Accession Number : ADA486388


Title :   Improving an Empirical Formula for the Absorption of Sound in the Sea


Descriptive Note : Final rept.


Corporate Author : TNO DEFENCE SECURITY AND SAFETY THE HAGUE (NETHERLANDS)


Personal Author(s) : Moll, C A van ; Ainslie, M A ; Janmaat, J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a486388.pdf


Report Date : May 2008


Pagination or Media Count : 66


Abstract : A new empirical formula for the absorption of sound in seawater is derived. The starting point of this investigation is the formula proposed by Ainslie and McColm for attenuation due to the boron and magnesium relaxations. Constants in the expression are treated as parameters to be determined. Since this is a nonlinear inverse problem, a global search is used to find the parameter setting that yields the best fit to in situ absorption measurements. The obtained formula is simpler than and at least as accurate as the widely used absorption formula of Francois and Garrison.


Descriptors :   *ACOUSTIC ABSORPTION , *FORMULAS(MATHEMATICS) , *SEA WATER , INVERSION , IN SITU ANALYSIS , BALTIC SEA , ACCURACY , STATISTICAL TESTS , NETHERLANDS , ACOUSTIC ATTENUATION


Subject Categories : Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE