“…Physically based geoacoustic models, such as the composite roughness model, have been developed to investigate the sediment‐acoustic relationship (APL‐UW, ; Fonseca et al, ; Hamilton, ; Jackson et al, ; Jackson & Briggs, ). Previous studies using these physical models demonstrated that sediment grain size properties and various substrate types can be distinguished based on their backscatter angular response curves (APL‐UW, ; Chakraborty et al, ; De & Chakraborty, ; Fonseca et al, ; Fonseca & Mayer, ; Haris et al, ). However, due to the large variability of seabed properties across the global oceans, one single geoacoustic model is not likely applicable to all cases (Hamilton, ; Hughes Clarke, ).…”