743 research outputs found
Acoustic Transmitters for Underwater Neutrino Telescopes
No full textIn this paper acoustic transmitters that were developed for use in underwater neutrino telescopes are presented. Firstly, an acoustic transceiver has been developed as part of the acoustic positioning system of neutrino telescopes. These infrastructures are not completely rigid and require a positioning system in order to monitor the position of the optical sensors which move due to sea currents. To guarantee a reliable and versatile system, the transceiver has the requirements of reduced cost, low power consumption, high pressure withstanding (up to 500 bars), high intensity for emission, low intrinsic noise, arbitrary signals for emission and the capacity of acquiring and processing received signals. Secondly, a compact acoustic transmitter array has been developed for the calibration of acoustic neutrino detection systems. The array is able to mimic the signature of ultra-high-energy neutrino interaction in emission directivity and signal shape. The technique of parametric acoustic sources has been used to achieve the proposed aim. The developed compact array has practical features such as easy manageability and operation. The prototype designs and the results of different tests are described. The techniques applied for these two acoustic systems are so powerful and versatile that may be of interest in other marine applications using acoustic transmitters. © 2012 by the authors; licensee MDPI, Basel, Switzerland.This work has been supported by the Ministerio de Ciencia e Innovacion (Spanish Government), project references FPA2009-13983-C02-02, ACI2009-1067, AIC10-D-00583, Consolider-Ingenio Multidark (CSD2009-00064). Authors Manuel Bou-Cabo and Silvia Adrian-Martinez thank Multidark for the fellowships. The work has also been funded by Generalitat Valenciana, Prometeo/2009/26, and the European 7th Framework Programme, Grant No. 212525.Ardid Ramírez, M.; Martínez Mora, JA.; Bou Cabo, M.; Larosa ., G.; Adrián Martínez, S.; Llorens Alvarez, CD. (2012). Acoustic Transmitters for Underwater Neutrino Telescopes. Sensors. 12(4):4113-4132. https://doi.org/10.3390/s120404113S41134132124Ardid, M. (2009). Positioning system of the ANTARES neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 602(1), 174-176. doi:10.1016/j.nima.2008.12.033Askariyan, G. A., Dolgoshein, B. A., Kalinovsky, A. N., & Mokhov, N. V. (1979). Acoustic detection of high energy particle showers in water. Nuclear Instruments and Methods, 164(2), 267-278. doi:10.1016/0029-554x(79)90244-1Ageron, M., Aguilar, J. A., Al Samarai, I., Albert, A., Ameli, F., André, M., … Ardid, M. (2011). ANTARES: The first undersea neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 656(1), 11-38. doi:10.1016/j.nima.2011.06.103www.km3net.orgAguilar, J. A., Al Samarai, I., Albert, A., André, M., Anghinolfi, M., Anton, G., … Astraatmadja, T. (2011). Time calibration of the ANTARES neutrino telescope. Astroparticle Physics, 34(7), 539-549. doi:10.1016/j.astropartphys.2010.12.004Bevan, S., Brown, A., Danaher, S., Perkin, J., Rhodes, C., Sloan, T., … Waters, D. (2009). Study of the acoustic signature of UHE neutrino interactions in water and ice. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 607(2), 398-411. doi:10.1016/j.nima.2009.05.009Aguilar, J. A., Al Samarai, I., Albert, A., Anghinolfi, M., Anton, G., Anvar, S., … Aubert, J.-J. (2011). AMADEUS—The acoustic neutrino detection test system of the ANTARES deep-sea neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 626-627, 128-143. doi:10.1016/j.nima.2010.09.053Ardid, M. (2009). Calibration in acoustic detection of neutrinos. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 604(1-2), S203-S207. doi:10.1016/j.nima.2009.03.071Ardid, M., Bou-Cabo, M., Camarena, F., Espinosa, V., Larosa, G., Llorens, C. D., & Martínez-Mora, J. A. (2010). A prototype for the acoustic triangulation system of the KM3NeT deep sea neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 617(1-3), 459-461. doi:10.1016/j.nima.2009.10.110Llorens, C. D., Ardid, M., Sogorb, T., Bou-Cabo, M., Martínez-Mora, J. A., Larosa, G., & Adrián-Martínez, S. (2012). The sound emission board of the KM3NeT acoustic positioning system. Journal of Instrumentation, 7(01), C01001-C01001. doi:10.1088/1748-0221/7/01/c01001Simeone, F., Ameli, F., Ardid, M., Bertin, V., Bonori, M., Bou-Cabo, M., … Viola, S. (2012). Design and first tests of an acoustic positioning and detection system for KM3NeT. