Mobilization and preferential transport of soil particles during infiltration: A core‐scale modeling approach

Abstract

[1] Understanding particle movement in soils is a major concern for both geotechnics and soil physics with regard to environmental protection and water resources management. This paper describes a model for mobilization and preferential transport of soil particles through structured soils. The approach combines a kinematic-dispersive wave model for preferential water flow with a convective-dispersive equation subject to a source/sink term for particle transport and mobilization. Particle detachment from macropore walls is considered during both the steady and transient water flow regimes. It is assumed to follow first-order kinetics with a varying detachment efficiency, which depends on the history of the detachment process. Estimates of model parameters are obtained by comparing simulations with experimental particle breakthrough curves obtained during infiltrations through undisturbed soil columns. Both water flux and particle concentrations are satisfactorily simulated by the model. Particle mobilization parameters favoring both attachment and detachment of particles are related to the incoming solution ionic strength by a Fermi-type function.Citation: Majdalani, S., E. Michel, L. Di Pietro, R. Angulo-Jaramillo, and M. Rousseau (2007), Mobilization and preferential transport of soil particles during infiltration: A core-scale modeling approach, Water Resour. Res., 43, W05401,

Sediment detachment and transport processes associated with internal erosion of soil pipes

“…rain interruption duration (RID). Majdalani et al () studied the RID effect and found that the initial peak increased with RID up to about 200 h. They also found that the magnitude of the initial concentration peak was linked to the water content of the macropore, and that particles collected during the peak were >10 μm whereas most of the particles at the tail were <1 μm. They attributed the dependence of particle detachment on RID to differential capillary stresses which serve to regenerate a pool of detachable particles on pore walls between events.…”

“…Majdalani et al () also applied the ADE to describe particle transport through macro‐porous soil and added a time dependent detachment rate, i.e. ‘detachment efficiency function’.…”

“…Sensitivity analysis suggested that the critical parameters for describing sediment transport through macropores were those associated with the particle filtering (Equation (7)). Majdalani et al (2007) also applied the ADE to describe particle transport through macro-porous soil and added a time dependent detachment rate, i.e. 'detachment efficiency function'.…”

Atomic‐Level Quality Assessment of Enzymes Encapsulated in Bioinspired Silica

“…Rapid infiltration during rainstorms also triggers water flow through macropores, which promotes the colloid transport in soils ( Poulsen et al, 2006; Vendelboe et al, 2011). A large fraction of transported colloids is released from the walls of the macropores ( Majdalani et al, 2007; Schelde et al, 2006), also pointing at the role of mechanical shear stress for the mobilization of colloids. An additional factor promoting the mobilization of colloids during rapid infiltration of water in macropores during heavy rainstorms is the rapid decrease of ionic strength ( Kretzschmar , 2005).…”

Tracing Water Flow and Colloidal Particles Transfer in an Unsaturated Soil

“…Several authors have shown the influence of this factor on the retention of colloidal particles e.g. [9]- [14] [20]. Attachment due to ionic strength is partially reversible.…”