Browsing by Author "Fortuin, Leonard"

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    • The sea surface as a random filter for underwater sound waves 

      Fortuin, Leonard (NATO. SACLANTCEN, 1974/06)
      In this dissertation the phenomenon of scattering and reflection of underwater sound waves from the sea surface is studied by considering the surface sound channel as a random, time-dependent filter. This filter can be ...

    • The wave equation in a medium with a time-dependent boundary 

      Fortuin, Leonard (NATO. SACLANTCEN, 1974/02)
      It is shown that the Helmholtz equation is not exactly correct for a medium with a time-dependent boundary. The equation can be used with very good approximation when the time-derivative of the surface elevation is much ...