Normandie UNIV, UNIHAVRE, UMR 6294 CNRS, LOMC, 76600 Le Havre, France.
Normandie UNIV, UNIHAVRE, UMR 6294 CNRS, LOMC, 76600 Le Havre, France.
Environ Pollut. 2018 Jun;237:1011-1022. doi: 10.1016/j.envpol.2017.11.017. Epub 2017 Nov 11.
A time-distance-dependent deposition model is built to investigate the effects of hydrodynamic forces on the transport and deposition of polydispersed particles and the evolution of deposition rates with time and distance. Straining and the heterogeneity of the particle population are considered to play important roles in the decreasing distribution of deposition rates. Numerical simulations were applied in a series of sand column experiments at different fluid velocities for three different porous media. The effects of hydrodynamics forces are elaborated with the systematic variations of deposition dynamic parameters of the proposed model. With retention distributions with particle size as well as temporal and spatial evolutions of deposition rates, the transport and deposition mechanisms of polydispersed particles will be elucidated through the interplay of the variation of the particle size distribution of mobile particle populations and the geometrical change of the porous medium due to retention (straining and blocking).
建立了一个时距相关的沉积模型，以研究水动力对多分散颗粒输运和沉积的影响，以及沉积速率随时间和距离的演化。应变和颗粒群的非均质性被认为在沉积速率的递减分布中起着重要作用。数值模拟应用于在不同流速下的一系列砂柱实验中，针对三种不同的多孔介质。通过系统地改变所提出模型的沉积动力学参数，详细阐述了水动力的影响。通过移动颗粒群的粒径分布变化和由于保留（应变和阻塞）导致多孔介质的几何变化之间的相互作用，结合粒径分布的保留分布以及沉积速率的时空演化，阐明了多分散颗粒的输运和沉积机制。
