A study was conducted to demonstrate Gas-dynamic phenomena accompanying shockwave interactions with the cooling plasma of a pulsed surface discharge. The study proposed to determine the pulsed energy contributed to a flow by an electric discharge on the basis of solving the inverse problem. Unsteady gas-dynamic flow arising as a result of the instantaneous local energy contribution was simulated numerically to conduct the investigations. Experimental shadow images for the arising shockwave configurations and numerical flow patterns corresponding to the given conditions were compared. The energy contributed to gas for the time of existence of the discharge current was determined while solving the inverse problem by the trial-and-error procedure. The relaxation-zone parameters at the postdischarge stage and their evolution were investigated on the basis of the solution to the inverse problem by the trial-and-error procedure.