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A variable separation approach is used to obtain exact solutions of the Nizhnik-Novikov- Veselov equation. Some exact solutions of this model are analysed to study the interaction between a line soliton and a y-periodic soliton. The interactions are classified into several types according to the phase shifts due to the collision. There are two types of singular interactions: One is the resonant interaction that generates one line soliton, while the other is the extremely repulsive or long-range interaction where two solitons interchange infinitely apart. Detailed behaviors of interactions are illustrated both analytically and graphically.

Interaction between a Line Soliton and a Y-Periodic Soliton in the (2+1)-dimensional Nizhnik-Novikov-Veselov Equation