The settling velocity of sediment is one the essential parameters in studying freshwater reservoirs and transporting flowing water, mainly when suspension dominant process. Hence, their quantitative measurements are crucial. An error during prediction may be increased by a factor three or more estimation suspended load transport water. Despite its significance, obtaining real value situ practic...

introduction: for a velocity profile in turbulent flows, the flow conditions in the vicinity of the wall are described by logarithmic law of the wall. however, it has been extensively verified that the log-law does not apply in the outer region of the boundary layer. for example, in free surface flows, the law of the wall holds only for 20 percent of the flow depth from the wall. coles (1956) c...