Over the recent years, a number of studies in nearshore sediment transport have been researched but a greater understanding of soil-hydrodynamic interaction has still paramount importance. A series of 2D small-scale physical experiments were performed at the University of East London (UEL) hydraulics laboratory to investigate the influence of flow and sediment properties on soil scour. Measured sediment and flow data were used to develop a simple empirical relationship for scour rate of each crescent zone with the help of dimensional analysis and best-fit technique under smooth bed condition. The proposed paper discusses the extended investigation on soil-hydrodynamic behaviour by increasing the mobile bed roughness to greater values used in earlier experiments by the authors to better understand sediment particle sorting mechanism and their spreading characteristics during scour. Eventually, the proposed experimental work will lead to the comparison, calibration and development of predictive curves of scour rate for different soils of each developing crescent zones
