A.S. Kryukovsky, D.S. Lukin, D.V. Rastyagaev, A.O. Kostyo

In the work basic concepts and results of the catastrophe theory for a calculation of wave field structure in the wave propagation and diffraction problems are considered. It is considered the uniform asymptotical solutions (in terms of the large parameter) in focal regions by the wave catastrophe theory methods. The kind of the received solutions is defined by type of the singularity ? "the catastrophe". As against traditional asymptotical approaches, the wave catastrophe theory allows to analyse some singularities of diffraction structures of complex wave fields in the case which or cannot be described by traditional asymptotical methods at all or which description is extremely complicated because of significant computing expenses. The singularities of smooth mapping, or catastrophes, correspond to steady areas of focussing (steady in relation to a small disturbance connected with the ray congruence). In essence, the areas of structural-steady focussings of wave fields define the common diffraction structure of the field. In work it is considered the information system which allows to store the data of the wave catastrope characteristics, ray and caustical structures of the wave fields in the focal regions. The offered approach bases on application of web-technologies and provides opportunities of visualization of modelling the reorganizations of ray and caustical structures, and also amplitude structures of fields in the structural - steady focal regions.