Dual-domain solute transfer and transport processes: evaluation in batch and transport experiments

Haws, Nathan W.; Das, Bhabani S.; Rao, P. Suresh C.

doi:10.1016/j.jconhyd.2004.07.001

Cited by 60 publications

(43 citation statements)

References 44 publications

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“…HPLC chromatography with an ultraviolet-visible detector was used to analyze PFB (Haws et al, 2004). Ammonia concentration was measured using the titrimetric method.…”

Section: Description Of the Column Experimentsmentioning

confidence: 99%

Application of pig slurry to soils. Effect of air stripping treatment on nitrogen and TOC leaching

Bolado

García-Sinovas

Álvarez-Benedí

2010

Journal of Environmental Management

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“…HPLC chromatography with an ultraviolet-visible detector was used to analyze PFB (Haws et al, 2004). Ammonia concentration was measured using the titrimetric method.…”

Section: Description Of the Column Experimentsmentioning

confidence: 99%

Application of pig slurry to soils. Effect of air stripping treatment on nitrogen and TOC leaching

Bolado

García-Sinovas

Álvarez-Benedí

2010

Journal of Environmental Management

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“…This is the case for materials consisting of nonporous particles such as sand and gravel [1][2][3][4] and materials that consist of porous particles. [5][6][7][8][9][10][11][12][13] In granular porous media, the gasfilled pore size distribution is strongly dependent on porous media particle size distribution. Particle size distribution is further much simpler to measure than gas-filled pore size distribution and is therefore most often used to characterize nonaggregated porous media.…”

Section: Introductionmentioning

confidence: 99%

Gas Dispersion and Immobile Gas Volume in Solid and Porous Particle Biofilter Materials at Low Air Flow Velocities

Sharma

Poulsen

2010

Journal of the Air & Waste Management Association

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Gas-phase dispersion in granular biofilter materials with a wide range of particle sizes was investigated using atmospheric air and nitrogen as tracer gases. Two types of materials were used: (1) light extended clay aggregates (LECA), consisting of highly porous particles, and (2) gravel, consisting of solid particles. LECA is a commercial material that is used for insulation, as a soil conditioner, and as a carrier material in biofilters for air cleaning. These two materials were selected to have approximately the same particle shape. Column gas transport experiments were conducted for both materials using different mean particle diameters, different particle size ranges, and different gas flow velocities. Measured breakthrough curves were modeled using the advection-dispersion equation modified for mass transfer between mobile and immobile gas phases. The results showed that gas dispersivity increased with increasing mean particle diameter for LECA but was independent of mean particle diameter for gravel. Gas dispersivity also increased with increasing particle size range for both media. Dispersivities in LECA were generally higher than for gravel. The mobile gas content in both materials increased with increasing gas flow velocity but it did not show any strong dependency on mean particle diameter or particle size range. The relative fraction of mobile gas compared with total porosity was highest for gravel and lowest for LECA likely because of its high internal porosity.

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“…The 10-cm soil layer under HPWV treatment contained 2 456 and 280 paths with these features; this count exceeded that in the soil under LPWV treatment. This finding indicates that the preferential flow paths are closely related to soil moisture connectivity (Haws et al 2004).…”

Section: Quantities Of Preferential Flow Paths In Horizontal Profilesmentioning

confidence: 62%

Application of the method of spatial point pattern analysis to the horizontal spatial distribution of preferential flow paths

Lu¹,

Cheng²,

Wang³

et al. 2015

The Forestry Chronicle

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Preferential flow significantly influences hydrological processes in forests. The occurrence and development of this flow is directly affected by its spatial distribution. To determine whether or not point pattern analysis method can be used to examine the horizontal spatial distribution of preferential flow paths, experiments were conducted with dye tracer permeation to observe flow processes. Results indicated that an increase in penetration water volume exerted only a specific effect on preferential flow paths of large class in the topmost soil. Moreover, such paths showed distinct clumped patterns at the 25-cm scale under both high permeation water volume and low permeation water volume treatments. Nonetheless, the distribution pattern became uniform as scale range increased. The significance of the correlation between the spatial distribution of preferential flow paths and plant roots decreased from the top soil layer to the bottom. These findings suggest that soil depth and water permeation volume are important to the horizontal spatial distribution of preferential flow paths. Moreover, point pattern analysis method is suitable for investigating the horizontal spatial distribution of preferential flow paths and determining the correlation between the spatial distribution of preferential flow paths and plant roots.Key words: preferential flow paths, brilliant blue dye tracing, spatial point pattern analysis RESUME L' écoulement préférentiel influence de façon significative les processus hydrologiques du milieu forestier. L' occurrence et le développement de cet écoulement est directement affecté par sa distribution spatiale. De façon à déterminer si oui ou non l'analyse du motif de points peut être utilisée pour étudier la distribution spatiale horizontale des réseaux d' écoule-ment préférentiel, des essais de diffusion ont été réalisés au moyen de colorants traceurs afin de suivre les processus d' écoulement. Les résultats ont indiqué qu'une augmentation du niveau de pénétration de l' eau exerçait un effet spécifique seulement sur les réseaux d' écoulement préférentiel de grande envergure situés dans le sol de surface. De plus, ces réseaux ont affichés des schémas agrégatifs distincts à l' échelle de 25 cm à la fois en présence d'un fort volume d' eau de pénétra-tion et d'un faible volume d' eau de pénétration. Néanmoins, le schéma de distribution est devenu uniforme avec l'augmentation de l' échelle. L'importance de la corrélation entre la distribution spatiale des réseaux d' écoulement préférentiel et les racines des plantes diminuait à partir de la couche de sol superficiel vers le bas. Ces observations indiquent que la profondeur du sol et le volume d' eau de pénétration sont importants au niveau de la distribution spatiale horizontale des réseaux d' écoulement préférentiel. De plus, l'analyse du motif par points permet l' étude de la distribution spatiale horizontale des réseaux d' écoulement préférentiel et de déterminer la corrélation entre la distribution spatiale des réseaux d' écoulement ...

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Dual-domain solute transfer and transport processes: evaluation in batch and transport experiments

Cited by 60 publications

References 44 publications

Application of pig slurry to soils. Effect of air stripping treatment on nitrogen and TOC leaching

Application of pig slurry to soils. Effect of air stripping treatment on nitrogen and TOC leaching

Gas Dispersion and Immobile Gas Volume in Solid and Porous Particle Biofilter Materials at Low Air Flow Velocities

Application of the method of spatial point pattern analysis to the horizontal spatial distribution of preferential flow paths

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