economically accomplished by a submerged reef suitably designed and constructed at some distance offshore. This paper experimentally investigates the armour stone stability of the submerged reef and influence of its varying distance from shore on ocean wave transmission. A stability equation for a submerged reef has been obtained. It is found that a 0.25m (7.5m) high reef, having a crest width of 0.1m (3.0m) and of constructed with an optimum armour of weight of 30gms (0.81Ton) at a seaward distance of 4m (120m) in a water depth up to 0.4m (12m) can achieve a wave transmission of 51% for the test wave conditions.

Keywords


Reef, Stability, Wave breaking, Wave Transmission, Wave height attenuation, Energy dissipation, Coastal protection

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