Browsing Reprints by Subject "Internal waves"

Now showing items 1-6 of 6

    • A wave-theoretic method for estimating the effects of internal tides on acoustic wave transmission 

      Ramsdale, D. J. (NATO. SACLANTCEN, 1975/10)
      The effect of the first mode semidiurnal internal tide on a ducttype sound speed profile was approximated by varying the minimum velocity of the parabolic profile in a sinusoidal fashion with a period of 12.42 hours. The ...

    • Influence of internal waves on sound propagation in the SOFAR channel 

      Essen, Heinz-Hermann (NATO. SACLANTCEN, 1975/10)
      In this paper theoretical investigations due to the influence of internal waves to sound propagation in the SOFAR-channel are presented. The undisturbed acoustic field is described by a normal-mode model. The disturbance ...

    • Obtaining the ocean index of refraction spectrum from the acoustic amplitude fluctuations 

      Rouseff, Daniel; Ewart, Terry E.; Reynolds, Stephen A. (NATO. SACLANTCEN, 1997)
      The feasibility of using acoustic measurements to determine the properties of a shallow water internal wave field is investigated through numerical simulations. The random intemal wave field is modeled by a generalized ...

    • Some acoustic effects of internal macrostructure 

      Mellen, Robert H.; Browning, David G. (NATO. SACLANTCEN, 1975/10)
      Some recent experimental developments relating to internal oceanographic- acoustic interactions are reviewed. Besides amplitude and phase fluctuations, a major concern is scattering into shadow regions. Associated oceanographic ...

    • Two dimensional internal-wave spectra 

      Bell, T. H.; Bergin, J. M.; Dugan, J. P.; Hamilton, Z. C. B.; Morris, W. D.; Okawa, B. S.; Rudd, E. E.; Witting, J. (NATO. SACLANTCEN, 1975/10)
      Although spatial fluctuations of the sound speed in the ocean have a variety of causes, internal waves are thought to produce most of the fluctuations over horizontal scales ranging from several tens of metres to several ...

    • Variability in the Gulf of Cadiz: internal waves and globs 

      Cairns, James (NATO. SACLANTCEN, 1980/08)
      An experiment was performed in the Gulf of Cadiz during June 1977, with the objective of separating oceanic variability due to internal waves from that due to inhomogeneities of the water. A CTD which oscillates in depth ...