Range dependent sediment sound speed profile measurements using the image source method
TypeArticles dans des revues avec comité de lecture
This paper presents a range dependent sediment sound speed profile measurement obtained using the image source method. This technique is based on the analysis of the seafloor reflected acoustic wave as a collection of image sources which positions are linked with the thick-nesses and the sound speed of the sediment stack. The data used were acquired by the NURC in 2009 during the Clutter09 experiment. The equipment used was an autonomous undersea vehicle towing a 1600–3500 Hz frequency band source and a 32 m horizontal line array of 32 hydrophones at 12m above the seabed. Under the assumption of locally range independent seabed properties, the moving horizontal array provides successive range independent sediment sound speed profiles along a track to obtain the range and depth dependent structure of the seafloor. Two key steps include recovery of the time-varying unknown array shape from the data and spatial filtering of the successive sound speed profiles. A comparison of the image source method result and seismic data along nearly the same 14 km track indicates that the seabed stratigraphy is correctly mapped by this method.
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PINSON, Samuel; CORDIOLI, Julio; GUILLON, Laurent (Acoustical Society of America, 2016)In the context of sediment characterization, layer interface roughnesses may be responsible for sound-speed profile measurement uncertainties. To study the roughness influence, a three-dimensional (3D) modeling of a layered ...
PINSON, Samuel; GUILLON, Laurent (The Acoustical Society of America, 2010)This paper presents the first results of an imaging technique that measures the geoacoustic structure of a seafloor in shallow water areas. The devices used were a broadband 100 Hz–6 kHz acoustic source towed by a ship ...
GUILLON, Laurent; HOLLAND, Charles; BARBER, Christopher (IEEE, 2011)Direct path measurements of a single-bottom interacting path on a vertical array are used to probe the seabed structure. The phase of the cross-spectrum, commonly used in engineering acoustics, permits examination of the ...
JAMET, Guillaume; GUENNOU, Claude; GUILLON, Laurent; MAZOYER, Camille; ROYER, Jean-Yves (The Acoustical Society of America, 2013)T-waves are underwater acoustic waves generated by earthquakes. Modeling of their generation and propagation is a challenging problem. Using a spectral element code—SPECFEM2D, this paper presents the first realistic ...
GUILLON, Laurent; BOUDRAA, Abdel-Ouahab (The Acoustical Society of America, 2014)This letter presents an improvement of the image source method (ISM) for geoacoustic inversion. The new algorithm is based on the Teager-Kaiser Energy Operator which ampli es the discontinuities in signals while the soft ...