高荪培,邹博.基于 Sobol 法的海底反向散射模型参数敏感度分析[J].海洋通报,2019,(3):
基于 Sobol 法的海底反向散射模型参数敏感度分析
Sensitivity analysis of seafloor backscattering intensity parameter based on Sobol method
投稿时间:2018-08-10  修订日期:2018-11-04
DOI:10.11840/j.issn.1001-6392.2019.03.009
中文关键词:  后向声散射  敏感度分析  Sobol 算法
英文关键词:backward acoustic scattering  sensitivity analysis  Sobol algorithm
基金项目:
作者单位E-mail
高荪培 天津大学 海洋科学与技术学院天津 300072 gaosunpei@tju.edu.cn 
邹博 天津大学 海洋科学与技术学院天津 300072 zouboyou@tju.edu.cn 
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中文摘要:
      为了对海底声学参数反演中的估计精度做出预估,合理解释反演结果,本文基于 Jackson 海底声散射模型,利用 Sobol算法,对该模型中的耗散系数、速度比等 7 个参数进行定量的敏感度分析。Sobol 算法可以给出参数的一阶敏感度和参数间相互作用的敏感度,适用于分析散射强度的影响因子。仿真结果表明,所选择的声波频率对于参数的敏感度影响不大,模型各参数交互作用较为强烈,速度比的全局敏感度最大,而耗散系数敏感度很小。将参数划分为地声属性参数、粗糙度参数和非均匀性参数,地声属性参数敏感度最大。模型参数敏感度分析结果对于反演有一定的指导作用。
英文摘要:
      In order to make a reasonable estimation of the accuracy in the acoustic parameters inversion of the seabed and interpret the inversion results, based on the Jackson seafloor acoustic scattering model, this paper evaluated the sensitivity of seven parameters such as the dissipation coefficient and the speed ratio of the model using the Sobol algorithm. The Sobol algorithm can give the first-order sensitivity of the parameters and the sensitivity of the interaction between the parameters, and it is suitable for analyzing the influence factors of the scattering intensity. The simulation results show that the selected acoustic frequencies have little effect on the sensitivity of the parameters. The interaction between the parameters of the model is strong, while the global sensitivity of the speed ratio is the highest, and the sensitivity of the dissipation coefficient is the least. The parameters are divided into geoacoustic parameters, roughness parameters and non-uniformity parameters, with the geoacoustic attribute parameters have the highest sensitivity. The sensitivity analysis results of model parameter may provide reference to relative measurement and inversion.
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