Hydraulic structures such as spur dyke or embankment are popular in river training engineering. The flow around hydraulic structures definitely has complicated three-dimensional nature and has been the subject of studies using numerical models. The current 3D model has been applying on many experiments in laboratory but the applicability to the real river is still in question. This paper shows some results of 3D simulation of flow around structure in a natural river. The original 3D model for bed sediment load was improved by including the suspended sediment in order to adapt with rivers in Vietnam then it was applied to a segment of Red river nearby Hanoi city.
