Study on Surface Velocity Coefficients and Measurement Line Configurations Based on Three-Dimensional Velocity Distributions in an Actual River

Key Points

• The study aims to evaluate the impact of surface velocity coefficient distributions and measurement line configurations on flood flow observations.
• Conducted three-dimensional turbulence calculations for initial analysis.
• Validated turbulence models against measurement results.
• Organized three-dimensional velocity distributions based on calculations.
• Performed pseudo flow observations using buoy measurements and electromagnetic flow meters.
• Analyzed effects of measurement configurations on flow rate values.
• Identified areas between bridge piers where surface velocity coefficients exceeded 0.90.
• Noted that the distribution of coefficients typically ranged from 0.85 to 0.90.
• Demonstrated the importance of considering appropriate measurement configurations for low velocity behind bridge piers.