Efecto de un aro sobre la socavación en pilas circulares

Abstract

In this paper an experimental study in order to analyze the effect of using a collar around a circular pier as device for controlling the depth of scour was made. Experiments were conducted using a circular pier of 7.3 cm diameter and two collars of different size. In the first stage a collar of 14.6 cm diameter was placed around the pier and, subsequently, a collar of 21.9 cm was used. The collar was placed at different positions with regard to the bed level. In each experiment the profile of the scoured bed, upstream and downstream of the pier was measured. This allowed to determine the maximum scour depth and to study the influence of the size and the position of the collar on the size and form of the scour hole. From the experimental information it is showed that the profiles of the scoured holes are similar in nature independently of the size and the position of the collar. It is found that when the collar is placed at the bed level the minimum depth of scour is produced. It is also obtained that the scour depth is reduced when the diameter of the collar is increased. The results are contrasted with the available little information in previous studies.