Visualization of Free-Surface Velocity Field Over Strip Roughness by Surface Reflection Method

Key Points

• The study aims to clarify the interaction between surface flow conditions and internal flow structures under varying water depths.
• Applied surface reflection method using three laser beams on the water surface.
• Evaluated a flow field with significant water depth changes and hydraulic jumps.
• Incorporated surface shape information into traditional PIV (Particle Image Velocimetry) for velocity measurement.
• Visualized surface velocity distribution at locations with rapid water depth changes and wave jumps.
• Suggested effects of relative water depth on turbulence characteristics, including surface fluctuations and the Boussinesq phenomenon.

Abstract