Underwater acoustic environment of coastal sea with heavy shipping traffic : NE Baltic Sea during wintertime implementation

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http://hdl.handle.net/10138/335758

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Syrjälä J, Kalliola R and Pajala J (2020) Underwater Acoustic Environment of Coastal Sea With Heavy Shipping Traffic: NE Baltic Sea During Wintertime. Front. Mar. Sci. 7:589141. doi: 10.3389/fmars.2020.589141

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Title: Underwater acoustic environment of coastal sea with heavy shipping traffic : NE Baltic Sea during wintertime implementation
Author: Syrjälä, Joonas; Kalliola, Risto; Pajala, Jukka
Publisher: Frontiers Social Media
Date: 2020
Language: en
Belongs to series: Frontiers in Marine Science, 12 (2020)
ISSN: 2296-7745
DOI: https://doi.org/10.3389/fmars.2020.589141
URI: http://hdl.handle.net/10138/335758
Abstract: Shipping is the most pervasive source of anthropogenic underwater continuous noise and local intermittent noise. This study focused on the separation of anthropogenic intermittent noise from dynamic background noise in the Gulf of Finland using an adaptive threshold level (ATL) technique. The intermittent noise was validated with Automatic Identification System (AIS) data and the background noise with selected environmental factors. Separated components were characterized and compared with a sound exposure level (SEL) in three 1/3 octave bands. Intermittent noise can be separated with ATL in the Baltic Sea, and vessel traffic identified as the primary source. Background noise varies spatially and is partially explained by environmental factors. Intermittent noise has strong persisting influence on the acoustic environment near shipping lanes, elevating the SEL in each of the 1/3 octave bands: by 20–30 dB in the 63 Hz band, by 13–22 dB in the 125 Hz band and by 5–8 dB in the 2000 Hz band. We conclude that strong intermittent noise is characteristic to the underwater acoustic environment in the study area with heavy shipping traffic. By combining ATL with data from AIS, intermittent noise peaks in underwater hydrophone recordings can be associated with passages of individual vessels.
Subject: underwater noise
shipping
AIS
adaptive threshold level
Baltic Sea
intermittent noise
noise threshold
underwater
acoustic
acoustic environment
noise
underwater noise
anthropogenic underwater noise
local intermittent noise
dynamic background noise
sea
coastal sea
shipping traffic
heavy shipping traffic
vessel traffic
winter
wintertime
automatic identification system
sound exposure level
SEL
hydrophone recording
Baltic Sea
Gulf of Finland
Subject (ysa): vedenalainen melu
laivaus
mukautuva kynnystaso
itämeri
ajoittainen melu
melukynnys
vedenalainen
akustiikka
akustinen ympäristö
melu
vedenalainen melu
dynaaminen taustamelu
rannikko
rannikkomeri
laivausliikenne
raskas laivausliikenne
laivaliikenne
raskas laivaliikenne
talvi
talviaika
AIS-järjestelmä
alusten automaattinen tunnistusjärjestelmä
äänialtistustaso
hydrofoni
hydrofoninen äänitys
Itämeri
Suomenlahti
Rights: This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.


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