The Journal of the Acoustical Society of America, 2015
This paper presents an empirical linear equation to predict peak pressure level of anthropogenic ... more This paper presents an empirical linear equation to predict peak pressure level of anthropogenic impulsive signals based on its correlation with the sound exposure level. The regression coefficients are shown to be weakly dependent on the environmental characteristics but governed by the source type and parameters. The equation can be applied to values of the sound exposure level predicted with a numerical model, which provides a significant improvement in the prediction of the peak pressure level. Part I presents the analysis for airgun arrays signals, and Part II considers the application of the empirical equation to offshore impact piling noise.
Advances in experimental medicine and biology, 2016
The study of marine soundscapes is becoming widespread and the amount of data collected is increa... more The study of marine soundscapes is becoming widespread and the amount of data collected is increasing rapidly. Data owners (typically academia, industry, government, and defense) are negotiating data sharing and generating potential for data syntheses, comparative studies, analyses of trends, and large-scale and long-term acoustic ecology research. A problem is the lack of standards and commonly agreed protocols for the recording of marine soundscapes, data analysis, and reporting that make a synthesis and comparison of results difficult. We provide a brief overview of the components in a marine soundscape, the hard- and software tools for recording and analyzing marine soundscapes, and common reporting formats.
The Journal of the Acoustical Society of America, 2015
Numerical models of underwater sound propagation predict the energy of impulsive signals and its ... more Numerical models of underwater sound propagation predict the energy of impulsive signals and its decay with range with a better accuracy than the peak pressure. A semi-empirical formula is suggested to predict the peak pressure of man-made impulsive signals based on numerical predictions of their energy. The approach discussed by Galindo-Romero, Lippert, and Gavrilov [J. Acoust. Soc. Am. 138, in press (2015)] for airgun signals is modified to predict the peak pressure from offshore pile driving, which accounts for impact and pile parameters. It is shown that using the modified empirical formula provides more accurate predictions of the peak pressure than direct numerical simulations of the signal waveform.
Limestone seabeds with thin or non-existent coverings of unconsolidated sediment are common aroun... more Limestone seabeds with thin or non-existent coverings of unconsolidated sediment are common around the southern Australian continental shelf and often provide strong coupling between the sound wave in the water and the shear wave in the seabed. Sound reflection from such seabeds is very weak except at the p-wave critical angle, which results in the acoustic energy transmitted to long
As part of the Coastal Water Habitat Mapping (CWHM) project of the Cooperative Research Centre fo... more As part of the Coastal Water Habitat Mapping (CWHM) project of the Cooperative Research Centre for Coastal Zone, Estuary and Waterway Management (Coastal CRC), a set of bathymetry and acoustic backscattering data was collected in Cockburn Sound, Western Australia in March 2004 in order to develop acoustic methods for seabed classification. The acoustic recordings were made over seabed areas of
This document has emerged from the Coastal Water Habitat Mapping (CWHM) Project of the Cooperativ... more This document has emerged from the Coastal Water Habitat Mapping (CWHM) Project of the Cooperative Research Centre for Coastal Zone, Estuary and Waterway Management. Material from the three year CWHM Project, together with selected information from other sources, is included in the document. The document also incorporates much of a report (Penrose and Siwabessy 2001) commissioned in 2001 by the Marine Conservation Branch of the Western Australia Department of Conservation and Land Management (CALM). Contributing authors to the present document have, in most cases, focussed on one aspect of the acoustic techniques reviewed, as outlined below. There has also been, however, considerable interaction between contributing authors during its development, and most chapters have had inputs from several of the author team. The final compilation and editing has been carried out by J. Penrose assisted by J. Siwabessy. A valuable companion document to this review is an extensive bibliography of ...
The Journal of the Acoustical Society of America, 2015
This paper presents an empirical linear equation to predict peak pressure level of anthropogenic ... more This paper presents an empirical linear equation to predict peak pressure level of anthropogenic impulsive signals based on its correlation with the sound exposure level. The regression coefficients are shown to be weakly dependent on the environmental characteristics but governed by the source type and parameters. The equation can be applied to values of the sound exposure level predicted with a numerical model, which provides a significant improvement in the prediction of the peak pressure level. Part I presents the analysis for airgun arrays signals, and Part II considers the application of the empirical equation to offshore impact piling noise.
Advances in experimental medicine and biology, 2016
The study of marine soundscapes is becoming widespread and the amount of data collected is increa... more The study of marine soundscapes is becoming widespread and the amount of data collected is increasing rapidly. Data owners (typically academia, industry, government, and defense) are negotiating data sharing and generating potential for data syntheses, comparative studies, analyses of trends, and large-scale and long-term acoustic ecology research. A problem is the lack of standards and commonly agreed protocols for the recording of marine soundscapes, data analysis, and reporting that make a synthesis and comparison of results difficult. We provide a brief overview of the components in a marine soundscape, the hard- and software tools for recording and analyzing marine soundscapes, and common reporting formats.
The Journal of the Acoustical Society of America, 2015
Numerical models of underwater sound propagation predict the energy of impulsive signals and its ... more Numerical models of underwater sound propagation predict the energy of impulsive signals and its decay with range with a better accuracy than the peak pressure. A semi-empirical formula is suggested to predict the peak pressure of man-made impulsive signals based on numerical predictions of their energy. The approach discussed by Galindo-Romero, Lippert, and Gavrilov [J. Acoust. Soc. Am. 138, in press (2015)] for airgun signals is modified to predict the peak pressure from offshore pile driving, which accounts for impact and pile parameters. It is shown that using the modified empirical formula provides more accurate predictions of the peak pressure than direct numerical simulations of the signal waveform.
Limestone seabeds with thin or non-existent coverings of unconsolidated sediment are common aroun... more Limestone seabeds with thin or non-existent coverings of unconsolidated sediment are common around the southern Australian continental shelf and often provide strong coupling between the sound wave in the water and the shear wave in the seabed. Sound reflection from such seabeds is very weak except at the p-wave critical angle, which results in the acoustic energy transmitted to long
As part of the Coastal Water Habitat Mapping (CWHM) project of the Cooperative Research Centre fo... more As part of the Coastal Water Habitat Mapping (CWHM) project of the Cooperative Research Centre for Coastal Zone, Estuary and Waterway Management (Coastal CRC), a set of bathymetry and acoustic backscattering data was collected in Cockburn Sound, Western Australia in March 2004 in order to develop acoustic methods for seabed classification. The acoustic recordings were made over seabed areas of
This document has emerged from the Coastal Water Habitat Mapping (CWHM) Project of the Cooperativ... more This document has emerged from the Coastal Water Habitat Mapping (CWHM) Project of the Cooperative Research Centre for Coastal Zone, Estuary and Waterway Management. Material from the three year CWHM Project, together with selected information from other sources, is included in the document. The document also incorporates much of a report (Penrose and Siwabessy 2001) commissioned in 2001 by the Marine Conservation Branch of the Western Australia Department of Conservation and Land Management (CALM). Contributing authors to the present document have, in most cases, focussed on one aspect of the acoustic techniques reviewed, as outlined below. There has also been, however, considerable interaction between contributing authors during its development, and most chapters have had inputs from several of the author team. The final compilation and editing has been carried out by J. Penrose assisted by J. Siwabessy. A valuable companion document to this review is an extensive bibliography of ...
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Papers by Alexander Gavrilov