PROBLEM 



Within a general investigation of the properties, mechanisms, 

 and origins of low -frequency underwater ambient noise, examine 

 the relationships, if any, between deep, open-ocean ambient sea 

 noise, in the frequency range from 10 to 400 c/s, and both near 

 and distant wave height and wind speed. 



RESULTS 



1. Sound pressure spectrum level is influenced by wave height 

 and wind speed at both ends of the frequency range from 10 to 

 400 c/s; greatest dependence is in the 160-to-400-c/s portion. 



2. Ambient-noise levels in the range from 32 to 160 c/s are the 

 least influenced by near and distant wave height. 



3. No dependence of ambient-noise levels on distant wave- 

 height fluctuation was observed for periods during which local 

 wave-height conditions were moderate and uniform. 



RECOMMENDATIONS 



1. Extend the analysis of the noise data acquired in this project 

 to ambient noise below 10 c/s. 



= ADMINISTRATIVE INFORMATION 



Work was performed under SF 101 03 15, Task 8119 (NEL 

 L20461). The report covers work from 1 July 1965 to 1 June 1966 

 and was approved for publication 11 July 1966. 



