The Brazilian Santos basin underwater soundscape monitoring project (PMPAS-BS)
...Published in Frontiers in Marine Science
The Brazilian Santos basin underwater soundscape monitoring project (PMPAS-BS)
...
Published in Frontiers in Marine Science
This paper describes the Santos Basin Underwater Soundscape Monitoring Project (PMPAS-BS), a Brazilian ocean soundscape monitoring initiative. The main objective of the project is to quantify and assess hydroacoustic noise of anthropogenic origin in a large sedimentary basin extending from 23° S to 28° S on the southeastern Brazilian continental ma...
Application of 2E-2U method for free-field underwater calibrations of hydrophones and projectors in a reverberant labora...
Published in Measurement Science and Technology
In this paper, application of a Two-Equations Two-Unknowns (2E-2U) method is described for calibration of hydrophones and projectors below 1 kHz in a laboratory test tank. At low frequencies, amplitude and phase measurements for the calibration of the hydrophones and projectors in the test tank are difficult to perform since echo-free time of the l...
A calculable pistonphone for the absolute calibration of hydrophones in the frequency range from 0.5 Hz to 250 Hz
...
Published in Metrologia
The demand for traceable hydrophone calibrations at low frequencies in support of ocean monitoring applications requires primary standard methods that are able to realise the acoustic pascal. In this paper, a new method for primary calibration of hydrophones is described based on the use of a calculable pistonphone to cover frequencies from 0.5 Hz ...
The present and future contribution of ships to the underwater soundscape
Published in Frontiers in Marine Science
Since the industrial revolution the ocean has become noisier. The global increase in shipping is one of the main contributors to this. In some regions, shipping contributed to an increase in ambient noise of several decibels, especially at low frequencies (10 to 100 Hz). Such an increase can have a substantial negative impact on fish, invertebrates...
Pseudoreplication of sound treatments in underwater exposure studies
Sound exposure studies require replicated sound treatments for the results to be representative for sound classes in general. Additionally, reused treatments in replicated designs need to be accounted for statistically. The lack hereof is referred to as simple and sacrificial pseudoreplication, respectively, and results should be interpreted accord...
Detection of suspended macroplastics using acoustic doppler current profiler (ADCP) echo
Published in Frontiers in Earth Science
Plastic pollution has become an enormous environmental problem, endangering ecosystems, livelihoods, safety and human health. Large quantities of plastics are trapped in or transported by rivers. Monitoring methods mostly focus on plastics floating at the surface or deposited on riverbanks, while a substantial part of plastics may be transported be...
Seafloor mapping using underwater remote sensing approaches
Published in Frontiers in Earth Science
Underwater acoustic self-focusing and bending in conformal Mikaelian lens by pentamode metafluid
Published in Journal of Physics D: Applied Physics
In this paper, we present the design of an arc-shaped Mikaelian lens using conformal transformation acoustics. We have derived the propagation trajectory equation for vertically incident rays within the lens. The ray trajectories inside the designed lens exhibit the feature of self-focusing as well as of deflection of the propagation direction. The...
An Oceano-acoustic Simulation Framework for the Design of Lagrangian Systems Drifting in Mesoscale and Sub-mesoscale Cur...
Sub-mesoscale currents are of great interest for oceanographers but unfortunately their observation is a very difficult task. Lagrangian systems can be used to monitor them and require the implementation of an acoustic signal processing chain leading to the localization of each node of that system. In order to help the design of the Lagrangian syst...
