Development of a sound propagation model to monitor seismic survey noise in Irish waters

2016 ◽  
Author(s):  
Sinead Crawford ◽  
Colin Brown ◽  
Eugene McKeown ◽  
Fiona Stapleton ◽  
Alec Duncan ◽  
...  
Keyword(s):  
Sound Propagation ◽  
Propagation Model ◽  
Seismic Survey

UNDERWATER CHARACTER AND HORIZONTAL PROPAGATION OF AIR-GUN SIGNALS

1998 ◽  
Vol 38 (1) ◽  
pp. 708
Author(s):  
J.D. Penrose ◽  
R.D. McCauley
Keyword(s):  
Shallow Water ◽  
Sound Propagation ◽  
Model Performance ◽  
Low Frequency ◽  
Propagation Model ◽  
Seismic Survey ◽  
Biological Research ◽  
Water Characteristics ◽  
Air Gun ◽  
Development Paths

This paper describes work carried out as part of an APPEA/ERDC supported project, Investigation of the Environmental Effects of Offshore Seismic Survey Activities. In this project biological research concerning the interaction of acoustic signals with marine organisms is linked to sound propagation studies focussed on frequencies, water characteristics and seabed types of relevance to offshore exploration practice. A key feature of the propagation component of the project concerns the extent to which lateral propagation of airgun signals in the water column may be adequately predicted.The study of acoustic propagation in the sea is an integral part of both scientific and defence enquiry. In recent years, the comparatively complex issue of propagation in shallow water, here considered as involving depths of 200 m or less, has received increasing attention. The literature concerning low frequency propagation in shallow water has features in common with seismic literature. Different emphases, however, notably concerning applications, the role of shear waves in solids and the geometry of the propagation environment have largely resulted in separate development paths being adopted by these two related fields. This paper summarises the range of modelling approaches available to predict shallow water propagation, some key issues influencing propagation and the influence of water and seabed parameters on model performance.An illustration of propagation model performance is provided in this paper by comparing the output from a normal mode model KRAKEN, with experimental data obtained using a mono-frequency source in shallow water in Cleveland Bay, Queensland. This offers an opportunity to assess propagation in a complex and, in acoustic terms, poorly classified environment. These results will be complemented in the conference presentation by airgun data obtained in Exmouth Gulf, Western Australia.

Seismic survey sound propagation: a Porcupine Basin noise-field

2020 ◽  
Vol 38 (1) ◽  
pp. 25-39
Author(s):  
Eoghan Daly ◽  
Sinéad Crawford Jordan ◽  
Martin White
Keyword(s):  
Sound Propagation ◽  
Seismic Survey ◽  
Noise Field ◽  
Porcupine Basin

Flow-dependent modeling of acoustic propagation based on DG-FEM method

2021 ◽  
Author(s):  
Zichen Wang ◽  
Jian Xu ◽  
Xuefeng Zhang ◽  
Can Lu ◽  
Kangkang Jin ◽  
...  
Keyword(s):  
Sound Propagation ◽  
Transmission Loss ◽  
Acoustic Propagation ◽  
Water Area ◽  
Current Speed ◽  
Propagation Model ◽  
Propagation Loss ◽  
Two Dimensional ◽  
Underwater Sound ◽  
Ocean Environment

AbstractThis paper proposes a two-dimensional underwater sound propagation model using the Discontinuous Galerkin Finite Element Method (DG-FEM) to investigate the influence of current on sound propagation. The acoustic field is calculated by the convected wave equation with the current speed parameter. Based on the current speed data from an assimilation model, a two-dimensional coupled acoustic propagation model in the Fram Strait water area is established to observe the variability in propagation loss under different seasonal velocities in the real ocean environment. The transmission loss and signal time structure are examined. The results obtained in different source frequencies are also compared. It appears that the current velocity, time and range variation all have an effect on underwater sound propagation.

Finite-Element Analysis of Effect of Wide-Base Tire on Tire-Pavement Noise

2013 ◽  
Vol 723 ◽  
pp. 105-112 ◽  
Author(s):  
Jia Sheng Yang ◽  
Tien Fang Fwa ◽  
Ghim Ping Ong ◽  
Chye Heng Chew
Keyword(s):  
Finite Element ◽  
Sound Propagation ◽  
Near Field ◽  
Interaction Model ◽  
Past Research ◽  
Propagation Model ◽  
Computer Simulation Model ◽  
Element Analysis ◽  
Noticeable Effect ◽  
Pavement Noise

This paper investigates the effect of tire width to tire-pavement noise. A tire-pavement noise numerical model in the near field has been developed using the three-dimensional finite-element method, and performed in the standard FEM code package ADINA. The model is composed of two main components: a rolling tire pavement interaction model and a sound propagation model. The tire width studied ranged from 180 to 210 mm. The computer simulation model was calibrated and validated using experimental results made available from past research. From the simulation results, it was found that tire width has a noticeable effect on tire-pavement noise. In particular, it was found that tires with wider base were found to produce higher noise levels.

Open source acoustic model development for natural and protected environments

2021 ◽  
Vol 263 (4) ◽  
pp. 2184-2195
Author(s):  
Adwait Ambaskar ◽  
Victor Sparrow
Keyword(s):  
Open Source ◽  
Outdoor Recreation ◽  
Sound Propagation ◽  
Model Development ◽  
Propagation Model ◽  
Anthropogenic Sources ◽  
Visitor Experience ◽  
Sound Sources ◽  
Sound Levels ◽  
Preliminary Version

Natural quiet and the sounds of nature are important natural resources and experiencing them is an important aspect of outdoor recreation experiences. Anthropogenic sound can negatively impact these resources and diminish the benefits realized from outdoor recreation. On public lands where many types of recreation share trails and landscapes, the sounds produced by some types of recreation (e.g., motorized recreation) can negatively impact the experiences of others. To effectively manage public resources including natural soundscapes and recreation opportunities, public land and recreation managers need an understanding of the effects of recreation-caused sounds like those associated with motorized recreation. Acoustic models for recreation and protected areas provide an essential tool to help in predicting sound levels generated by these anthropogenic sources and can aid in studying the extent of potential recreation conflicts, while providing a definite direction to mitigate such conflicts. An open source outdoor sound propagation model integrated with Geographic Information Systems (GIS) lays out a good foundation for mapping visitor experience affected by sound sources like gas compressors and motorized recreation sounds. The results thus produced present a preliminary version of an outdoor sound propagation tool, to assist parks and state forest services in making important management decisions to refine visitor experience.

Modeled acoustic propagation through a measured large-amplitude nonlinear internal wave in northern South China Sea

2020 ◽  
Author(s):  
Peng Qi
Keyword(s):  
South China Sea ◽  
Internal Waves ◽  
South China ◽  
Large Amplitude ◽  
Sound Propagation ◽  
Transmission Loss ◽  
Northern South China Sea ◽  
Acoustic Propagation ◽  
Propagation Model ◽  
China Sea

<p>Preliminary results are presented from an analysis of modeled mid-frequency sound propagation through a measured large-amplitude nonlinear internal solitary wave, and in-situ measurements of trains of nonlinear internal waves in northern South China Sea (SCS) as well. An acoustic propagation model based on ray theory was utilized to compute the transmission loss (TL) associated with passing the large depression measured internal waves. The TL was computed using the model considering (1) range-dependent and range-independent environmental scenario and (2) for different source and receiver depth configurations. This presentation will propose several interesting aspects of influence of internal waves on acoustic propagation, including "shadow zones", with or without eddy, etc.</p>

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