Gradient of the Cost Function Via the Adjoint Method for Underwater Acoustic Inversion

IF 1.3 3区物理与天体物理 Q3 ACOUSTICS

Journal of Theoretical and Computational Acoustics Pub Date : 2020-03-01 DOI:10.1142/S2591728519500105

J. Papadakis, E. Karasmani

引用次数: 1

Abstract

The acoustic propagation problem in the ocean is modeled via the wide angle parabolic equation with a Neumann to Dirichlet map bottom boundary condition. An environment consisting of the water column, a sediment layer and the semi-infinite sub-bottom region is considered. The derivatives of a new cost function with respect to the unknown environmental parameters are calculated analytically via the adjoint operator and incorporated numerically in an inversion scheme. Full geoacoustic inversion for eight bottom parameters is performed successfully, using experimental field data from the Yellow Shark experiment, for the first time according to the authors’ knowledge. Adjoint inversion for the water SSP, using the EOFs, is also presented and validated with simulated data.

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水声反演的伴随法代价函数梯度

利用具有诺伊曼-狄利克雷映射底边界条件的广角抛物方程对海洋中的声传播问题进行了模拟。考虑由水柱、沉积物层和半无限次底区组成的环境。通过伴随算子解析计算新的成本函数对未知环境参数的导数，并将其纳入数值反演方案。据作者所知，首次利用黄鲨实验现场数据成功进行了8个海底参数的全地球声反演。利用EOFs对水体SSP进行了伴随反演，并用模拟数据进行了验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Theoretical and Computational Acoustics Computer Science-Computer Science Applications

CiteScore

2.90

自引率

42.10%

发文量

期刊介绍： The aim of this journal is to provide an international forum for the dissemination of the state-of-the-art information in the field of Computational Acoustics. Topics covered by this journal include research and tutorial contributions in OCEAN ACOUSTICS (a subject of active research in relation with sonar detection and the design of noiseless ships), SEISMO-ACOUSTICS (of concern to earthquake science and engineering, and also to those doing underground prospection like searching for petroleum), AEROACOUSTICS (which includes the analysis of noise created by aircraft), COMPUTATIONAL METHODS, and SUPERCOMPUTING. In addition to the traditional issues and problems in computational methods, the journal also considers theoretical research acoustics papers which lead to large-scale scientific computations.