Project Title: Wave-driven transport of sand-mud mixtures
Doctoral Candidate: Van Thi To NGUYEN
Project Description: This research project aims to study the transport and bedform of sand–silt mixtures under
oscillatory flows. Knowledge of sand–silt mixture dynamics, especially under wave effects, is still limited, even though many coastal systems worldwide are silt-dominated (e.g., Mekong Delta, Yangtze Delta, Yellow River Delta). To improve our understanding, a laboratory experiment was conducted in a full-scale oscillatory tunnel using various sand–silt mixtures. Two silt fractions (D 50 = 30 µm and 50 µm) were mixed with sand (D 50 = 150 µm) at 20% and 40% silt content to investigate the effects of grain-size ratio and silt content on bed characteristics and transport processes. To quantify transport and bedform evolution, acoustic and optical instruments were used (e.g., Acoustic Doppler Velocity Profiler, Acoustic Backscatter Sensor, Laser Bed Profiler). This study provides valuable data and insights for sediment transport research, particularly for mixed sediments, and is essential for future coastal morphology modelling.