Estimation of Bottom Shear Stress by Piv Measurement For Wide Range of Flow Conditions

River maintenance via cement- and concrete-based methods is durable and economically feasible; however, these methods are considered to have an adverse effect on the environment. Thus, increasing environmental destruction owing to extreme weather conditions has necessitated the emergence of construction methods that support and preserve river environments. This study was aimed at developing an improved measurement methodology to evaluate the performance of river structures. The experiments were carried out using a high-speed open channel, and the flow velocities in a channel wall were measured using particle image velocimetry (PIV). Additionally, the bottom shear stresses were measure using a shear stress measuring device, and the water level data was obtained using a flow and ultrasonic water level gauge. The Reynolds stresses were calculated using PIV information and compared to the reach-averaged shear stresses and the values measured using the shear plate. The Reynolds stresses were verified to be consistent with the results of the reach-averaged equation. These values were used to validate the shear plate results and determine the applicable range of shear stresses for different configurations of the system. In this study, Reynolds stress was measured using velocity profile in a normalized experimental facility. The newly developed device also introduces the device through comparison with Reynolds stress, reach average shear stress