Good afternoon everyone,
I'm planning on studying and comparing the amount of underwater "noise" in different areas, and later, potentially, linked it with marine mammals occupancy. However I was wondering, what is the most suitable way to do it? Would it be by doing transects and dragging a hydrophone behind a sailing boat, or by submerging a few at different locations? What would be the advantages or disadvantages of both methods?
We would like to sample these oceanic sounds at three different times as well.
Thank you in advance!
G.M.
Bonjour Grégoire,
surtout mettez vos hydrophones à poste fixe, dans une zone aussi profonde que possible, en échantillonnant toute la colonne d'eau... Utiliser des bouées acoustiques large-bande est peut-être une option possible ? Mais avez vous une bande de fréquences particulièrement ciblée ? Car vous n'arriverez pas à couvrir le spectre de quelques Hz à une centaine de kHz avec les mêmes capteurs ! Appelez moi si vous voulez au 06 8290 0915... B Garnier, ex-directeur technique à Thales Underwater Systems
From the point of getting good quality data, a submerged array of hydrophones is a better solution. I can refer to the practice of existed acoustic observatories, for example, Australian: https://imos.org.au/facilities/nationalmooringnetwork/acousticobservatories
But if you need to cover a large area and enjoy sailing, probably, a sailboat is a better solution:)
The best solution is to use profiling floats, equipped with hydrophones, you can read about it here: Article Tracking beaked whales with a passive acoustic profiler float
Good luck!
Towing is not advisable if you can avoid it due to costly ship/boat time, bad weather, and especially flow noise on hydrophones.
There are many commercial battery-powered buoys in wide use that can log underwater acoustic data for months. Check out the AMAR buoys at JASCO Canada for instance, which I think may include marine mammal call recognition software (https://www.jasco.com/amar-g4-specifications).
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