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 662, S246-S248. doi:10.1016/j.nima.2010.11.137Westervelt, P. J. (1963). Parametric Acoustic Array. The Journal of the Acoustical Society of America, 35(4), 535-537. doi:10.1121/1.1918525Moffett, M. B., & Mello, P. (1979). Parametric acoustic sources of transient signals. The Journal of the Acoustical Society of America, 66(4), 1182-1187. doi:10.1121/1.383312Ardid, M., Bou-Cabo, M., Camarena, F., Espinosa, V., Larosa, G., Martínez-Mora, J. A., & Ferri, M. (2009). Use of parametric acoustic sources to generate neutrino-like signals. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 604(1-2), S208-S211. doi:10.1016/j.nima.2009.03.196Ardid, M., Adrián, S., Bou-Cabo, M., Larosa, G., Martínez-Mora, J. A., Espinosa, V., … Ferri, M. (2012). R&D studies for the development of a compact transmitter able to mimic the acoustic signature of a UHE neutrino interaction. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 662, S206-S209. doi:10.1016/j.nima.2010.11.139Francois, R. E., & Garrison, G. R. (1982). Sound absorption based on ocean measurements: Part I: Pure water and magnesium sulfate contributions. The Journal of the Acoustical Society of America, 72(3), 896-907. doi:10.1121/1.388170Francois, R. E., & Garrison, G. R. (1982). Sound absorption based on ocean measurements. Part II: Boric acid contribution and equation for total absorption. The Journal of the Acoustical Society of America, 72(6), 1879-1890. doi:10.1121/1.388673Ardid, M., Bou-Cabo, M., Camarena, F., Espinosa, V., Larosa, G., Llorens, C. D., & Martínez-Mora, J. A. (2011). R&D towards the acoustic positioning system of KM3NeT. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 626-627, S214-S216. doi:10.1016/j.nima.2010.06.25
Acoustic signal detection through the cross-correlation method in experiments with different signal to noise ratio and reverberation conditions
No full text[EN] The study and application of signal detection techniques based on
cross-correlation method for acoustic transient signals in noisy and reverberant
environments are presented. These techniques are shown to provide high signal
to noise ratio, good signal discernment from very close echoes and accurate
detection of signal arrival time. The proposed methodology has been tested on
different signal to noise ratio and reverberation conditions using real data collected
in several experiences related to acoustic systems in astroparticle detectors.
This work focuses on the acoustic detection applied to tasks of positioning
in underwater structures and calibration such those as ANTARES and KM3NeT
deep-sea neutrino telescopes, as well as, in particle detection through acoustic
events for the COUPP/PICO detectors. Moreover, a method for obtaining the
real amplitude of the signal in time (voltage) by using cross correlation has been
developed and tested and is described in this work.This work has been supported by the Ministerio de Economía y Competitividad (Spanish Government), project ref. FPA2012-37528-C02-02 and Multidark
(CSD2009-00064). It has also being funded by Generalitat Valenciana, Prometeo/2009/26, and ACOMP/2014/153. Thanks to the ANTARES Collaboration for the help in the measurements made in the ANTARES deep-sea neutrino telescope.Adrián Martínez, S.; Bou Cabo, M.; Felis, I.; Llorens Alvarez, CD.; Martínez Mora, JA.; Saldaña, M.; Ardid Ramírez, M. (2015). Acoustic signal detection through the cross-correlation method in experiments with different signal to noise ratio and reverberation conditions. Lecture Notes in Computer Science. 8629:66-79. https://doi.org/10.1007/978-3-662-46338-3_7S66798629Ageron, M., et al. (ANTARES Collaboration): ANTARES: the first undersea neutrino telescope. Nucl. Instr. Meth. A 656, 11–38 (2011)The KM3NeT Collaboration: KM3NeT technical design report (2010). ISBN 978-90-6488-033-9. www.km3net.orgBehnke, E., et al. (COUPP Collaboration): First dark matter search results from a 4-kg CF3I bubble chamber operated in a deep underground site. Phys. Rev. D 86, 052001 (2012)Ardid, M.: Positioning system of the ANTARES neutrino telescope. Nucl. Instr. Meth. A 602, 174–176 (2009)Larosa, G., Ardid, M.: KM3NeT acoustic position calibration of the KM3NeT neutrino telescope. Nucl. Instr. Meth. A 718, 502–503 (2013)Ardid, M.: ANTARES: an underwater network of sensors for neutrino astronomy and deep-sea research. Ad Hoc Sensor Wirel. Netw. 8, 21–34 (2009)Bou-Cabo, M., Ardid, M., Felis, I.: Acoustic studies for alpha background rejection in dark matter bubble chamber detectors. In: Proceedings of the IV International Workshop in Low Radioactivity Techniques. AIP Conference Proceedings, vol. 1549, pp. 142–147 (2013)Proakis, J.G., Manolakis, D.G.: Digital Signal Processing, 3rd edn. Prentice Hall, Upper Saddle River (1996)Saldaña, M.: Acoustic system development for the underwater neutrino telescope positioning KM3NeT, Bienal de Física (2013)Ardid, M., et al.: Acoustic transmitters for underwater neutrino telescopes. Sensors 12, 4113–4132 (2012)Felis, I., Bou-Cabo, M., Ardid, M.: Sistemas acústicos para la detección de Materia Oscura, Bienal de Física (2013)Llorens, C.D., et al.: The sound emission board of the KM3NeT acoustic positioning system. J. Instrum. 