Piv/PTV-Based Analysis of Sediment Dynamics Through Fixed Beds and a New Approach to Roughness Resistance Evaluation

Key Points

• The research aims to propose a method for evaluating roughness resistance in sediment flow on fixed beds.
• Utilized PIV and PTV techniques for comprehensive measurements of flow velocity and particle velocity.
• Supplied different grain sizes of silica sand to fixed beds for analysis.
• Quantified the relationship between grain size and equivalent sand roughness.
• Identified changes in equivalent sand roughness based on grain size relationships.
• Evaluated velocity differences and momentum loss of rising and descending particles.
• Presented potential for estimating new mechanical indicators like dynamic friction coefficients.