The dBSeaPE solver makes use of the parabolic equation method, a versatile and robust method of marching the sound field out in range from the sound source. This method is one of the most widely used in the underwater acoustics community, and offers excellent performance in terms of speed and accuracy in a range of challenging scenarios.
The dBSeaRay solver forms a solution by tracing rays from the source to the receiver. A large number of rays leave the source covering a range of angles, and the sound level at each point in the receiving field is calculated by coherently summing the components from each ray.
The normal modes are calculated for each water depth, based on the sediment properties and water sound speed profile. The sound field is calculated by assuming that energy only travels outward from the source, and that energy is not passed between modes (adiabatic assumption), leading to coupled mode equations.
As an aid to the user, two rapid solvers (20 log and 10 log) are included for quick evaluation of problems.