Measuring underwater background noise in high tidal flow environments

Willis, M.R.; Broudic, Merin; Haywood, Charlotte; Masters, Ian; Thomas, S. Y. Choong

doi:10.1016/j.renene.2012.01.020

Cited by 16 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tidal bore produces substantial sound energy, with noise levels between 72 and 108 dB RMS. Most noise was found below 100 Hz, with a major peak at 10 Hz (Willis et al ). Boat traffic adds energy at slightly higher frequencies, around 100 Hz, but substantial lower frequency (4–70 Hz) energy is related to propeller‐excited hull resonance and propeller blade noise (Collier ).…”

Section: Discussionmentioning

confidence: 99%

Signals and noise in the octavolateralis systems: What is the impact of human activities on fish sensory function?

Braun

2015

Integrative Zoology

View full text Add to dashboard Cite

The octavolateralis systems of fishes include the vestibular, auditory, lateral line and electrosensory systems. They are united by common developmental and neuro-computational features, including hair cell sensors and computations based on cross-neuron analyses of differential hair cell stimulation patterns. These systems also all use both spectral and temporal filters to separate signals from each other and from noise, and the distributed senses (lateral line and electroreception) add spatial filters as well. Like all sensory systems, these sensors must provide the animal with guidance for adaptive behavior within a sensory scene composed of multiple stimuli and varying levels of ambient noise, including that created by human activities. In the extreme, anthropogenic activities impact the octavolateralis systems by destroying or degrading the habitats that provide ecological resources and sensory inputs. At slightly lesser levels of effect, anthropogenic pollutants can be damaging to fish tissues, with sensory organs often the most vulnerable. The exposed sensory cells of the lateral line and electrosensory systems are especially sensitive to aquatic pollution. At still lesser levels of impact, anthropogenic activities can act as both acute and chronic stressors, activating hormonal changes that may affect behavioral and sensory function. Finally, human activities are now a nearly ubiquitous presence in aquatic habitats, often with no obvious effects on the animals exposed to them. Ship noise, indigenous and industrial fishing techniques, and all the ancillary noises of human civilization form a major part of the soundscape of fishes. How fish use these new sources of information about their habitat is a new and burgeoning field of study.

show abstract

Section: Discussionmentioning

confidence: 99%

Signals and noise in the octavolateralis systems: What is the impact of human activities on fish sensory function?

Braun

2015

Integrative Zoology

View full text Add to dashboard Cite

show abstract

“…A hydrophone at a static position in high current flow is subject to unwanted noise sources such as flow noise, swell noise, cable flutter [7]. In order to reduce and/or avoid these unwanted noises, the team has adopted the "drifting methodology" [8]. This methodology consists of positioning the 7 m RIB (Rigid Inflatable Boat) upstream at a specific location.…”

Section: Field Measurementsmentioning

confidence: 99%

Comparison of underwater background noise during Spring and Neap tide in a high tidal current site: Ramsey Sound

Broudic¹,

Croft²,

Willis³

et al. 2014

Proceedings of Meetings on Acoustics

Self Cite

View full text Add to dashboard Cite

“…Underwater ambient noise in the ocean exhibits very different patterns in response to shipping, wind, marine life, breaking waves, rainfall, and water flow [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Generally, underwater ambient noise caused by water flow in the ocean is generated at frequencies below 100 Hz [6,9,10,12,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Such underwater noise is frequently called flow noise or pseudosound, a type of non-acoustic noise [6,7,11], as water flow can cause pressure fluctuations near the surface of the moored underwater hydrophone in the ocean. However, flow noise can be an important factor when investigating the characteristics of tides [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on flow noise in the ocean caused by tides have mostly investigated the relationship between sea level and flow velocity [16][17][18]. These studies have shown that significant flow noise at 4.5 Hz can be observed due to semi-diurnal tides, and flow Previous studies on flow noise in the ocean caused by tides have mostly investigated the relationship between sea level and flow velocity [16][17][18]. These studies have shown that significant flow noise at 4.5 Hz can be observed due to semi-diurnal tides, and flow noise can occur at frequencies of up to 500 Hz as tidal current velocity increases [16,17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Correlation between Underwater Noise and Sea Level at Ieodo Ocean Research Station

Kim

Choi

Kim

2020

JMSE

View full text Add to dashboard Cite

To investigate the correlation between underwater noise and sea level, data collected at Ieodo Ocean Research Station (from 15 May to 27 August 2013) were analyzed. Temporal variations in the overall level of underwater noise were similar to those in sea level. The average underwater noise levels at frequencies below 50 Hz were 99.0–106.6 dB during spring tides and 78.4–90.2 dB during neap tides, with a difference of 12.6–20.6 dB. When low-pass filtering at six hours was applied to the absolute value of sea level, a high correlation coefficient of 0.7 for its association with underwater noise was obtained. This strong correlation could indicate flow noise caused by currents. Underwater noise levels around the frequency of 16 Hz were relatively strongly correlated with sea level (correlation coefficient of 0.71). Wavelet analysis of the overall level of underwater noise showed strong periodicity at 0.25, 0.50, 1.0, 16.0, and 30.0 days, as well as characteristics of a tidal constituent. In wavelet coherence analysis, the overall level at a period of 0.25 days exhibited a phase difference of −90 degrees relative to sea level. This finding indicates that the noise level peaks at 1.5 h before the high tide or low tide, which was confirmed in the correlation analysis of noise level and sea height with various time lags. This study shows that the overall level of underwater noise from ebb currents is higher than that from flood currents due to differences in current velocity.

show abstract

Measuring underwater background noise in high tidal flow environments

Cited by 16 publications

References 3 publications

Signals and noise in the octavolateralis systems: What is the impact of human activities on fish sensory function?

Signals and noise in the octavolateralis systems: What is the impact of human activities on fish sensory function?

Comparison of underwater background noise during Spring and Neap tide in a high tidal current site: Ramsey Sound

Correlation between Underwater Noise and Sea Level at Ieodo Ocean Research Station

Contact Info

Product

Resources

About