Decrease in hydraulic conductivity and particle release associated with self-filtration in saturated soil columns

Dikinya, Oagile; Hinz, Christoph; Aylmore, Graham

doi:10.1016/j.geoderma.2008.05.014

Cited by 63 publications

(35 citation statements)

References 36 publications

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“…The soil mineral composition and organic matter content were found to be the essential factors that determine the ease of fluid transport. In Rull soil the attractive forces between the particles (which are generally finer than in Altamira soil) are responsible for the interaction between organic matter and clay minerals (Dikinya et al, 2008), reducing the filtration and diffusion paths in soil. The higher SSA value for this soil, which is a consequence of its texture, mineral composition and organic content, is responsible for its lower infiltration rates, hydraulic conductivity and gaseous diffusion coefficient.…”

Section: Comparison Of Results: Differences Between Altamira and Rullmentioning

confidence: 99%

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Pla

Cuezva

Martı́nez-Martı́nez

et al. 2017

CATENA

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The soils above caves represent a membrane that regulates the connection between the underground environment and the outside atmosphere. In this study, soils from two different field sites (Cueva de Altamira and Cueva del Rull in Spain) are investigated. Field results are analysed and linked to laboratory tests. Several laboratory experiments are performed to quantify CO2 diffusion coefficients and water infiltration rates in these soils under different degrees of soil water saturation and compaction.Tests confirm that the grain size distribution, organic matter content, mineral composition and water content of soils affect gas transport through the soil pore network. Both field and lab results reveal that Altamira soil has a coarser texture and therefore has higher CO 2 diffusion coefficients, infiltration rates and hydraulic conductivity values than Rull soil. Rull soil contains a higher proportion of fine particles and organic matter, which explains the lower fluid transport coefficients.When soils are near saturation, fluid transport does not depend on the physical properties of soil but depends on the soil water content. In this state, liquid transport regulates the available space within the soil pores, which leads to a reduction in the gaseous diffusion coefficient of the soil. After rainfall episodes, the connection between the exterior atmosphere and underground cavities is hindered due to a rise in the soil water content, which is responsible for the closure of the overlying membrane. This study demonstrates that soil-produced CO2 reaches the underground atmosphere through diffusion processes that are controlled by the intrinsic properties of soil (porosity, grain size distribution, texture, mineralogy and organic matter content) and soil water content.

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Section: Comparison Of Results: Differences Between Altamira and Rullmentioning

confidence: 99%

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Pla

Cuezva

Martı́nez-Martı́nez

et al. 2017

CATENA

View full text Add to dashboard Cite

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“…With a siphon, undesired surface soil alteration should be reduced. A shortduration experiment was considered to prevent or, at least, reduce soil alteration due to possible occurrence of time-dependent selffiltration during the experiment (Dikinya et al, 2008).…”

Section: Laboratory Methodsmentioning

confidence: 99%

“…Beckwith et al (2003) suggested that a peat sample may not wet fully before the first measurement but may be closer to complete saturation before the second measurement. In addition, migration, rearrangement, and removal of soil particles within the porous medium (i.e., selffiltration) can significantly affect K s measurements (Dikinya et al, 2008). If self-filtration occurs, the K s measurement varies with the duration of the experiment and as a result the second measurement is conducted on a soil sample altered to some degree by the first measurement.…”

Section: Introductionmentioning

confidence: 99%

Testing laboratory methods to determine the anisotropy of saturated hydraulic conductivity in a sandy–loam soil

2009

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“…The same behavior also was pointed out by Bagarello et al [29] in long-time drainage experiments on small (0.001 m 3 ) undisturbed soil samples. Dikinya et al [36] observed that when water moved in two repacked soil columns, the hydraulic conductivities decreased up to one order of magnitude from the start until the shutdown of the flow experiments. These authors argued that this was due to particle mobilization and pore-clogging processes.…”

Section: Benefits Of the Proposed Field Soil K Sl Assessment Toolmentioning

confidence: 99%

Lateral Saturated Hydraulic Conductivity of Soil Horizons Evaluated in Large-Volume Soil Monoliths

Pirastru

Marrosu

Prima

et al. 2017

Water

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Abstract:Evaluating the lateral saturated hydraulic conductivity, K s,l , of soil horizons is crucial for understanding and modelling the subsurface flow dynamics in many shallow hill soils. A K s,l measurement method should be able to catch the effects of soil heterogeneities governing hydrological processes at the scale of interest, in order to yield K s,l representative values over large spatial scales. This study aims to develop a field technique to determine spatially representative K s,l values of soil horizons of an experimental hillslope. Drainage experiments were performed on soil monoliths of about 0.12 m 3 volume, encased in situ with polyurethane foam. Median K s,l of 2450 mm·h −1 and 552 mm·h −1 were estimated in the A and B horizon, respectively. In the upper part of the B horizon, the median K s,l was 490 mm·h −1 , whereas it mostly halved near the underlying restricting layer. The decline of K s,l values with depth was consistent with the water-table dynamics observed at the same site in previous studies. Moreover, the K s,l from the monoliths were in line with large spatial-scale K s,l values reported from the hillslope in a prior investigation based on drain data analysis. This indicated that the large-scale hydrological effects of the macropore network were well represented in the investigated soil blocks. Our findings suggest that performing drainage experiments on large-volume monoliths is a promising method for characterizing lateral conductivities over large spatial scales. This information could improve our understanding of hydrological processes and can be used to parameterize runoff-generation models at hillslope and catchment scale.

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Decrease in hydraulic conductivity and particle release associated with self-filtration in saturated soil columns

Cited by 63 publications

References 36 publications

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

Testing laboratory methods to determine the anisotropy of saturated hydraulic conductivity in a sandy–loam soil

Lateral Saturated Hydraulic Conductivity of Soil Horizons Evaluated in Large-Volume Soil Monoliths

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