Relationship between container ship underwater noise levels and ship design, operational and oceanographic conditions

TitleRelationship between container ship underwater noise levels and ship design, operational and oceanographic conditions
Publication TypeJournal Article
Year of Publication2013
AuthorsMcKenna MF, Wiggins SM, Hildebrand JA
JournalScientific Reports
Volume3
Date Published2013/04
Type of ArticleArticle
ISBN Number2045-2322
Accession NumberWOS:000318242000002
Keywordsambient noise; california; commercial ships; increases; ocean; radiated noise; right whales; spectra
Abstract

Low-frequency ocean ambient noise is dominated by noise from commercial ships, yet understanding how individual ships contribute deserves further investigation. This study develops and evaluates statistical models of container ship noise in relation to design characteristics, operational conditions, and oceanographic settings. Five-hundred ship passages and nineteen covariates were used to build generalized additive models. Opportunistic acoustic measurements of ships transiting offshore California were collected using seafloor acoustic recorders. A 5-10 dB range in broadband source level was found for ships depending on the transit conditions. For a ship recorded multiple times traveling at different speeds, cumulative noise was lowest at 8 knots, 65% reduction in operational speed. Models with highest predictive power, in order of selection, included ship speed, size, and time of year. Uncertainty in source depth and propagation affected model fit. These results provide insight on the conditions that produce higher levels of underwater noise from container ships.

DOI10.1038/srep01760
Short TitleSci Rep
sharknado