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The derivative of a waveguide acoustic field with respect to a three-dimensional sound speed perturbation
2004
Journal of the Acoustical Society of America
Semianalytic expressions are derived for the first-order derivative of a pressure field in a laterally homogeneous waveguide, with respect to an arbitrary three-dimensional refractive index perturbation in either the water column or ocean bottom. These expressions for the "environmental derivative," derived using an adjoint method, require a three-dimensional spatial correlation between two Green's functions, weighted by an environmental parameter basis function, with the Green's functions
doi:10.1121/1.1736651
fatcat:errfuq6535h4lgfki4cneexfb4