7, C01001 (2012)Graf, K.: Experimental studies within ANTARES towards acoustic detection of ultra high energy neutrinos in the deep sea. Ph.D. thesis, U. Erlangen, FAU-PI1-DISS-08-001 (2008
The sound emission board of the KM3NeT acousticpositioning system
No full text[EN] We describe the sound emission board proposed for installation in the acoustic positioning system of the future KM3NeT underwater neutrino telescope. The KM3NeT European consortium aims to build a multi-cubic kilometre underwater neutrino telescope in the deep Mediterranean Sea. In this kind of telescope the mechanical structures holding the optical sensors, which detect the Cherenkov radiation produced by muons emanating from neutrino interactions, are not completely rigid and can move up to dozens of meters in undersea currents. Knowledge of the position of the optical sensors to an accuracy of about 10 cm is needed for adequate muon track reconstruction. A positioning system based on the acoustic triangulation of sound transit time differences between fixed seabed emitters and receiving hydrophones attached to the kilometre-scale vertical flexible structures carrying the optical sensors is being developed. In this paper, we describe the sound emission board developed in the framework of KM3NeT project, which is totally adapted to the chosen FFR SX30 ultrasonic transducer and fulfils the requirements imposed by the collaboration in terms of cost, high reliability, low power consumption, high acoustic emission power for short signals, low intrinsic noise and capacity to use arbitrary signals in emission mode.This work was supported by the European Commission through the KM3NeT Design Study (FP6, contract no. DS 011937) and Preparatory Phase (FP7, grant no. 212525) and also by the Ministerio de Ciencia e Innovacion (Spanish Government), project references FPA2009-13983-C02-02, ACI2009-1067, Consolider-Ingenio Multidark (CSD2009-00064). It was also funded by Generalitat Valenciana, Prometeo/2009/26.Llorens Alvarez, CD.; Ardid Ramírez, M.; Sogorb Devesa, TC.; Bou Cabo, M.; Martínez Mora, JA.; Larosa, G.; Adrián Martínez, S. (2012). The sound emission board of the KM3NeT acousticpositioning system. Journal of Instrumentation. 7(1):1-9. https://doi.org/10.1088/1748-0221/7/01/C01001S1971Ageron, M., Aguilar, J. A., Al Samarai, I., Albert, A., Ameli, F., André, M., … Ardid, M. (2011). ANTARES: The first undersea neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 656(1), 11-38. doi:10.1016/j.nima.2011.06.103Ardid, M. (2009). Positioning system of the ANTARES neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 602(1), 174-176. doi:10.1016/j.nima.2008.12.033Ardid, M., Bou-Cabo, M., Camarena, F., Espinosa, V., Larosa, G., Llorens, C. D., & Martínez-Mora, J. A. (2010). A prototype for the acoustic triangulation system of the KM3NeT deep sea neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 617(1-3), 459-461. doi:10.1016/j.nima.2009.10.110Ardid, M., Bou-Cabo, M., Camarena, F., Espinosa, V., Larosa, G., Llorens, C. D., & Martínez-Mora, J. A. (2011). R&D towards the acoustic positioning system of KM3NeT. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 626-627, S214-S216. doi:10.1016/j.nima.2010.06.250Ameli, F., Ardid, M., Bertin, V., Bonori, M., Bou-Cabo, M., Calì, C., … Viola, S. (2011). R&D for an innovative acoustic positioning system for the KM3NeT neutrino telescope. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 626-627, S211-S213. doi:10.1016/j.nima.2010.04.130Taiuti, M., Aiello, S., Ameli, F., Amore, I., Anghinolfi, M., Anzalone, A., … Bersani, A. (2011). The NEMO project: A status report. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 626-627, S25-S29. doi:10.1016/j.nima.2010.04.07
New Insights into the Design and Application of a Passive Acoustic Monitoring System for the Assessment of the Good Environmental Status in Spanish Marine Waters
