COMPARISON OF FOUR PARTICLE DEPOSITION RATE FORMULAE IN LAMINAR FLOW

Abstract

This research aimed to obtain the deposition rate in laminar flow for sediment traps. There are two essential variables related to the performance of the sediment traps for irrigation systems, namely the deposition rate and the efficiency of flushing. This research examines the rate of sediment deposition in laminar flow in a sediment trap. The fall velocity is a fundamental parameter in the modeling and interpretation of the deposition rate. As a rice-producing country, paddy fields with irrigation are many in Indonesia. The case study in this research is on the Macan weir in Subang district - West Java. The data of sediment properties in the Macan river obtained by field investigation from August to December 2019 are sediment concentration, water temperature, grain particle gradation, and the maximum discharge that enters the intake gate. The sediment transport rate that passes through this Macan weir was calculating in 2020. Non-cohesive type of sediment to be an exam in this study. A limitation of the sediment gradation to be captured >0.06cm and neglect <0.06cm and allowed to enter the irrigation system. The method of this research, to determining the sedimentation rate through various literature and formulae methods. Comparing deposition rates are the Stokes-Newton, Farag, Fergusson-Church, and Dietrich law equations. Compare it visually with the plots of equations for laminar conditions of non-cohesive sediment settling in the water at 20°C. As the first step in further research, the result is to determine the appropriate equation for the case that applies to this study.