Inverting sediment sound speed profile using a parameterized geoacoustic model: A numerical and statistical analysis
學年 101
學期 1
出版（發表）日期 2012-10-01
作品名稱 Inverting sediment sound speed profile using a parameterized geoacoustic model: A numerical and statistical analysis
作品名稱（其他語言）
著者 Chen-Fen Huang; Shih-Feng Yang; Jin-Yuan Liu
單位
出版者
著錄名稱、卷期、頁數 Journal of Marine Science and Technology,20(5),p.584-592
摘要 The objective of this paper is to develop and evaluate an inversion algorithm for estimating the parameters in a geoacoustic model for a marine sediment layer. The geoacoustic model employs a generalized-exponential function for sound speed profile, and an inverse-square function for density distribution. Based upon plane-wave reflection from a nonuniform sediment layer overlying an elastic seafloor, an inversion procedure is established and numerically implemented for estimating the parameters using synthetic noisecontaminated data. The sensitivity of each model parameter is first studied, and then three highly sensitive parameters in the geoacoustic model and one statistical parameter are chosen for inversion analysis. The resulting sound speed profiles from the inversion are analyzed by a probabilistic approach, which is quantified by the posterior probability density for the uncertainties of the estimated parameters. The parameter uncertainties referenced to 1-D and 2-D marginal posterior probability densities are investigated, followed by the statistical estimation for the sound speed profile in terms of a 95% credibility interval. We demonstrate the effects of, the signal- to-noise ratio (SNR), the dimension of the data vector, and the region in which the data are sampled, on the statistical estimation of the sound speed profile, and offer physical interpretations about the statistical variations attributable to these effects. This analysis provides a basis for estimating the acoustic properties of a continuously-stratified layer using inversion approach, and is particularly useful for a medium with properties describable by analytical functions.
關鍵字 geoacoustic inversion;generalized-exponential and inverse-square functions;parameter sensitivity analysis;uncertainty analysis;statistical estimation of inverted sound speed.
語言 zh_TW
ISSN
期刊性質 國內
收錄於
產學合作
通訊作者
審稿制度 否
國別 TWN
公開徵稿
出版型式 ,電子版
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/121069 )