No full text[EN] Passive acoustic monitoring systems allow for non-invasive monitoring of underwater species and anthropogenic noise. One of these systems has been developed keeping in mind the need to create a user-friendly tool to obtain the ambient noise indicators, while at the same time providing a powerful tool for marine scientists and biologists to progress in studying the effect of human activities on species and ecosystems. The device is based on a low-power processor with ad-hoc electronics, ensuring that the system has efficient energy management, and that the storage capacity is large enough to allow deployments for long periods. An application is presented using data from an acoustic campaign done in 2018 at El Gorguel (Cartagena, Spain). The results show a good agreement between theoretical maps created using AIS data and the ambient noise level indicators measured in the frequency bands of 63 Hz and 125 Hz specified in the directive 11 of the EU Marine Strategy Framework Directive. Using a 2D representation, these ambient noise indicators have enabled repetitive events and daily variations in boat traffic to be identified. The ship noise registered can also be used to track ships by using the acoustic signatures of the engine propellers¿ noise.Lara Martínez, G.; Miralles Ricós, R.; Bou-Cabo, M.; Esteban, JA.; Espinosa Roselló, V. (2020). New Insights into the Design and Application of a Passive Acoustic Monitoring System for the Assessment of the Good Environmental Status in Spanish Marine Waters. Sensors. 20(18):1-12. https://doi.org/10.3390/s20185353S1122018Lara, G., Bou-Cabo, M., Esteban, J. A., Espinosa, V., & Miralles, R. (2019). Design and Application of a Passive Acoustic Monitoring System in the Spanish Implementation of the Marine Strategy Framework Directive. Proceedings of 6th International Electronic Conference on Sensors and Applications. doi:10.3390/ecsa-6-06568SAMARUC Webhttp://samaruc.webs.upv.esExplora (Patents and Software) UPV Webhttps://aplicat.upv.es/exploraupv/ficha-tecnologia/patente_software/15065?busqueda=R-16202-2012Beghi, M. G. (Ed.). (2013). Modeling and Measurement Methods for Acoustic Waves and for Acoustic Microdevices. doi:10.5772/2581Oceans Physics at Your Fingertipshttps://www.emodnet-physics.eu/Map/Gridded Bathymetric Datahttps://www.gebco.net/data_and_products/gridded_bathymetry_data/Mackenzie, K. V. (1981). Nine‐term equation for sound speed in the oceans. The Journal of the Acoustical Society of America, 70(3), 807-812. doi:10.1121/1.386920Ross, D., & Kuperman, W. A. (1989). Mechanics of Underwater Noise. The Journal of the Acoustical Society of America, 86(4), 1626-1626. doi:10.1121/1.398685Gervaise, C., Kinda, B. G., Bonnel, J., Stéphan, Y., & Vallez, S. (2012). Passive geoacoustic inversion with a single hydrophone using broadband ship noise. The Journal of the Acoustical Society of America, 131(3), 1999-2010. doi:10.1121/1.3672688Crocker, S. E., Nielsen, P. L., Miller, J. H., & Siderius, M. (2014). Geoacoustic inversion of ship radiated noise in shallow water using data from a single hydrophone. The Journal of the Acoustical Society of America, 136(5), EL362-EL368. doi:10.1121/1.4898739Li, H., Yang, K., Duan, R., & Lei, Z. (2017). Joint Estimation of Source Range and Depth Using a Bottom-Deployed Vertical Line Array in Deep Water. Sensors, 17(6), 1315. doi:10.3390/s17061315Tong, J., Hu, Y.-H., Bao, M., & Xie, W. (2013). Target tracking using acoustic signatures of light-weight aircraft propeller noise. 2013 IEEE China Summit and International Conference on Signal and Information Processing. doi:10.1109/chinasip.2013.6625333Lo, K. W., Perry, S. W., & Ferguson, B. G. (2002). Aircraft flight parameter estimation using acoustical Lloyd’s mirror effect. IEEE Transactions on Aerospace and Electronic Systems, 38(1), 137-151. doi:10.1109/7.993235Miralles, R., Lara, G., Gosalbez, J., Bosch, I., & León, A. (2019). Improved visualization of large temporal series for the evaluation of good environmental status. Applied Acoustics, 148, 55-61. doi:10.1016/j.apacoust.2018.12.00
Acoustics for underwater neutrino telescopes
No full textEn esta tesis se tratan diferentes aspectos de la acústica presente en un telescopio submarino de neutrinos, principalmente en dos vertientes: en el sistema de posicionamiento acústico utilizado para la monitorización de las posiciones de los módulos ópticos presentes a lo largo del detector, así como en sistemas para detección acústica de neutrinos, técnica que actualmente está en fase de estudio. Todos los estudios realizados están enmarcados dentro de dos colaboraciones europeas para el diseño, construcción y operación de telescopios submarinos de neutrinos: Antares (en fase de operación) y KM3NET (en fase de diseño).
