Underwater noise levels of pile-driving in a New Zealand harbour, and the potential impacts on endangered Hector's dolphins.
Mar Pollut Bull
; 135: 195-204, 2018 Oct.
Article
em En
| MEDLINE
| ID: mdl-30301031
ABSTRACT
Impact pile-driving generates loud underwater anthropogenic sounds, and is routinely conducted in harbours around the world. Surprisingly few studies of these sounds and their propagation are published in the primary literature. To partially redress this we studied pile-driving sounds in Lyttelton Harbour, New Zealand, during wharf reconstruction after earthquake damage. That Lyttelton harbour is routinely used by Hector's dolphins (Cephalorhynchus hectori), an endangered species found only in New Zealand, provided further context for this study. Steel piles of 0.61 or 0.71â¯m diameter were driven using three different pile-drivers. Maximum calculated source SEL was 192â¯dB re 1⯵Pa2s @ 1â¯m (SPL0-p of 213â¯dB re 1⯵Pa @ 1â¯m). Propagation of piling noise was strongly influenced by harbour bathymetry and a rock breakwater near the piling operation. We calculated range estimates at which Hector's dolphins may suffer temporary hearing threshold shift and behavioural change.
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Ano de publicação:
2018
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Article