Accession Number:

AD0770245

Title:

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

Descriptive Note:

Corporate Author:

SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)

Personal Author(s):

• Wijmans,Willem

Report Date:

1973-10-01

Pagination or Media Count:

37.0

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