Objetivos.
Los objetivos de este trabajo pueden resumirse en los siguientes aspectos:
- Estudios y análisis del sistema de posicionamiento acústico de Antares. Desarrollo del software para la para la automatización del procesado de los datos de dicho sistema e incorporación de los resultados en la base de datos del experimento. Análisis de los datos proporcionados por dicho sistema con el fin de validar su correcto funcionamiento.
- Diseño y desarrollo del sistema de posicionamiento acústico para KM3NeT, telescopio unas 20 veces más grande que Antares.
- Estudios para la evaluación de la generación acústica paramétrica para el desarrollo de un calibrador compacto capaz de generar señales tipo neutrino útiles en sistemas de detección acústica.
Elementos de la metodología a destacar.
Cabe destacar aquí que el trabajo se ha desarrollado en el marco de dos colaboraciones internacionales: ANTARES y KM3NeT, financiados con fondos europeos y nacionales. Por su contexto y el carácter de las actividades realizadas ha sido necesaria la formación en distintos campos: telescopios de neutrinos y astropartículas, pero también en otras áreas como la acústica submarina. Además, se ha desarrollado diversas capacidades y destrezas en diversos ámbitos: en instrumentación, en aplicaciones informáticas, en análisis de datos, etc.
Más concretamente, se ha trabajado en aplicaciones informáticas para los
desarrollos y análisis en ANTARES.Bou Cabo, M. (2011). Acoustics for underwater neutrino telescopes [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/10989Palanci
Design and Application of a Passive Acoustic Monitoring System in the Spanish Implementation of the Marine Strategy Framework Directive
No full text[EN] A passive acoustic monitoring (PAM) device named SAMARUC has been developed to acquire underwater sounds following the specifications of the Monitoring Guidance for Underwater Noise in European Seas: Monitoring Guidance Specifications. Based on a Texas Instruments processor, an ultra-low power ADC was programmed to work at a sampling rate of 192 kHz and adhoc electronics were designed allowing the processor¿s two microSD buses to be used, thereby increasing the storage capacity. Many other software and hardware enhancements were implemented, such as the new low latency file system, the construction of NITUFF anodized aluminium housing and ringed buoys. With the resulting application, data obtained by the SAMARUC at El Gorguel (Cartagena, Spain) in 2018 were compared to a theoretical underwater noise map created using AIS data. This was done following the Descriptor D11.2 by means of the ambient noise level indicators at two one-third-octave frequency bands (63 Hz and 125 Hz), mainly related to marine traffic and noise pollution. The conjunction between the acquisition of underwater acoustic data and the development of a numerical propagation model was found to be highly recommendable to estimate the ambient continuous noise level when validating the acquired data as well as when correcting the prediction provided by the model.Lara, G.; Bou-Cabo, M.; Esteban, JA.; Espinosa Roselló, V.; Miralles Ricós, R. (2019). Design and Application of a Passive Acoustic Monitoring System in the Spanish Implementation of the Marine Strategy Framework Directive. MDPI. 1-7. https://doi.org/10.3390/ecsa-6-06568S1
R&D towards the acoustic positioning system of KM3NeT
No full text[EN] In this paper we present a possible solution for the acoustic positioning system of KM3NeT, a future very large undersea neutrino telescope. The system consists of an array of budget-priced acoustic transducers that can operate as emitters and receivers in the 2040 kHz region and withstand the high pressures (up to 500 bar). Versatile associated low-power electronics has been developed, implementing the all-data-to-shore approach. Besides controlling signal transmission and reception, the electronics allows for transducer configuration from shore to benefit from varied on-shore signal processing techniques. We will describe the prototype transceiver and the tests performed to study its specifications, demonstrating that the system fulfils the requirements for the acoustic positioning calibration of KM3NeT. © 2010 Elsevier B.V. All rights reserved.This work has been supported by the Spanish Ministerio de Ciencia e Innovación, ref. FPA2007-63729 and ACI2009-1067, Generalitat Valenciana (Prometeo/2009/26) and the European 6th and 7th Framework Programmes, contract no. DS 011937 and grant no. 212525, respectivelyArdid Ramírez, M.; Bou Cabo, M.; Camarena Femenia, F.; Espinosa Roselló, V.; Larosa, G.; Llorens Alvarez, CD.; Martínez Mora, JA. (2011). R&D towards the acoustic positioning system of KM3NeT. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 626:S214-S216. https://doi.org/10.1016/j.nima.2010.06.250SS214S21662
