Mid-to-high-frequency geo-acoustic inversion using bottom loss data off the west coast of India

Bottom Loss measurements at a shallow water site off the west coast of India are presented as a function of frequency (5-15 kHz) and seabed grazing angle (4°-16°). The sediment layer modelled as a homogeneous fluid half-space fails to provide accurate results for grazing angles above 10 degrees especially at higher frequencies. For improved modelling of bottom loss, a two-layered sediment underlying a water layer along with a set of geo-acoustic parameters is considered. Bottom loss values estimated from the best-fit geo-acoustic model agree reasonably well with the observations of bottom loss over the entire frequency range.