The first model is associated with a forearc basin formed with little to no sediment supply. Conversely, the second model is associated with sediment supply. Topographic depressions which are accretionary and nonaccretionary in nature will depend on the supply of oceanic plate sediments, continentally derived clastic material and orthogonal convergence rates.[1][2] The accretionary flux (sediment supply in and out) also determines the rate at which the sedimentation wedges grow within the forearc.[1]