Abstract
Flume experiments have been carried out under clear water scour conditions to analyze the maximum equilibrium scour depth and scour processes in armored streambeds. A total of 85 experiments have been carried out using different diameters of circular piers and non-uniform gravels. A graphical approach for dimensionless scour depth in equilibrium condition around the circular pier in armored streambeds has been developed. As per this curve, the maximum dimensionless scour depth variation with dimensionless armor particle size depends on the densimetric particle Froude number (Frd50), and the decreasing rate of dimensionless scour depth decreases with the value of Frd50.
Highlights
Scour around bridge elements like abutments and piers have been recognized as the main cause of bridge collapse [1]
Jueyi et al [11] conducted an experimental study for abutment scour in non-uniform gravel bed and proposed an empirical relationship to describe the maximum depth of scour at equilibrium state
It has been found that the maximum scour depth variation is higher for fine gravel beds (d50 = 3.26 − 4.94 mm) and lower for coarser gravel bed (d50 = 7.5 − 10.7 mm)
Summary
Scour around bridge elements like abutments and piers have been recognized as the main cause of bridge collapse [1]. The development of scour processes in non-uniform streambeds stops because of the development of a steady armor coating, due to the removal of fine sediment particles by the flowing water from the channel bed material (parent bed material) near the pier. Guo [15] and Kim et al [16] conducted pier scour study in non-uniform sediment and proposed maximum scour depth relationships They did not consider the armor layer in their study. Jueyi et al [11] conducted an experimental study for abutment scour in non-uniform gravel bed and proposed an empirical relationship to describe the maximum depth of scour at equilibrium state. Sketch of pier scour in armored bed for case (b), followed by Table 1
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
