Sedimentation transportation model in Soc Trang coastal area by grain size trend analysis method

Abstract

    The distribution of sediments in the coastal and estuary region is quite complicated. The sediments in these areas are influenced by many natural factors such as tidal regimes, inshore currents as well as pathways of sediment transport from the rivers. Spatial variation of particle size parameters may reflect sediment transport patterns and sedimentation dynamics environments. In this study, 169 samples of coastal surface sediments in Soc Trang province were collected using a specialized sediment grab and analyzed to evaluate the sediment distribution in this area. These samples were analyzed by the Laser diffraction analysis on Horiba LA-960V2. The proportion of sand and alluvium in the samples is 43.98% and 56.02%, respectively. In the sand composition, small sand accounted for 52% (0.125 - 0.25 nm), very small sand accounted for 48% (0.063 - 0.125 nm), and the average grain grade of the whole sample is 4.61(Φ). The fine-grained components are mainly concentrated along the coast and gradually coarser towards the sea. It shows that the coastal currents dominate and affect the coastal sediments in the study area