Estimating hydraulic conductivities of the soil aggregates and their clay-organic coatings using numerical inversion of capillary rise data

Fér, Miroslav; Kodešová, Radka

doi:10.1016/j.jhydrol.2012.08.037

Cited by 19 publications

(20 citation statements)

References 37 publications

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“…However, larger WDPT values measured at surfaces with coatings than those at uncoated surface were also associated with generally lower hydraulic conductivity of coatings (consisted of fine grained material) in comparison to hydraulic conductivity of aggregate interiors. Considerable differences between the hydraulic conductivities of aggregate coating and interiors were observed for soil aggregates taken from the same soil horizon by Fér and Kodešová (2012) and Kodešová et al (2012). Results of our measurements on dry soil samples showed a slightly different relationship between WDPT and PWI, than those results of Leue et al (2015), who observed a non-linear relationship between PWI and WDPT (R = 0.5, p < 0.001) for different types of preferential flow path surfaces.…”

Section: Wdpt Explained By Pwi Of Som At Aggregate Surfacescontrasting

confidence: 60%

“…Clay-organic coatings often cover aggregates and biopores in the clay-illuviation Bt-horizons of Luvisols (IUSS Working Group WRB, 2014). These coatings considerably restrict interactions between pores inside and outside of the aggregates (e.g., Fér and Kodešová, 2012;Gerke and Köhne, 2002;. Earthworm burrow walls can also be coated by the earthworm casts, which often have different soil chemical and physical properties than the bulk soil (Jouquet et al, 2008;Lipiec et al, 2015;Schrader et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…water flow and solute transport) between macropores (i.e., earthworm burrows and cracks) and the matrix domain (i.e. pores outside and inside of aggregates or biopore walls) is decreased mainly due to the lower permeability of fine-textured coatings, in comparison to that of aggregate interiors (Fér and Kodešová, 2012;Gerke and Köhne, 2002;Köhne et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Depths of soil horizons and basic soil properties determined on disturbed soil samples: oxidizable organic carbon content (C ox ), clay (<0.002 mm), silt (0.002-0.05 mm) and sand (0.05-2 mm) content, pH H2O , pH KCl , and specific density (ρ s ) (2010) documented (using DRIFT mapping) that coatings in this soil contain variable amounts of organic matter of different composition, which may influence the water infiltration rate. Fér and Kodešová (2012) showed that measured saturated hydraulic conductivities of aggregate coatings in the Bt2 horizon were one to two orders of magnitude lower than that of the soil aggregate interior. No statistically significant differences were found between saturated hydraulic conductivities obtained for coatings of various (clay-organic) compositions.…”

Section: Introductionmentioning

confidence: 99%

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Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Fér

Leue

Kodešová

et al. 2016

Journal of Hydrology and Hydromechanics

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Abstract:The organo-mineral coatings of soil aggregates, cracks, and biopores control sorption and macropore-matrix exchange during preferential flow, in particular in the clay-illuvial Bt-horizon of Luvisols. The soil organic matter (SOM) composition has been hypothesized to explain temporal changes in the hydraulic properties of aggregate surfaces. The objective of this research was to find relations between the temporal change in wettability, in terms of droplet infiltration dynamics, and the SOM composition of coated and uncoated aggregate surfaces. We used 20 to 40 mm sized soil aggregates from the Bt2 horizon of a Haplic Luvisol from loess that were (i) coated, (ii) not coated (both intact), and (iii) aggregates from which coatings were removed (cut). The SOM composition of the aggregate surfaces was characterized by infrared spectroscopy in the diffuse reflection mode (DRIFT). A potential wettability index (PWI) was calculated from the ratio of hydrophobic and hydrophilic functional groups in SOM. The water drop penetration times (WDPT) and contact angles (CA) during droplet infiltration experiments were determined on dry and moist aggregate samples of the three types. The decrease in the CA with time was described using the power function (CA(t) = at -b ). For dry aggregates, the WDPT values were larger for coated as compared to uncoated regions on the aggregate surfaces, and increased with increasing PWI value (R 2 = 0.75). The a parameter was significantly related to the WDPT (R 2 = 0.84) and to the PWI (R 2 = 0.64). The relations between the b parameter and the WDPT (R 2 = 0.61) and the PWI (R 2 = 0.53) were also significant. The WDPT values of wet soil aggregates were higher than those of dry aggregates due to high water contents, which limited the droplet infiltration potential. At the wet aggregate surfaces, the WDPT values increased with the PWI of the SOM (R 2 = 0.64). In contrast to dry samples, no significant relationships were found between parameters a or b of CA(t) and WDPT or PWI for wet aggregate surfaces. The results suggest that the effect of the SOM composition of coatings on surface wettability decreases with increasing soil moisture. In addition to the dominant impact of SOM, the wettability of aggregate surfaces could be affected by different mineralogical compositions of clay in coatings and interiors of aggregates. Particularly, wettability of coatings could be decreased by illite which was the dominant clay type in coatings. However, the influence of different clay mineral fractions on surface wettability was not due to small number of measurements (2 and 1 samples from coatings and interiors, respectively) quantified.

