Author(s): Nguyen Quoc Y; Le Thanh Thuan; Tra Nguyen Quynh Nga; John C. Wells
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Keywords: Saigon River; Physical hydraulic model; Secondary flows; ADV
Abstract: Saigon River, in the south of Vietnam, is suffering severely from bank erosion and failure. A number of efforts, including academic researches, have been put to prevent the failure but limited success has been achieved. Contributing to understand the failure mechanism, we have been conducting a study on effects of flow patterns on the bank erosion and failure. Particularly, we are focusing on the secondary flows in the curved portions of the river. Both experiments and numerical computations are conducted. This paper reports the experimental study. A physical hydraulic model of the river portion around Thanh Da peninsula was built at scales of 1:500 and 1:100 in the horizontal and vertical directions, respectively. The Froude number was near 0.1. Flow depths and flow velocities in the model were examined by a depth gauge and a 3D (three-dimensional) Acoustic Doppler Velocimeter (ADV). The ADV measured streamwise velocity along the model and sectional flowfields at different flowrates. From the measured data, effects of secondary flows on river bank and bed erosion was discussed.
Year: 2014