Propagation of Sound Through the Atmosphere: Effects of Ground Cover
Abstract
Measurements of sound amplitude in the vicinity of a ground plane have been made as a function of frequency of the sound source (100 Hz - 2000 Hz) , distance of propagation (5m - 100m), and surface conditions. By treating the impedance as an adjustable parameter, the surface impedance as a function of frequency was determined from the measured amplitudes using the theoretical treatment of a spherical wave in the vicinity of a locally reacting surface. Measurements of the amount of energy coupled into the ground were also made using geophones below the ground surface. Experimental studies of surface impedance should include measurements of soil parameters such as density, specific flow resistance, and moisture content so that comparisons can be made between the results from different laboratories and so that a data base for additional theoretical development can be established.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 19, 1978
- Accession Number
- ADA058948
Entities
People
- H. E. Bass
- L. N. Bolen
Organizations
- University of Mississippi