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Monitoring underwater explosions in the habitat of resident bottlenose dolphins
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Resumo(s)
Maintenance work on the harbor of Setu´bal, in Portugal, required the removal of a 14-m deep rocky
outcrop at the ship maneuver area, using about 35 kg of Gelamonite, a nitroglycerin-based highexplosive.
This important harbor is located in the Sado estuary, a biologically rich environment and
an important feeding area for a resident community of bottlenose dolphins. Using different safe
range calculation models, a mitigation and monitoring plan was developed that minimized the risks
of these underwater explosions for the dolphins. At our monitoring station, at 2 km from the demolition
site, acoustic pressure levels in excess of 170 dB re 1 lPa (root-mean-square) were measured.
Samples of dead fish collected at the site were indicative of shock trauma from the blasts.
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Citação
Journal of the Acoustical Society of America, 128 (3), 3805-3808