1. A method comprising: receiving data indicative of a wavefield in a processor-based system; and processing the data using at least one processor to generate a modeled wavefield, the processing including varying boundary conditions of the modeled wavefield with respect to time to regulate coherent boundary reflections in the modeled wavefield, the coherent boundary reflections being attributable to reflections of the modeled wavefield from outer boundaries of a modeled space used to generate the modeled wavefield.