Mid-frequency bottom backscatter measurements and model/data comparison

摘要

The bottom backscattering results mainly from the roughness of seafloor and heterogeneity of sub-bottom. An experiment was conducted in ASIAEX ECS 2001 site using a 32-element 3.5kHz reverberation array deployed from Melville to measure the bottom backscattering strength. The direct, bottom-reflected, surface-reflected, bottom-surface reflected, surface-bottom reflected and surface-bottom-surface reflected waves were found from the analyzed data. Through beam forming bottom backscattering strength changing with grazing angle was obtained. Model/data comparison with known environmental measurements shows that bottom roughness is the dominant scattering cause for the ASIAEX ECS site.