Physical Modeling of the Method of Coherent Probing of Low-Contrast Bottom Layers in a Laboratory Pool

Under laboratory conditions, experimental verification of the developed algorithms for the reconstruction of low-contrast bottom layers during their coherent sensing was carried out. The algorithms use parametric models for generating signals reflected from a layered half-space in the form of a set of elastic layers. To solve the problem at the Department of Acoustics of Nizhny Novgorod State University named after. N. I. Lobachevsky created an experimental setup for the formation, emission and reception of high-resolution sound pulses reflected from a set of elastic layers placed in a pool of water. The experimental study showed the possibility of using the coherent sensing method for layered media with relatively similar acoustic parameters. As a result of processing the data obtained during the experiment in a laboratory pool, good agreement was shown between the developed computational model of the reflection of sounding acoustic pulse signals from a layered bottom and physical modeling data. It is shown that based on the analysis of the plane of geoacoustic parameters of a specific problem using the developed numerical model, the capabilities of a promising method for coherent diagnostics of low-contrast bottom layers can be assessed.