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Title: Modeling underwater noise propagation from marine hydrokinetic power devices through a time-domain, velocity-pressure solution

Marine hydrokinetic (MHK) devices generate electricity from the motion of tidal and ocean currents, as well as ocean waves, to provide an additional source of renewable energy available to the United States. These devices are a source of anthropogenic noise in the marine ecosystem and must meet regulatory guidelines that mandate a maximum amount of noise that may be generated. In the absence of measured levels from in situ deployments, a model for predicting the propagation of sound from an array of MHK sources in a real environment is essential. A set of coupled, linearized velocity-pressure equations in the time-domain are derived and presented in this paper, which are an alternative solution to the Helmholtz and wave equation methods traditionally employed. Discretizing these equations on a three-dimensional (3D), finite-difference grid ultimately permits a finite number of complex sources and spatially varying sound speeds, bathymetry, and bed composition. The solution to this system of equations has been parallelized in an acoustic-wave propagation package developed at Sandia National Labs, called Paracousti. This work presents the broadband sound pressure levels from a single source in two-dimensional (2D) ideal and Pekeris wave-guides and in a 3D domain with a sloping boundary. Furthermore, the papermore » concludes with demonstration of Paracousti for an array of MHK sources in a simple wave-guide.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3]
  1. Montana State Univ., Bozeman, MT (United States)
  2. DNV GL Energy and Sustainability, Seattle, WA (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND-2018-6146J
Journal ID: ISSN 0001-4966; 664142
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Journal of the Acoustical Society of America
Additional Journal Information:
Journal Volume: 143; Journal Issue: 6; Journal ID: ISSN 0001-4966
Publisher:
Acoustical Society of America
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY
OSTI Identifier:
1455220

Hafla, Erin, Johnson, Erick, Johnson, C. Nathan, Preston, Leiph, Aldridge, David, and Roberts, Jesse D.. Modeling underwater noise propagation from marine hydrokinetic power devices through a time-domain, velocity-pressure solution. United States: N. p., Web. doi:10.1121/1.5039839.
Hafla, Erin, Johnson, Erick, Johnson, C. Nathan, Preston, Leiph, Aldridge, David, & Roberts, Jesse D.. Modeling underwater noise propagation from marine hydrokinetic power devices through a time-domain, velocity-pressure solution. United States. doi:10.1121/1.5039839.
Hafla, Erin, Johnson, Erick, Johnson, C. Nathan, Preston, Leiph, Aldridge, David, and Roberts, Jesse D.. 2018. "Modeling underwater noise propagation from marine hydrokinetic power devices through a time-domain, velocity-pressure solution". United States. doi:10.1121/1.5039839.
@article{osti_1455220,
title = {Modeling underwater noise propagation from marine hydrokinetic power devices through a time-domain, velocity-pressure solution},
author = {Hafla, Erin and Johnson, Erick and Johnson, C. Nathan and Preston, Leiph and Aldridge, David and Roberts, Jesse D.},
abstractNote = {Marine hydrokinetic (MHK) devices generate electricity from the motion of tidal and ocean currents, as well as ocean waves, to provide an additional source of renewable energy available to the United States. These devices are a source of anthropogenic noise in the marine ecosystem and must meet regulatory guidelines that mandate a maximum amount of noise that may be generated. In the absence of measured levels from in situ deployments, a model for predicting the propagation of sound from an array of MHK sources in a real environment is essential. A set of coupled, linearized velocity-pressure equations in the time-domain are derived and presented in this paper, which are an alternative solution to the Helmholtz and wave equation methods traditionally employed. Discretizing these equations on a three-dimensional (3D), finite-difference grid ultimately permits a finite number of complex sources and spatially varying sound speeds, bathymetry, and bed composition. The solution to this system of equations has been parallelized in an acoustic-wave propagation package developed at Sandia National Labs, called Paracousti. This work presents the broadband sound pressure levels from a single source in two-dimensional (2D) ideal and Pekeris wave-guides and in a 3D domain with a sloping boundary. Furthermore, the paper concludes with demonstration of Paracousti for an array of MHK sources in a simple wave-guide.},
doi = {10.1121/1.5039839},
journal = {Journal of the Acoustical Society of America},
number = 6,
volume = 143,
place = {United States},
year = {2018},
month = {6}
}