Bio- and Fishery Acoustics

Blondel, Philippe

doi:10.1016/b978-0-12-811240-3.00012-6

Cited by 3 publications

(2 citation statements)

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“…These habitats are critical for the health of the sea bottom by serving as excellent feeding grounds for many fish and crustaceans as well as by regulating carbon production (Martin et al, 2013). While there is sufficient research on species of coralligenous formations around the Mediterranean (Ballesteros, 2006;Blondel et al, 2006;Bartlett et al, 2009;Bonacorsi et al, 2012;Giakoumi et al, 2013;Martin et al, 2014;Ingrassia et al, 2019;Pierdomenico et al, 2021;Romagnoli et al, 2021;De Falco et al, 2022), only one systematic study (Georgiadis et al, 2009) refers to the Eastern Mediterranean region. Coralligenous formations are under heavy stress due to human activities such as fishing, anchoring, invasion of alien species, and environmental pollution (Georgiadis et al, 2009;Coll et al, 2012;Giakoumi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Improved predictive modelling of coralligenous formations in the Greek Seas incorporating large-scale, presence–absence, hydroacoustic data and oceanographic variables

et al. 2023

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Our understanding of the distribution of coralligenous formations, throughout but mostly on the Eastern Mediterranean seafloor, is still poor and mostly relies on presence-only opportunistic trawling and fishermen reports. Previous efforts to gather this information created relevant geodatabases that led to a first draft predictive spatial distribution of coralligenous formations in the Mediterranean Sea using habitat suitability modelling techniques. In the last few decades, the use of hydroacoustics to map the seafloor for various geotechnical and habitat mapping projects accumulated high amounts of detailed spatial information about these formations, which remains majorly unexploited. Repurposing these datasets towards mapping key habitats is a valuable stepping stone to implementing the EU Habitat Directive. In Greece, a unique volume of seafloor mapping data has been gathered by the Laboratory of Marine Geology and Physical Oceanography, Geology Department, University of Patras. It accounts for more than 33 marine geophysical expeditions during the last three decades, having collected hydroacoustic data for a total seafloor area of 3,197.68 km2. In the present work, this information has been curated, re-evaluated, and archived to create the most complete, until now, atlas of coralligenous formations in the Greek Seas and the only integrating presence–absence data. This atlas has been used to train and validate a predictive distribution model, incorporating environmental variables derived from open data repositories, whose importance has been assessed and discussed. The final output is an improved probability map of coralligenous formation occurrence in the Greek Seas, which shall be the basis for effective spatial planning, gap detection, and design of future mapping and monitoring activities on this priority habitat.

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Section: Introductionmentioning

confidence: 99%

Improved predictive modelling of coralligenous formations in the Greek Seas incorporating large-scale, presence–absence, hydroacoustic data and oceanographic variables

et al. 2023

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“…and bioacoustics (How does marine life use sound?) are closely connected domains [1]. The fishery acoustics discipline covers a wide range of research and practical application topics using acoustical devices as sensors in aquatic and ocean environments [2].…”

Section: Introductionmentioning

confidence: 99%

Editorial for Special Issue: Fishery Acoustics, Applied Sciences, and Practical Applications

Kim

Shevlyakov

et al. 2019

Applied Sciences

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Underwater channel estimation exploiting multipath feature morphology

McCarthy

Gupta

2021

The Journal of the Acoustical Society of America

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Real-time accurate channel estimation has been an ongoing challenge because of diverse oceanic events that cause rapid fluctuations of high-energy multipath activity across the delay spread. This work leverages current compressed sensing and sparse optimization techniques with topological signal processing to improve estimation time and localize channel estimation to salient parts of the delay spread. This work improves the estimation time by tracking the channel as a union of overlapping multipath and other scattering events, which are modeled as “feature braids” in the delay-time domain. A channel feature braid may be intuitively visualized as the topologically connected trajectory of a group of channel delay taps, which represent the support of dominant or persistent scattering events, e.g., surface bounce multipath scattering. We present algorithms that harness support-constrained mixed norm optimization techniques to track the evolving support of channel feature braids. We validate our channel feature tracking algorithm independently in experimental field data as well as BELLHOP channel simulations across a diversity of oceanic conditions. This work shows that braiding used in estimation can improve estimation time and track high-energy events that develop within the delay vs time channel representation.

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Bio- and Fishery Acoustics

Cited by 3 publications

References 76 publications

Improved predictive modelling of coralligenous formations in the Greek Seas incorporating large-scale, presence–absence, hydroacoustic data and oceanographic variables

Improved predictive modelling of coralligenous formations in the Greek Seas incorporating large-scale, presence–absence, hydroacoustic data and oceanographic variables

Editorial for Special Issue: Fishery Acoustics, Applied Sciences, and Practical Applications

Underwater channel estimation exploiting multipath feature morphology

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