Establishing a mixed sediment transport model based on simulation space of morphological changes of the mainstream at Soai Rap estuary by Telemac-2D

Abstract

Establishing a sediment transport model with spatial complex variation of characteristics of sediment is a matter for research in the sediment dynamics and estuary morphology. By taking advantage of open source mathematical model Telemac, the study changed the riverbed structure suitable for physical
characteristic by imposing the value (ES1, ES2) = f (f1, f2, n, ES) to transport simulation mixed sediment in the river and non-cohesive sediment outside the sea apply to Soai Rap estuary. The model was established with high reliability and errors in the content of suspended sediment MSE were from 0.001 - 0.013. Simulation results after 1 year show that, at the Soài Rạp estuary, in the middle of the mainstream there are erosion pits with the depth of erosion from 0.3 to 1.0 m; that erosion is carried far from the sea by the flow and forming sand dunes with an accretion height of 0.3 - 0.4m.