Now showing items 1-9 of 9

    • Acoustical characteristics of the sea floor: experimental techniques and some examples from the Mediterranean Sea 

      Akal, Tuncay (NATO. SACLANTCEN, 1974/11)
      The acoustical properties of the sea floor are primarily determined by the physical properties of the sediments, layering in the sediments, and the roughness of the bottom and sub-bottom. Over the last decade many cores ...
    • Directional measurements of low-frequency acoustic backscattering from the seafloor 

      Berkson, Jonathan M.; Akal, Tuncay; Kloosterman, Hendrik J.; Berrou, Jean-Louis (NATO. SACLANTCEN, 1986/06)
      Long-range, low-frequency directional measurements of acoustic backscattering from the seafloor were made in the Tyrrhenian Sea using explosi ve sound sources. The signals were received by a horizontal towed array of ...
    • 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 ...
    • 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 general geophysics and geology of the Strait of Sicily 

      Akal, Tuncay (NATO. SACLANTCEN, 1972/09)
      Available geophysical and geological data combined with newly compiled bathymetric, bottom sample, underwater photograph and recently published geophysical data [Ref. lJ have been analysed to describe the geophysical and ...
    • The use of Love waves to determine the geoacoustic properties of marine sediments 

      Akal, Tuncay; Schmidt, Henrik; Curzi, P. (NATO. SACLANTCEN, 1986/06)
      The importance of the geoacoustic properties of marine sediments for low-frequency shallow water propagation is well established. Reliable compressional properties can be obtained from laboratory analysis of collected ...
    • Time dependence of infrasonic ambient seafloor noise on a continental shelf 

      Akal, Tuncay; Barbagelata, Alessandro; Guidi, Guido; Snoek, Michael (NATO. SACLANTCEN, 1986/06)
      SACLANTCEN is conducting a long term programme of ambient noise measurements that cover the frequency band from 1 to 100 Hz. A sea-bed sensor consisting of three seismometers and a hydrophone has been deployed close to the ...
    • Two-dimensional space-series analysis for sea-floor roughness 

      Akal, Tuncay; Hovem, Jens M. (NATO. SACLANTCEN, 1979/10)
      For a quantitative description of the sea-floor roughness, a numerical method has been developed to obtain the two-dimensional power spectrum and the autocorrelation function. The determination of these parameters gives ...
    • Underwater photography for quantitative description of bottom roughness 

      Akal, Tuncay (NATO. SACLANTCEN, 1985/04)
      Knowledge of the roughness of the sea floor is obviously of great importance in marine geology for understanding the processes of the ocean bottom, and in underwater acoustics for understanding the scattering process. The ...