Formation of borders in porous media during evaporation and their influence on permeability

Goldenberg, Lior C.; Hutcheon, I. D.; Melloul, A.

doi:10.1016/0022-1694(92)90155-o

Cited by 6 publications

(5 citation statements)

References 35 publications

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“…Visualization experiments at the pore scale in micromodels mimicking a porous medium (Sirivithayapakorn & Keller, 2003;Auset et al, 2005) are consistent with this hypothesis: when water films become thinner than colloid size, trapped colloids become irreversibly attached to the surface water interface. (ii) As their concentration in the remaining water films increases, clay (Goldenberg et al, 1992;Singer et al, 1992;Ghezzehei & Or, 2000), salt and minerals (Santamarina, 2002) precipitate and form and strengthen inter-particle bridges. If rain is resumed at this stage, the new infiltration front acts on increasingly reinforced structures and mobilization decreases.…”

Section: Mobilization Mechanismmentioning

confidence: 99%

Effects of wetting and drying cycles on in situ soil particle mobilization

Majdalani

Michel

DiPietro

et al. 2008

European J Soil Science

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International audienceUnderstanding particle mobilization and transport in soils is a major concern for environmental protection and water resource management as they can act as vectors for sorbing pollutants. In natural soils, the existence of a finite size and renewable pool of dispersible particles has been hypothesized. Even though freeze-thaw and wetting-drying cycles have been identified as possible mechanisms of pool replenishment between rainfall events, to date the underlying phenomena ruling the renewal of particle pools are still largely unexplored. We carried out a series of infiltration-drainage experiments to study systematically the effects of periods without rain (pauses) on in situ particle mobilization in undisturbed soil columns. We found that, for a given column, pause duration between two rainfall events has a major influence on subsequent particle mobilization: the mass of leached particles increases with pause duration until it reaches a maximum (mass for a 200-hours pause is 15 time greater than for a 1-hour pause), and then it decreases for even longer pauses. This behaviour was correlated with soil water content, and can be explained by soil matrix weakening due to differential capillary stresses during drying. The consequences of this finding are important because the 15-fold increase in mass of leached particles, when pause duration is changed from 1 hour to 4 days, might overwhelm variations caused by changes in other parameters such as the ionic strength of the incoming solution or the rainfall intensity

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Section: Mobilization Mechanismmentioning

confidence: 99%

Effects of wetting and drying cycles on in situ soil particle mobilization

Majdalani

Michel

DiPietro

et al. 2008

European J Soil Science

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“…Changes in chemical composition of interstitial waters caused by wetting and drying of a soil can exert a very strong influence on particle mobilization (e.g., ref 6). Furthermore, drying of soil leads to creation of air-water interfaces to which particles adhere strongly (e.g., refs 9-12) and can lead to clay structures from which the water eventually withdraws (13). Upon rehydration by chemically dilute infiltrating water, the particle aggregates can be destabilized and the resulting fine particles mobilized.…”

Section: Introductionmentioning

confidence: 99%

Mobilization and Transport of Soil Particles during Infiltration Experiments in an Agricultural Field, Shenandoah Valley, Virginia

El-Farhan

DeNovio

Herman

et al. 2000

Environ. Sci. Technol.

125

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Evidence that fine particles mobilized and transported in soils and aquifers can have a profound influence on contaminant migration has spawned much interest recently in understanding colloid transport in natural materials. Repeated infiltration experiments on an initially dry field soil were conducted to evaluate rates of mobilization of fine particles over time and to investigate the importance of transient-flow events on particle transport. Water flow was measured in zero-tension lysimeters at 25 cm depth. For repeated infiltration events and for all plots, water flow sharply increased shortly after initial ponding of water at the soil surface, maintained a relatively steady level during the period of ponding, and decreased gradually thereafter. Particle concentrations measured in the pan lysimeters ranged from 7 mg L -1 to 265 mg L -1 and were typically on the order of 10 to 100 mg L -1 . Greatest particle mass flux was observed during the initial infiltration experiment on each plot. During four subsequent infiltration experiments, all conducted within 250 min of the first event, steady mass fluxes were observed that were approximately 70% of the average value seen in the first flush of water through a dry soil, indicating that the supply of mobile soil particles is only sparingly reduced over closely spaced infiltration events. All peak particle concentrations and mass fluxes occurred near either the rising limb or the falling limb of the water flux hydrograph, presumably reflecting the movement of air-water interfaces during imbibition and drainage. ES991099G FIGURE 5. Particle mass fluxes and measured water flow rates for the 20-cm infiltration event in Plots 4 and 6. The solid circles (-•-) represent particle mass fluxes, and the lines represent the flow rates. These two individual experiments are illustrative examples selected from the entire set of results shown in Figure 4.

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“…(1) Controlled laboratory experimental simulations of the processes that occur at the gas-liquid interface-involving flow of fluid suspensions through sandy sediments and/or isotropic glass micromodels of the pore system (Goldenberg et al, 1992. The aim of these experiments was to monitor changes in flow characteristics during cycles of hydration-drying-hydration under conditions simulating those of the vadose zone of aquifers.…”

Section: Methodsmentioning

confidence: 99%

“…Reduction of the permeability (or hydraulic conductivity, Darcy's K) of the sandy sediments, relative to K original , was observed in all samples examined. For the studied mixtures of clay and sand, it was found (Goldenberg et al, 1992) that:…”

Section:   :    mentioning

confidence: 98%

“…Microscopic examination conducted during these studies (Goldenberg et al, 1992) revealed that clay particles originally in the solution accumulate and form structures on the gas-liquid interface that appear in the porous media during water evaporation. As a result of this particle rearrangement, the flow of fluids was reduced by 10-85%, depending on the mineralogical composition of the sediment.…”

Section:   :    mentioning

confidence: 99%

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