Air and Water Flow in a Sealed, Ponded Vertical Soil Column

Touma, Jaoudat; Vachaud, G.; Parlange, Jean‐Yves

doi:10.1097/00010694-198403000-00008

Cited by 65 publications

(32 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, all the solutions of the flow equation presented here earlier, which assume that air can move freely within the porous medium and remain practically at atmospheric pressure so that its impact on the movement of water can be neglected, can be applied. However, under conditions of flood irrigation, intense rainfall, and soil column experiments, air can be compressed at the wetting front and beyond and reduce significantly the infiltration rate until it could find a way to escape and release that pressure buildup [Peck, 1965;McWhorter, 1971;Dixon and Linden, 1972;Vachaud et al, 1974;Touma et al, 1984;Wang et al, 1998]. Solving the problem of two-phase flow in porous medium presented an increased interest since oil can replace air in the two-phase definition and thus address practical issues related to the oil industry.…”

Section: Two-phase Flow In Porous Mediamentioning

confidence: 99%

Infiltration into soils: Conceptual approaches and solutions

Assouline

2013

Water Resources Research

222

115

View full text Add to dashboard Cite

[1] Infiltration is a key process in aspects of hydrology, agricultural and civil engineering, irrigation design, and soil and water conservation. It is complex, depending on soil and rainfall properties and initial and boundary conditions within the flow domain. During the last century, a great deal of effort has been invested to understand the physics of infiltration and to develop quantitative predictors of infiltration dynamics. Jean-Yves Parlange and Wilfried Brutsaert have made seminal contributions, especially in the area of infiltration theory and related analytical solutions to the flow equations. This review retraces the landmark discoveries and the evolution of the conceptual approaches and the mathematical solutions applied to the problem of infiltration into porous media, highlighting the pivotal contributions of Parlange and Brutsaert. A historical retrospective of physical models of infiltration is followed by the presentation of mathematical methods leading to analytical solutions of the flow equations. This review then addresses the time compression approximation developed to estimate infiltration at the transition between preponding and postponding conditions. Finally, the effects of special conditions, such as the presence of air and heterogeneity in soil properties, on infiltration are considered.

show abstract

Section: Two-phase Flow In Porous Mediamentioning

confidence: 99%

Infiltration into soils: Conceptual approaches and solutions

Assouline

2013

Water Resources Research

222

115

View full text Add to dashboard Cite

show abstract

“…It is generally assumed that the air present in the soil is free to escape and thus has no influence on the infiltration rate. However, infiltration into the soil is restricted if the soil air is not able to escape (Touma et al 1984;Culligan et al 2000). The presence of shallow water tables and soil physical conditions such as impermeable layers, or lateral obstructions may prevent soil air escaping, thereby significantly reducing infiltration rates.…”

Section: Convectionmentioning

confidence: 99%

A Review of the Movement and Fate of N2O in the Subsoil

Clough

Sherlock

Rolston

2005

Nutr Cycl Agroecosyst

146

108

View full text Add to dashboard Cite

Understanding the fate of N 2 O in the subsoil is important in accurately assessing the direct and indirect fluxes of N 2 O to the environment. The production, movement and ultimate fate of N 2 O in the subsoil are all poorly understood. Movement of N 2 O in the subsoil occurs predominantly via diffusion but convective fluxes can also occur. Diffusion gradients in the soil have been used to determine N 2 O surface fluxes with varying success. Infiltration of water into the soil may lead to entrapment, and the temporary storage of N 2 O, ebullition, or the transport of dissolved N 2 O in soil leachates. The reduction of N 2 O to N 2 is potentially enhanced when N 2 O is entrapped. Few studies have examined the effect of infiltrating water on a previously known N 2 O concentration in the soil. Future studies are required to better establish the consumption and movement of N 2 O in the subsoil during water infiltration. This paper reviews past work on the movement and fate of N 2 O in the subsoil and makes suggestions for future studies.

show abstract

“…This problem is reflected in the error sihgmd) detailed in Section 5.1 (Figure 8). Main drying curve (MDC) fitted to measured drying data (•) for sands n° 1, 3, 7 and 8 taken from Liakopoulos [1966], Poulovassilis [1970], Elmaloglou [1980] and Touma et al [1984] respectively. (65) over the measured MDC data points is of the same order of magnitude as the goodness of prediction calculated over the PWC data points (Table 3a).…”

Section: Water Content Scale Parametersmentioning

confidence: 99%

Soil water hysteresis prediction model based on theory and geometric scaling

Haverkamp

Reggiani

Ross

et al. 2002

Geophysical Monograph Series

View full text Add to dashboard Cite

Hysteresis in the water retention characteristic of a soil is important in predic tion of soil hydraulic properties and in description of vadose zone flow and transport processes. Although a number of models have been proposed, some are entirely empirical and others are inconvenient to use. We apply a theoretical ap proach to derive parameters for a more suitable model based on the concept of rational extrapolation. Considering the water retention curve to be described by three parameters, the first defining the shape of the curve and the two others scaling the soil water pressure head and volumetric soil water content, three geometrical scaling conditions are derived. The first condition determines a shape parameter which is identical for all wetting and drying curves and inde pendent of their scanning order; the second defines the relation between the pressure head scale and the water content scale specific to each curve in wetting or drying; and the third condition determines specific water content scale pa rameters according to the points of departure and arrival of each scanning curve. Equations necessary for the calculation of the different scale parameters are de rived. Given the saturated water content, all main, primary and higher order scanning curves can be predicted from knowledge of only one curve, although in practice knowledge of a main or primary curve is desirable. Constraints such as the need for scanning curves to be closed and to lie inside curves of a lower scanning order are automatically satisfied. The method is illustrated using the van Genuchten water retention function but could also be applied to other func tional forms. Results agree well with the existing data. It appears that knowledge 213 214 SOIL WATER HYSTERESIS PREDICTION MODEL of water retention in the field is often hampered by uncertainty in the hysteresis history of the soil. The model eliminates the residual water content as a soil characteristic parameter.

show abstract

Air and Water Flow in a Sealed, Ponded Vertical Soil Column

Cited by 65 publications

References 0 publications

Infiltration into soils: Conceptual approaches and solutions

Infiltration into soils: Conceptual approaches and solutions

A Review of the Movement and Fate of N2O in the Subsoil

Soil water hysteresis prediction model based on theory and geometric scaling

Contact Info

Product

Resources

About