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Section: Wdpt Explained By Pwi Of Som At Aggregate Surfacescontrasting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Fér

Leue

Kodešová

et al. 2016

Journal of Hydrology and Hydromechanics

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“…The optimized saturated hydraulic conductivities of aggregate coatings were found to be one to two order of magnitude lower than the saturated hydraulic conductivities of the aggregates (Fér and Kodešová, 2012). Bartoli and Dousset (2011) found that the greater the apparent contact angle value, the smaller the water sorptivity value and the greater the proportion of water-stable aggregates.…”

Section: Introductionmentioning

confidence: 93%

Temperature influences water sorptivity of soil aggregates

Czachor¹,

Lichner²

2013

Journal of Hydrology and Hydromechanics

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Abstract:The aim of this study was to determine the potential development of water sorptivity of soil aggregates by heating. Soil aggregates were sampled from arable layer of 5 Polish soils: Haplic Luvisol 1 from Czesławice, Haplic Luvisol 2 from Wierzchucinek, Haplic Cambisol from Felin, Gleyic Mollic Cambisol from Chylice, and Haplic Phaeozem from Grabiec. Three aggregates of each soil type with minimum diameter between 4 and 10 mm were heated in the oven for at least 3 hours at temperatures 20, 100, 200, 250, and 360ºC. After each temperature treatment the soil aggregates were conditioned at the room temperature for 16 hours. Laboratory measurements of water sorptivity of soil aggregates were performed under a negative tension h 0 = -2 cm using tension infiltrometer. It was found that the exposure to temperatures between 100 and 200°C tends to decrease water sorptivity of aggregates from all the studied soils but one (Haplic Luvisol 1), followed by about two-to four-fold increase in water sorptivity for exposure to temperatures of 250°C (in Haplic Luvisol 1, Haplic Luvisol 2, and Haplic Phaeozem) or 360°C (in Haplic Cambisol and Gleyic Mollic Cambisol).

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Reasons for Filter Bag Failure and Method Development to Improve its Life Span

Patnaik

Anandjiwala

2016

Chem Eng & Technol

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Reasons for filter bag failure at steel plants were analyzed and a suitable approach to overcome such problems is proposed. Clean and used filter bags were tested to evaluate tensile and bursting strengths and air permeability properties. In order to simulate the behavior of the filter bags under acidic conditions normally encountered in actual working environment, an acid dew point test was conducted on the clean bags. The structural changes in all bags were determined by scanning electron microscopy. A significant reduction in tensile and bursting strengths was observed after acidic treatment. In order to improve the durability of the bags, they were coated with a mixture of acrylic binder and nanoclay. Commercial filter bags as well as the developed samples showed improved resistance without any failure behavior.

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Estimating hydraulic conductivities of the soil aggregates and their clay-organic coatings using numerical inversion of capillary rise data

Cited by 19 publications

References 37 publications

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Temperature influences water sorptivity of soil aggregates

Reasons for Filter Bag Failure and Method Development to Improve its Life Span

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