Geoacoustic inversion results of low- to high-frequency source tow data from the ASIAEX East China experiment

Abstract

During the 2001 ASIAEX East China Sea experiment, source tow data was collected by a 16-element, 75-m aperture, autonomously recording vertical line array in approximately 105-m-deep water. Transmissions from two similar 6-km-long tracks were transmitted. In the first, CW tonals at 95, 195, 295, 395, 805, 850, and 905 Hz were transmitted from a J-15 transducer at a nominal depth of 46 m. In the second, CW tonals at 1.6, 2.4, 3.5, and 4.4 kHz were transmitted from an ITC-2015 transducer at a nominal depth of 49 m. An environmental model in the study area initially was derived by matched-field geoacoustic inversion using the low-frequency track. In this study, the high-frequency data from the second track are included in the parameter assessment. A multiple-stage geoacoustic inversion scheme is applied. Inversion results for seafloor geoacoustic parameters from these transmissions will be presented. [Work supported by ONR.]