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http://dx.doi.org/10.3741/JKWRA.2021.54.8.607

Applicability of hiding-exposure effect to suspension simulation of fine sand bed  

Byun, Jisun (Research Center for Smart Infra Construction, Chungnam National University)
Son, Minwoo (Department of Civil Engineering, Chungnam National University)
Publication Information
Journal of Korea Water Resources Association / v.54, no.8, 2021 , pp. 607-616 More about this Journal
Abstract
The purpose of this study is to simulate the transport of nonuniform sediment considering the hiding-exposure effect numerically. In order to calculate the transport of multi-disperse suspended sediment mixtures, the set of advection-diffusion equations for each particle class is solved. The applicability of the numerical model is examined by comparing the simulation results with experimental data. In this study, we calculate the vertical distribution of total concentration of sediment particles using two approaches: (1) by considering the mixture as represented by a single size; and (2) by combining the concentration of the sediment corresponding to several particle size classes; From the simulation results, it is shown that both approaches calculate reasonable results due to the narrow range of size distribution. Under the condition of nonuniform sediment, the critical shear stress of the sediment particle is influenced by the size-selective entrainment, i.e., hiding-exposure effect. It is shown in this study that the effect of hiding-exposure effect on the erosion rates of fine sand is negligibly small.
Keywords
Bed material; Size distribution; Hiding-Exposure effect; Fine sand; Sediment concentration;
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