Abstract
Flow characteristics, such as secondary currents, Reynolds stress and turbulence energy, in the cross-section of gradually shallowed open channel flows were investigated with a hot-film anemometer. The wake strength parameter II decreases in the flow direction. It was confirmed that the value of n is determined by the pressure gradient parameter β. An exponential function describing the relationship between ri and β is proposed. The strength of the secondary currents decreases along the flow direction. The shape of iso-velocity lines in a cross section looks like the rectangular shape. The Reynolds stress takes a negative value near the water surface in the vicinity of the side wall.
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