Knobles D P, Koch R A, Thompson L A, Focke K C, Eisman P E
Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713, USA.
J Acoust Soc Am. 2003 Jan;113(1):205-22. doi: 10.1121/1.1521930.
Part of an experiment to test a measurement package in a shallow water region in the Gulf of Mexico was designed to gather broadband acoustic data suitable for inversion to estimate seabed geoacoustic parameters. Continuous wave tow acoustic signals at multiple frequencies and broadband impulsive source signals were recorded on a horizontal line array in a high-noise environment. Simulated annealing with a normal mode forward propagation model is utilized to invert for a geoacoustic representation of the seabed. Several inversions are made from different data samples of two light bulb implosions, the measured sound speed profiles at the HLA and at the positions of the light bulb deployments, and for two different cost functions. The different cost functions, measured sound speed profiles, and measured time series result in different inverted geoacoustic profiles from which transmission loss is generated for comparison with measurements. On the basis of physical consistency and from the comparison of the transmission loss and time series, a best estimate geoacoustic profile is selected and compared to those obtained from previously reported inversions. Uncertainties in the sound speed profile are shown to affect the uncertainties of the estimated seabed parameters.
在墨西哥湾浅水区测试测量包的一项实验的一部分，旨在收集适合反演以估计海底地球声学参数的宽带声学数据。在高噪声环境下，在水平线阵列上记录了多个频率的连续波拖曳声学信号和宽带脉冲源信号。利用具有简正波向前传播模型的模拟退火算法来反演海底的地球声学表示。从两个灯泡内爆的不同数据样本、水平线阵列处以及灯泡部署位置处测量的声速剖面，以及针对两个不同的代价函数进行了多次反演。不同的代价函数、测量的声速剖面和测量的时间序列导致不同的反演地球声学剖面，从中生成传输损耗以与测量结果进行比较。基于物理一致性以及传输损耗和时间序列的比较，选择了最佳估计的地球声学剖面，并与先前报道的反演结果进行比较。结果表明，声速剖面的不确定性会影响估计的海底参数的不确定性。
