Browsing by Author "Lyons, Anthony P."
Now showing items 1-7 of 7
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Characteristics of the mediterranean seagrass Posidonia oceanica contributing to high-frequency acoustic scattering
Acunto, Stefano; Lyons, Anthony P.; Pouliquen, Eric (NATO. SACLANTCEN, 2000/05)Posidonia oceanica meadows are the most important ecosystem for the life cycle of coastal Mediterranean benthos with a fundamental role in the primary production of the neritic system and a decisive influence on other ... -
High frequency acoustic propagation in coastal waters
Akal, Tuncay; Lyons, Anthony P.; Di Iorio, Daniela; Guerrini, Piero (NATO. SACLANTCEN, 1997)High Frequency Acoustic Propagation experiments were performed with bottom-mounted sources and receivers at different coastal sites. A measurement technique has been developed and propagation loss data have been taken using ... -
High frequency acoustics in shallow water: proceedings of a conference held in Lerici, Italy, 30 June to 4 July, 1997, organized and sponsored by the NATO SACLANT Undersea Research Centre
High frequency acoustics in shallow water (1997 June 30 - July 4 : Lerici, Italy) (NATO. SACLANTCEN, 1997) -
High-resolution characterization of seafloor sediments for modeling acoustic backscatter
Orsi, Thomas H.; Duncan, Michael E.; Lyons, Anthony P.; Briggs, Kevin B.; Richardson, Michael D.; Anderson, Aubrey L. (NATO. SACLANTCEN, 1997)Quantitative information on fine-scale sediment inhomogeneity is extremely scarce and sorely needed for developing realistic volume scattering models. To address this deficiency, we present a novel approach for sediment ... -
Penetration of acoustic waves into sandy seafloors at low grazing angles: the Helmholtz-Kirchhoff approach
Pouliquen, Eric; Lyons, Anthony P.; Pace, Nicholas G. (NATO. SACLANTCEN, 1998/08)The Helmholtz-Kirchhoff integral is applied to model the penetration of sound waves into sandy seafloors at grazing angles above and below the critical angle. Although the conditions for the validity -
Statistical evaluation of 80 kHz shallow-water seafloor reverberation
Lyons, Anthony P.; Abraham, Douglas A.; Akal, Tuncay; Guerrini, Piero (NATO. SACLANTCEN, 1997)In this work a comparison is presented between 80 kHz reverberation statistics obtained at shallow water sites around Sardinia and Sicily. The data include measurements from several distinct bottom provinces, including ... -
The effect of a layer of varying density on high-frequency acoustic reflection, forward propagation loss and backscattering strength
Lyons, Anthony P.; Orsi, T.H. (NATO. SACLANTCEN, 1997/06)This report examines the impact that a thin layer of varying density would have on high-frequency reflection, forward loss and backscattering of acoustic plane waves from the seafloor. A functional form for density ...