Questions tagged [water]

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5 votes
2 answers
130 views

What is the order of magnitude of water-wave pressure as compared to that of a typical animal communication sound?

Ideal water waves are surface mechanical waves which are ruled by wind (disturbing force) and gravity (restoring force): CC BY-NC-ND This work by Dan Russell is licensed under a Creative Commons ...
Noil's user avatar
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8 votes
2 answers
61 views

Is there any sound repelent/attractant to help rescuing a Beluga who got lost in a river far from the sea?

I've seen in the news that a live Beluga whale has been identified in a French river (Seine, very busy and polluted, >150 km from the sea), which is particularly rare as no Beluga has been seen ...
Noil's user avatar
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8 votes
2 answers
231 views

Are "acoustic waves" the same as "mechanical waves"?

In my physics program, “acoustics” was referring to any mechanical waves that use local compression/rarefaction of medium particles to propagate, whatever the propagating medium (gas, liquid, solid). ...
Noil's user avatar
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5 votes
1 answer
44 views

Many time Hydrophone recording consist of Chain noise at regular interval. How to minimize this unintended sounds?

I was analyzing some marine data from the Red sea. I found some sound structures which didn't look like any biophony. When I listen to this sound, it looked like some chain noise. since I didn't have ...
Sougata Sadhukhan's user avatar
9 votes
1 answer
87 views

Mystery Marine Animal Sound off Georgia USA in Western Atlantic

I am trying to learn the source of the sound in the spectrogram below. It has been recorded in early to late winter (January/February) on the shelf (25 m depth) off the US state of Georgia in the ...
TJ Rowell's user avatar
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6 votes
1 answer
93 views

Low cost hydrophones for quantitative sound pressure measurements?

Has anyone experience with using low-cost hydrophones, for example the Acquarian Audio H2a, and use a calibration measurements, for example by comparing to a Brüel Kjaer 8106, to get quantitative ...
Jörg Rychen's user avatar
18 votes
6 answers
2k views

How to reduce the unwanted wave noise in Hydrophone recordings?

Many times hydrophone recording contains unwanted noise like 'wave noise'. How to deal with this noise at the source? Is there any way to deal with this in the analysis stage? as abrupt noise impacts ...
Sougata Sadhukhan's user avatar
9 votes
1 answer
60 views

What contributes to differences in click structure for populations of the same species?

I am examining the case of Pacific White-sided Dolphins as an example. Reading Melissa Soldvevilla's 2017 paper sparked my interest in this topic. In the paper, 'Geographic variation in Risso’s ...
Alexandra Fiske's user avatar
13 votes
2 answers
64 views

Distant impact on sea mammals of propagated sound wave of underwater nuclear tests

Nuclear tests have obvious effects on life and habitats by physical destructions and irridiations. This has been widespread between the 50s and 80s, mostly from the USA (1054 tests incl. 835 ...
Noil's user avatar
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15 votes
2 answers
101 views

How much do the sea-wave sounds interfere with acoustic communication in sea animals?

During storm / bad weather, sea waves produce powerful acoustic energy. In sea animals which use sounds to communicate, is there any studies about how they cope with this? As any species in a given ...
Noil's user avatar
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20 votes
3 answers
177 views

What are the main differences in recording solid-borne, water-borne and air-borne sounds?

Bioacoustics is the study of how animals communicates with any acoustic waves. Strickly speaking, it involves any substrates where the acoustic waves propagate: liquids (water), gas (air) and solids (...
Noil's user avatar
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9 votes
2 answers
99 views

What are the tools available for freshwater acoustic monitoring?

Recording in freshwater is getting more popular and people usually use a handheld recorder and hydrophone for focal recordings. How about passive acoustic monitoring? There used to be a possibility to ...
Cam Desjonqu's user avatar
13 votes
2 answers
148 views

Why does sound from ships propagate better in deep water than in shallow water?

I saw the following graph in a blog post about how shipping noise affects whales. Why does the sound seem to propagate better in deep water than in shallow water? Are there any known marine species ...
416E64726577's user avatar