36 documents found, page 1 of 4
Common dolphin's shipping noise risk assessment on the Portuguese coast
Spadoni, Giulia; Duarte, Ricardo; Soares, Cristiano; Fernandez, Marc; Jesus, SergioOcean noise generated by human activities at sea has been increasing over the decades, affecting marine eco systems. Ship traffic flow between the Mediterranean or South Atlantic and northern Europe makes the coast of Portugal one of the most intense shipping highways on a global scale. Among the cetaceans of the coast of Portugal, the common dolphin (Delphinus delphis) was selected as a target species. Based o...
Soundscaping using a smart cable prototype off the coast of Portugal
Duarte, Ricardo; Zabel, F.; Silva, António; Jesus, SergioOcean soundscaping is an important tool to monitor ocean noise and to understand how it may impact marine life. A promising approach is the exploration of the SMART cable concept that relies on the use of a telecommunication cable equipped with environmental sensors, allowing for ocean real-time monitoring. The K2D project(1) developed a set of cable nodes with extended SMART capabilities. These nodes were test...
Ocean noise field-calibration constraints for deep sea mining
de Oliveira Júnior, Luciano; Rodríguez, Orlando; Jesus, SergioThe EU Horizon project TRIDENT aims at developing a comprehensive study to improve the understanding of the activities related to deep sea mining as well as to develop observation methodologies, technologies required for impact forecast, and possible mitigation measures. In the framework of TRIDENT, the impact of the acoustic field will be assessed by deploying a fixed array of acoustic recorders in the surroun...
A Demonstrator for future fiber-optic active SMART repeaters
Cruz, Nuno A.; Silva, António; Zabel, Friedrich; Ferreira, Bruno; Jesus, Sergio; Martins, Marcos S.; Pereira, Eduardo; Matos, Tiago; Viegas, RubenThe deep-sea environment still presents many challenges for systematic, comprehensive data acquisition. The current generation of SMART cables incorporates low-power sensors in long-range telecommunication cables to improve knowledge of ocean variables, aid in earthquake and tsunami warnings, and enhance coastal protection. The K2D Project seeks to expand SMART cables' capabilities by increasing the diversity o...
Estimating excess noise from deep sea mining: a simulated test case
Jesus, Sergio; Rodríguez, Orlando C.There at least two major potential consequences of deep sea mining: sediment plumes and energy input into the ocean. One of the major forms of energy input is ocean noise generated by the mining process. Project TRIDENT was set up under the Horizon Europe framework of the European Union, with the aim of contributing to a sustainable exploitation of seabed mineral resources, by developing a reliable, transparent...
TRIDENT – Technology based impact assessment tool foR sustaInable, transparent ...
Silva, E.; Viegas, D.; Martins, A.; Almeida, J.; Almeida, C.; Neves, B.; Madureira, P.; Wheeler, A. J.; Salavasidis, G.; Phillips, A.; Schaap, A.By creating a dependable, transparent, and cost-effective system for forecasting and ongoing environmental impact monitoring of exploration and exploitation activities in the deep sea, TRIDENT seeks to contribute to the sustainable exploitation of seabed mineral resources. In order to operate autonomously in remote locations under harsh conditions and send real-time data to authorities in charge of granting lic...
Editorial: observing ocean sound
Delory, Eric; Širovic, Ana; Jesus, SergioOcean sound is emerging as a key health indicator of marine ecosystems, increasingly at risk of anthropogenic stressors (Duarte et al., 2021). The full potential of this Essential Ocean Variable (EOV) keeps developing (Tyack, 2018). The science and methods resulting from this EOV address an increasing number of domains, from geophysics to bio- and eco-acoustics. It also offers opportunities to respond to questi...
Experimental demonstration of a single acoustic vector sensor for JANUS perform...
Bozzi, Fabricio; Jesus, SergioThis study shows the underwater communication performance using an acoustic pressure-gradient vector sensor. Combining the estimated particle velocity channels with the acoustic pressure results in a cardioid-like beam steered output, which is used to improve the signal-to-noise ratio. A shallow-water field experiment was carried out using a single vector sensor as a receiver and a ship-suspended sound source, ...
Joint vector sensor beam steering and passive time reversal for underwater acou...
Bozzi, Fabricio; Jesus, SergioThis paper investigates how to advantageously combine acoustic vector sensor field components for underwater communications. The joint vector sensor beam steering and passive time-reversal receiver structure is proposed and compared against beam steering and standard passive time-reversal separately. The beam steering method takes into account proper directions in order to benefit from highly correlated channel...
Megameter propagation and correlation of T-waves from Kermadec Trench and Islands
Oliveira, Tiago C. A.; Nielsen, Peter; Lin, Ying-Tsong; Kushida, Noriyuki; Jesus, SergioOn 18 June 2020 and 4 March 2021, very energetic low-frequency underwater T-wave signals (2 to 25 Hz) were recorded at the Comprehensive Nuclear-Test-Ban Treaty (CTBT) International Monitoring System (IMS) hydrophone stations in the Pacific Ocean (Stations HA11 and HA03) and the South Atlantic Ocean (Station HA10). This work investigates the long-range (megameters) propagation of these T-waves. Their sources we...