Author(s): Zhongyi Lu; Zhengrong Gao; Jianwei Huang
Linked Author(s):
Keywords: Estuary; Pier; Local scour; Influence
Abstract: The foundation of large bridge piers in a estuary suffers not only from the influence of deep water, rapid currents and the variety of topography but also the action of runoff and tidal currents. It makes local scour around bridge piers more complex than those occurred in upstream river reaches. This paper presents an investigation on the local scour caused by large bridges near the Changjiang River estuary by using series of physical model experiments on both unidirectional stable currents and tidal currents. Main factors influencing the depth, shape and range of local scour of the bridge piers in the estuary were discussed, including: 1) The influence of angle of attack on the scour depth; 2) The influence of submerged angle of repose on the scour length; 3) The influence of property of stratum layers of riverbed on the scour depth; 4) The impact of tidal and unidirectional currents on the scour depth.
Year: 2004