Author(s): Jian Hao Hong, Rajkumar V. Raikar, Anand R. Deshmukh, Wen Dar Guo
Linked Author(s): Jian-Hao Hong
Keywords: abutments, scour, sediment transport, unsteady flows
Abstract: A semi-empirical model is proposed to compute the time-dependent scour depth at rectangular/vertical wall abutments under unsteady clear-water flow conditions. The parameters used in this model include flow shallowness, flow intensity, sediment coarseness, and time factor. The experiments were conducted only for time-dependent scour depth under unsteady flows at three types of abutments, namely rectangular/vertical wall, semi-circular and trapezoidal/450 wing-wall abutments in uniform sediments under unsteady clear-water conditions. Based on the superimpose concept and the correction of shape factor for different types of abutments, the proposed model is adopted to compute the temporal variations of rectangular/vertical wall, semi-circular and trapezoidal/450 wing-wall abutments scour depth under clear-water with unsteady flow conditions. It was found that the proposed model corresponds well with the data of time-dependent scour depth in uniform sediments obtained from the present experiments (unsteady flows) and reported by different investigators (steady flows)
Year: 2017