PROBABILISTIC APPROACH IN PREDICTION OF NON-UNIFORM SEDIMENT BED SURFACE UNDER EQUILIBRIUM FLOW CONDITION

Abstract

It is well known that transport of non-uniform sediment by running water leads to development of new bed surface. If clear water is flowing then there is coarsening of bed and formed bed is known as armor layer, but when sediment laden water flows, the complete mechanism changes, there is an exchange of sediments between bed surface and flowing water until equilibrium is formed, after which there won’t be any further exchange of sediments. However whenever there is change in the amount and type of sediment carried by the water a new equilibrium would be formed. In laboratory above condition is achieved by recirculating the sediment in the flume. In present work, an attempt has been made to estimate the grain size distribution of equilibrium bed surface if bulk grain size distribution, and flow properties are known. For developing this empirical model grain size distribution of equilibrium surface were statistically analyzed and fitted to standard probability distribution. further an e...