Dam-break flow remains a classical problem among researchers. One area of focus is sediment transport associated with tsunamis. Since tsunamis can also be approximated as shallow water waves, dam-break models are frequently used in tsunami-related studies. In the present study, we investigated the effects of varying suspended sediment concentrations on dam-break flow using an image-based analysis approach. The analysis focused primarily on water surface elevation and sediment transport behavior at a specific observation point. The results indicate that the arrival time of the dam-break wave front was nearly identical across all sediment concentration cases, suggesting that water surface elevation dynamics are largely independent of the initial sediment concentration. Furthermore, the transport behavior of suspended sediment was examined. In most cases, the sediment concentration near the wave front was initially low but increased sharply shortly after wave propagation. This sudden rise is attributed to the high flow velocity induced by the steep water surface gradient, which enhanced the entrainment of suspended sediment into the advancing wave front.