UACE2017 Proceedings: The Role of Simulated Small-Scale Ocean Variability in Inverse Computations for Ocean Acoustic Tomography

Session:
Ocean Acoustic Tomography - Various application and data
Paper:
The Role of Simulated Small-Scale Ocean Variability in Inverse Computations for Ocean Acoustic Tomography
Author(s):
Brian Dushaw, Hanne Sagen
Abstract:
The limestone sediment is modeled as an elastic solid of shear wave speed which is slightly less than the water-column sound speed; the sandy slope is modeled as a fluid of sound speed which is greater than that in the water-column. The direct arrival is modeled by a group of wave motions of a few bounces off the elastic bottom, thus coming in nearly at the bearing of the towed source; the refracted arrival is modeled by a group of horizontally refracted wave motions of multiple bounces off the sloping fluid bottom, thus coming from angles in-shore of the source bearing. The so modeled two arrivals show the same salient features as the data: the wave motions comprising the direct group are attenuated due to the shear conversion in the elastic bottom, whereas the RLs of the wave motions comprising the horizontally refracted group are preserved since they undergo total reflections at the fluid bottom.
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