Abstract
The purpose of this study is to clarify the effect of the overflow falling height on the scour depth using physical experiments. Small-scale physical experiments were performed. The results indicate that the maximum scouring depth increases when the falling height of the overflow increases up to a given height. However, the maximum scouring depth decreases if the falling height is greater than the critical height because the diameter of the vortex decreases at such falling heights. The relation between the diameter of the vortex and the maximum scour depth is compared to the formula used in two previous studies. The scour depth determined in this paper is smaller than that estimated by the previously published formula. Thus, it is important to evaluate the velocity on the bottom for accurate estimation of the maximum scour depth.
