Browsing Brage IMR by Author "Khodabandeloo, Babak"
Now showing items 1-8 of 8
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Application of an unsupervised clustering algorithm on in situ broadband acoustic data to identify different mesopelagic target types
Agersted, Mette Dalgaard; Khodabandeloo, Babak; Liu, Yi; Melle, Webjørn Raunsgård; Klevjer, Thor Aleksander (Peer reviewed; Journal article, 2021)The mesopelagic zone (200–1000 m depth) contains high fish species diversity but biomass and abundances are uncertain yet essential to understand ecosystem functioning. Hull-mounted acoustic systems (usually 38 kHz) often ... -
CRIMAC cruise report: Development of acoustic and optic methods for underwater target calssification - G.O. Sars 22.11 - 03.12 2022
Handegard, Nils Olav; Tenningen, Maria; Bildøy, Leif; Corneliussen, Jon Even; Esmail, Kameran; Heinsdorf, Jens; Khodabandeloo, Babak; Korneliussen, Rolf; Kubilius, Rokas; Kvalvik, Liz Beate Kolstad; Osborg, Eirik Svoren; Pala, Ahmed; Pedersen, Geir; Rosen, Shale; Saltskår, Jostein; Schuster, Erik; Ulset, Ingrid; Westergerling, Eugenie Heliana Taraneh (Toktrapport;2023 - 3, Research report, 2023)The overarching objective of the survey is to collect data to support the CRIMAC activities and to collect data for the LoVe observatory. CRIMAC is a center of research-based innovation funded by the research council of ... -
Estimating target strength and physical characteristics of gas-bearing mesopelagic fish from wideband in situ echoes using a viscous-elastic scattering model
Khodabandeloo, Babak; Agersted, Mette Dalgaard; Klevjer, Thor Aleksander; Macaulay, Gavin John; Melle, Webjørn Raunsgård (Peer reviewed; Journal article, 2021)Wideband (38 and 50–260 kHz) target strength of organisms were measured in situ using a towed platform in mesopelagic (200–1000 m depth) layers. Organisms with a gas-inclusion are strong scatterers of sound and acoustically ... -
Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling
Agersted, Mette Dalgaard; Khodabandeloo, Babak; Klevjer, Thor A.; García-Seoane, Eva; Strand, Espen; Underwood, Melanie; Melle, Webjørn Raunsgård (Peer reviewed; Journal article, 2021)A new acoustic approach to estimate the mass of individual gas-bearing fish at their resident depth at more than 400 m was tested on Cyclothone spp.. Cyclothone are small and slender, and possibly numerically underestimated ... -
Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements
Khodabandeloo, Babak; Ona, Egil; Pedersen, Geir; Korneliussen, Rolf; Melle, Webjørn Raunsgård; Klevjer, Thor Aleksander (Peer reviewed; Journal article, 2022)Backscattered acoustic energy from a target varies with frequency and carries information about its material properties, size, shape, and orientation. Gas-bearing organisms are strong reflectors of acoustic energy at the ... -
Mesopelagic flesh shear viscosity estimation from in situ broadband backscattering measurements by a viscous–elastic model inversion
Khodabandeloo, Babak; Agersted, Mette Dalgaard; Klevjer, Thor A.; Pedersen, Geir; Melle, Webjørn Raunsgård (Peer reviewed; Journal article, 2021)In fisheries acoustics, target strength (TS) is a key parameter in converting acoustic measurements to biological information such as biomass. Modelling is a versatile tool to estimate TS of marine organisms. For swimbladdered ... -
Nonlinear crosstalk in broadband multi-channel echosounders
Khodabandeloo, Babak; Ona, Egil; Macaulay, Gavin; Korneliussen, Rolf (Peer reviewed; Journal article, 2021)Distortion of acoustic wave caused by nonlinear propagation transfers acoustic energy into higher harmonics of the transmitted signal. When operating several broadband echosounders with non-overlapping frequency bands to ... -
Survey report for testing a sparker sound source on cod behavior (SpawnSeis Sparker) - Cruise report 2023200035
Sivle, Lise Doksæter; McQueen, Kate; Khodabandeloo, Babak (Toktrapport;2024 - 16, Research report, 2024)The SpawnSeis project aims at studying the behaviour of free-living cod to different sources of antropogenic sound, and previous experiments have been conducted with seismic air guns and a marine vibrator. This study test ...