Usually the parameters of importance are: acousic frequency sound speed profile, depth of source and receiver, characteristics of the pulse (short CW,... [more]
Usually the parameters of importance are: acousic frequency sound speed profile, depth of source and receiver, characteristics of the pulse (short CW, LFM, etc) height of water column, material composition of the sea bed and the waves at the air/sea interface. The Deep Sound Channel is a special case because the sound energy is "trapped" by both upward and downward refraction. Consequently the sound does not interact with the air/sea interface or the sea bed and spherical spreading does not describe the expansion (propagaton) of the phase fronts. There is an Acoustic Tool Box,which was developed by University of Washington Applied Physics Laboratory, that you might refer to for additional detai;s like whether you should base the model on ray paths or modal propagation.