Radiated underwater noise levels of two research vessels, evaluated at different acoustic ranges in deep and shallow water

2012 ◽  
Author(s):  
Anton Homm ◽  
Stefan Schäl
Keyword(s):  
Shallow Water ◽  
Underwater Noise ◽  
Noise Levels

scholarly journals Measurement of small vessel machinery vibration induced acoustic signature levels

2019 ◽  
Vol 16 (2) ◽  
pp. 87-98 ◽  
Author(s):  
GVV Pavan Kumar ◽  
V V S Prasad ◽  
B H Nagesh
Keyword(s):  
Pressure Fluctuations ◽  
Response Spectra ◽  
Underwater Sound ◽  
Underwater Noise ◽  
Noise Levels ◽  
Small Vessels ◽  
Performance Point ◽  
Engine Room ◽  
Airborne Noise ◽  
Main Engine

Ship vibrations, airborne and underwater noise levels have always been a challenging topic from a performance point of view in ship design, building and operation. The measurement shall help in monitoring the self-noise and the technical state of their machinery mechanism. The vibration levels on the main engine and auxiliary Genset foundation, airborne noise levels of the engine room and underwater self-noise levels of a small mechanized fishing trawler was measured at the jetty in idling condition.  The vibration levels on the foundation measured the average value of 0.207 mm/s for the main engine and 1.36 mm/s for auxiliary Genset. The airborne noise levels measured 99 dB (A) in the engine room. The peak underwater sound pressure levels measured 162 dB re 1µPa. The response spectra indicate the peak vibration and noise levels in the lower frequency region <1.2 kHz. The machinery excitation forces transferred to the hull surface as pressure fluctuations which generated the airborne and underwater noise levels. Though the measurement limited to jetty conditions, detailed analysis can be useful for detection, classification, and tracking of small vessels.

Towards a standard for the measurement of underwater noise from impact pile driving in shallow water

2014 ◽  
Vol 136 (4) ◽  
pp. 2216-2216
Author(s):  
Peter H. Dahl ◽  
Pete D. Theobald ◽  
Stephen P. Robinson
Keyword(s):  
Shallow Water ◽  
Pile Driving ◽  
Underwater Noise

Detection of long term trends in underwater noise levels

2016 ◽  
Vol 140 (4) ◽  
pp. 3024-3024
Author(s):  
Claire F. Powell ◽  
Nathan D. Merchant
Keyword(s):  
Underwater Noise ◽  
Noise Levels ◽  
Long Term Trends

Effect of Rain upon Underwater Noise Levels

1955 ◽  
Vol 27 (2) ◽  
pp. 378-379 ◽  
Author(s):  
T. E. Heindsmann ◽  
R. H. Smith ◽  
A. D. Arneson
Keyword(s):  
Underwater Noise ◽  
Noise Levels

scholarly journals Soundscape and ambient noise levels of the Arctic waters around Greenland

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Michael Ladegaard ◽  
Jamie Macauley ◽  
Malene Simon ◽  
Kristin L. Laidre ◽  
Aleksandrina Mitseva ◽  
...  
Keyword(s):  
Ambient Noise ◽  
Anthropogenic Activities ◽  
Open Water ◽  
Anthropogenic Sources ◽  
The Arctic ◽  
Underwater Noise ◽  
Noise Levels ◽  
Greenland Sea ◽  
Mammal Species ◽  
Seismic Surveys

AbstractA longer Arctic open water season is expected to increase underwater noise levels due to anthropogenic activities such as shipping, seismic surveys, sonar, and construction. Many Arctic marine mammal species depend on sound for communication, navigation, and foraging, therefore quantifying underwater noise levels is critical for documenting change and providing input to management and legislation. Here we present long-term underwater sound recordings from 26 deployments around Greenland from 2011 to 2020. Ambient noise was analysed in third octave and decade bands and further investigated using generic detectors searching for tonal and transient sounds. Ambient noise levels partly overlap with previous Arctic observations, however we report much lower noise levels than previously documented, specifically for Melville Bay and the Greenland Sea. Consistent seasonal noise patterns occur in Melville Bay, Baffin Bay and Greenland Sea, with noise levels peaking in late summer and autumn correlating with open water periods and seismic surveys. These three regions also had similar tonal detection patterns that peaked in May/June, likely due to bearded seal vocalisations. Biological activity was more readily identified using detectors rather than band levels. We encourage additional research to quantify proportional noise contributions from geophysical, biological, and anthropogenic sources in Arctic waters.

Assessment of the proportion of anthropogenic underwater noise levels in passive acoustic monitoring

2017 ◽  
Vol 142 (4) ◽  
pp. 2685-2685
Author(s):  
Mirko Mustonen ◽  
Aleksander Klauson ◽  
Mihkel Tommingas ◽  
Julia Berdnikova
Keyword(s):  
Acoustic Monitoring ◽  
Underwater Noise ◽  
Noise Levels ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic
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