Flow velocity field of the Saigon River section during operation of flood control structures

Introduction. Vietnam’s largest economic centre, Ho Chi Minh City, is facing riverbank erosion, one of the main causes which runoff. In this study, flow velocity field Saigon River section analyzed in different time periods. Materials and methods. Data on discharge, water level, river network topography channel were collected to set up simulation models programmes MIKE 11 21. These are tools used study. Results. The current middle 3–4 times higher than two banks. However, during period between high low tide, both sides has speed stream, especially upper part winding banks, such as from Ben Nghe sluice Tan Thuan An Loi Dong police station Thu Thiem 2 bridge. values studied most cases exceed allowable erosion-free particles material, suspended sediment particles. operation flood control sluices will slightly reduce also cause whirlpools front sluices. Conclusions. 21 software detailed distribution River. a complex varies depending discharge Dau Tieng Reservoir tidal currents East Sea. process erosion occur regularly continuously, so urgent measures needed protect riverbank.