Abundant coherent structures of the (2+1)-dimensional Broer-Kaup-Kupershmidt equation

By using of the Backlund transformation, which is related to the standard t runcated Painleve analysis, some types of significant exact soliton solutio ns of the (2+1)-dimensional Broer-Kaup-Kupershmidt equation are obtained. A special type of soliton solutions may be described by means of the variabl e coefficient heat conduction equation. Due to the entrance of infinitely m any arbitrary functions in the general expressions of the soliton solution the solitons of the (2+1)-dimensional Broer-Kaup equation possess very abun dant structures. By fixing the arbitrary functions appropriately, we may ob tain some types of multiple straight line solitons, multiple curved line so litons, dromions, ring solitons and etc.