On the exponent in the power law for the attenuation at low frequencies in sandy sediments

被引：10

作者：

Carey, William M. ^{[1
]}

Pierce, Allan D. ^{[1
]}

Evans, Richard E. ^{[1
]}

Holmes, Jason D. ^{[2
]}

机构：

[1] Boston Univ, Coll Engn, Dept Mech Engn, Boston, MA 02215 USA

[2] BBN Technol, Cambridge, MA 02318 USA

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2008年 / 124卷 / 05期

关键词：

D O I：

10.1121/1.2987461

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Shallow water transmission loss measurements yield intrinsic attenuation estimates for acoustic waves in the underlying sediment, with results that are consistent with attenuation being proportional to frequency raised to a power n, with n between 1.6 and 1.87. Plausible theory suggests that n should be identically 2. The discrepancy can be explained because the inverse analysis inferences were made with the neglect of an additional attenuation mechanism where generated lower velocity shear waves carry energy downwards out of the waveguide. The shear wave effect has a weaker dependence on frequency than the intrinsic attenuation, so the apparent exponent is shifted downward. (C) 2008 Acoustical Society of America

引用

页码：EL271 / EL277

页数：7

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