Evaluating dolphin damage in trammel net fisheries in the Valencia region: Insights to improve management
No full text[EN] Interactions between dolphins and trammel net fisheries have been described in the Mediterranean Sea as having negative consequences for both cetaceans and fishers. There is a need for studies that evaluate the economic costs caused by dolphins feeding from entangled fishes in trammel nets since most cetacean species involved in these interactions are endangered. This study aims to evaluate the economic impact of the interaction between dolphins and trammel nets fisheries in the coastal waters of the Valencian region in the western Mediterranean Sea. We conducted at-port visual inspections of nets from April 2018 to March 2019, which included 1,849 fishing operations with trammel nets, and we recorded damages to the net and catch and the value of the fishery. Thirty-two interactions were detected during the year of the study. The only observed species interacting was the common bottlenose dolphin. No bycatch of dolphins was reported. The interactions have been impacted seasonally and most of them took place in February and March. There were no significant differences in catch when comparing sets with and without depredation or damage in nets due to depredation by dolphins. Also on average, no differences were found in the value of the catch when comparing sets with or without damage caused by dolphins. The main cost to the fisher was the cost of repairing the nets. The estimated financial loss per vessel and year was €556 (95%CI: €303¿€809). This represents less than 1% of the total yearly income of each vessel in our area. We suggest implementing tools to economically compensate artisanal vessels for any damage caused by dolphins in order to avoid increasing the hostile feeling of fishers towards dolphins and to apply conservation measures to protect this cetacean species.Feliu-Tena, B.; Rodilla, M.; Pastor Gimeno, JI.; Abalo-Morla, S.; Bou-Cabo, M.; Belda, E. (2023). Evaluating dolphin damage in trammel net fisheries in the Valencia region: Insights to improve management. Regional Studies in Marine Science. 65. https://doi.org/10.1016/j.rsma.2023.103075S6
Development of an acoustic transceiver for the KM3NeT positioning system
No full text[EN] In this paper we describe an acoustic transceiver developed for the KM3NeT positioning system. The acoustic transceiver is composed of a commercial free flooded transducer, which works mainly in the 20-40 kHz frequency range and withstands high pressures (up to 500 bars). A sound emission board was developed that is adapted to the characteristics of the transducer and meets all requirements: low power consumption, high intensity of emission, low intrinsic noise, arbitrary signals for emission and the capacity of acquiring the receiving signals with very good timing precision. The results of the different tests made with the transceiver in the laboratory and shallow sea water are described, as well as, the activities for its integration in the Instrumentation Line of the ANTARES neutrino telescope and in a NEMO tower for the in situ tests. © 2012 Elsevier B.V. All rights reserved.This work has been supported by the Ministerio de Ciencia e Innovacion (Spanish Government), Project references FPA2009-13983-C02-02, ACI2009-1067, AIC10-D-00583, and Consolider-Ingenio Multidark (CSD2009-00064). It has also been funded by Generalitat Valenciana, Prometeo/2009/26, and the European 7th Framework Programme, Grant no. 212525.Larosa, G.; Ardid Ramírez, M.; Llorens Alvarez, CD.; Bou Cabo, M.; Martínez Mora, JA.; Adrián Martínez, S.; KM3NeT Consortium (2013). Development of an acoustic transceiver for the KM3NeT positioning system. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 725:215-218. https://doi.org/10.1016/j.nima.2012.11.167S21521872
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