Range-Dependent Inversion for Seabed Parameters Using Vector Acoustic Measurements of Underwater Ship Noise

The Intensity Vector Autonomous Recorder (IVAR) measures acoustic particle velocity and pressure simultaneously. IVAR was deployed on the seabed during 2017 Seabed Characterization Experiment (SBCEX) with primary objective to study sound propagation within underwater waveguides for which consists of fine-grained, muddy sediments. In this study, a Bayesian framework is applied noise recorded by from cargo ship traversing central region SBCEX2017 area purpose inversion characterize sediment properties. vector data are in form bounded, nondimensional known as circularity, quantity that independent noise-source spectrum can be interpreted normalized curl active intensity. model space low-compressional speed layer underlying basement half-space, each having compressional shear components. interpretative producing replica based plane wave reflection coefficient layered, elastic conjunction depth-dependent Green’s function integrated complex number obtain fields. small change water depth between location source addressed using adiabatic mode theory. results exhibit slow variation over 20-min observation period, representing approximately 5 km travel source.