TY JOUR TI BIOTURBATION AND VARIABILITY ACOUSTIC PROPERTIES TRANSITIONAL LAYER OF THE BOTTOM OF THE SHALLOW SEA KW marine sediments KW phase-velocity dispersion KW intergranular friction KW attenuation coefficient KW infauna KW bioturbation JO Russian Journal of Biological Physics and Chemisrty AU Lisyutin, V.A. AU Lastovenko, O.R. PY 2019 IS 4 PB Federal State Educational Institution of Higher Education Sevastopol State University