AN EXPERIMENTAL STUDY ON THE LOCAL SCOURING AROUND A CYLINDRICAL PIER AFFECTED BY DYNAMICAL CHANGE IN WATER LEVEL

Abstract

 Fomulas for estimating the maximum local scour depth, which is required for evaluating the stability of the bridge pier. Have been often proposed by experiments under constant water height conditions, and there are few research cases that reproduce the water level history. In this study, we have performed experiments which reproduced the water level history in river in order to verify an effect of repeated water level history on a progress of the local scouring.

 From these results of experiments, we show that local scour depth and local scour length are increased by the water level history, however those are tended to converge by repeating numbers of repetitions. In addition, we show that the local scour length at the upstream of the model is approximately 1.1 to 1.3 times larger than the value estimated from the local scour depth and the angle of repose in water.