Accession Number : AD0832816

Title :   A GEOACOUSTIC SURVEY OF THE BRAZOS RIVER. PART II. ULTRASONIC ATTENUATION STUDIES,

Corporate Author : TEXAS UNIV AT AUSTIN DEFENSE RESEARCH LAB

Personal Author(s) : Muir, Thomas G., Jr. ; Pruitt, James G. ; Adair, Robert S. ; Blue, Joseph E.

Report Date : 11 JAN 1968

Pagination or Media Count : 23

Abstract : The use of high frequency sonar techniques for detection and study of submerged objects and geological features in rivers can be limited by the acoustic attenuation. This parameter was measured in a pilot study of the lower reaches of the Brazos River near Houston, Texas. The attenuation was due to the suspended particulate matter carried by this muddy river. At a frequency of 200 kHz and for a particulate concentration of 0.025% by weight with a mean particulate radius of 1.5 microns, the attenuation was found to be 1.5 dB/100 yd. This work was supported by the Office of Naval Research. (Author)

Descriptors :   (*RIVERS, TEXAS), (*UNDERWATER SOUND, ATTENUATION), ULTRASONIC PROPERTIES, HIGH FREQUENCY, SONAR EQUIPMENT, PARTICLES, MUD, COLLOIDS, DETECTION, ABSORPTION, SCATTERING, ELECTRONIC EQUIPMENT, MEASUREMENT, ECHO RANGING, UNDERWATER OBJECTS, ANOMALIES.

Subject Categories : Hydrology, Limnology and Potamology
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE