Abstract
A generalized method to determine maximum and temporal evolution of scour-depth at river structures, based on large range of data set from independent physical model studies, has been developed. A relative grain-size-like parameter referred to as alpha parameter was proposed. Likewise, a method was proposed to determine time factor in terms of a parameter, so called, sediment Strouhal number that can be employed as a similarity number in any time dependent phenomenon. It is evident that temporal development of local scour can widely be generalized using this parameter. Proposed method can be applied for structures protruding from the river bank (spurs, abutment etc) as well as pier-like structures. This method can be applied for live-bed scouring case as well. The method was verified using large range of laboratory data from independent investigations on maximum and temporal scour. Likewise, method was tested against field investigation on temporal scour development at pier during flood event.
