The Hydraulic and Sedimentary Mechanism for the Dependence of Alternate Bar Height on Flow Discharge

Puntos clave

• The research aims to quantify the relationship between flow discharge and the development of alternate sandbar height using high-frequency measurements.
• Conducted model experiments for high-frequency measurement of riverbed dynamics.
• Analyzed the flow discharge dependence of the growth rate affecting bar height.
• Utilized time-series data and shallow flow analysis to quantify hydraulic parameters relating to bar mobility.
• The non-dimensional growth rate decreases as flow discharge increases, supporting existing linear stability theories.
• The response of growth rate to discharge changes was found to be less sensitive than theoretical predictions.
• Bar mobility decreases with a larger wave-to-depth ratio, highlighting the role of local erosion in promoting sandbar height development.