Shaping a field of acoustic parametric array in periodic structure with diffuse borders

A possibility a realization of nonlinear acoustic interactions in layered media, for whole remote sensing and studying the ocean inhomogeneities, is considered. Was it earlier supposed that exists a discrete changing the physical parameters of media along or across the direction of spreading a primary field of radiation. Such presentation of real media may be elaborated and extents for more general cases of continuos, smooth (including and periodic) varying the parameters of media, and in the first place along the direction of spreading of nonlinear interacting of field primary pumping waves. Such presentation of media distinctive parameters spatial changing can be interpreted as a stratified structure of medium with diffuse borders. Herewith real structures sub-bottom domains and bottom possible to represent as a layers set with diffuse borders in most cases, i.e, borders, in which properties of contacting medium are changed sufficiently fluent.