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Title

MAXIMUM LENGTH OF SOLUTE DIFFUSION IN A PARABOLIC CHANNEL UNDER PERMEABLE AND IMPERMEABLE BED CONDITIONS

Pages

 Start Page 399 | End Page 410

Abstract

 Introduction: It is important to understand the processes of diffusion and transporting solute in the FURROW IRRIGATION system, because of their role in diffusion of pollutants in the environment. Movement pattern of fertilizer from the source ofplants is usually under the effect of advection and turbulent DIFFUSION PROCESSes.Maximum solute diffusion length (SDL) is the minimum distance which materials such as a fertilizer, could uniformly spread in the whole flow cross section. The SDL depends on hydraulic properties, condition of vegetation and channel specifications. Velocity profile of furrows as a result of parabolic shape of the crosssection is different thanthe rivers and rectangular channels. The main objectives of this study were to investigate SDL in a permeable parabolic channel and evaluate the effect of different discharges and bed roughness on diffusion length in a parabolic cross-section of a furrow. …

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