Accession Number : AD0770245

Title :   An Experimental Study of Forward Scattering and Reflection of Underwater Sound Waves from the Rough Sea Surface,

Corporate Author : SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)

Personal Author(s) : Wijmans,Willem

Report Date : 01 OCT 1973

Pagination or Media Count : 37

Abstract : An experimental study of forward scattering from a rough sea surface has been made using an explosive charge as a broadband sound source and a linear array of omnidirectional hydrophones as a receiver. Using the surface grazing angle of the incident sound and the sea surface roughness as parameters the amount of coherence has been examined for a surface reflection (temporal coherence) and for the signals from two hydrophones of the array (spatial coherence). A simple theory has been used to guide the analysis. The surface scattering is assumed to consist of a coherent part and an additional incoherent part. This theory describes the surface scattering sufficiently well to agree with the experimental results. (Author)

Descriptors :   *Ocean surface, *Underwater sound, *Acoustic scattering, *Acoustic reflection, Sea states, Surface roughness, Sound transmission, Italy

Subject Categories : Physical and Dynamic Oceanography
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE