Use of ground-penetrating radar to investigate refilled scour holes at bridge foundations

Scour and removal of sediments and bed materials supporting bridge foundations has caused the collapse of many bridges that crossed streams and rivers (Jarrett and Boyle, 1986; Murillo, 1987). The rate and amount of scour depends on sediment type and transport, depth and velocity of the water, and obstructions to flow (Richardson and Richardson, 1989).