The Effect of Air Entry Values on Hysteresis of Water Retention Curve in Saline Soil

Konyai, Supasit; Sriboonlue, Vichai; Trelo-ges, Vidhaya

doi:10.3844/ajessp.2009.341.345

Cited by 24 publications

(12 citation statements)

References 11 publications

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“…The new formula is numerically identical to the maximum deviation between efFective saturations of the primary drainage and imbibition curves, which has been used as an index for hysteresis previously (Zhuang et al, 2008;Konyai et al,, 2009). According to this formula, the two important variables that determine degree of hysteresis are the n parameter (which is related to the spread of the water retention curve) and the ratio a = Ctj/OL^.…”

Section: Discussionmentioning

confidence: 99%

“…This means that the H index introduced in this paper, which conceptually represents the entire range of hydraulic capacity, is numerically identical to the index based on the maximum water-content deviation (//^) (Zhuang et al, 2008;Konyai et al, 2009). …”

Section: Theoretical Considerationsmentioning

confidence: 97%

“…The second approach defines the degree of hysteresis as the maximum deviation in effective saturation between the drainage and wetting curves H¿ = max (0¿-0 J (Zhuang ct al., 2008;Konyai et al, 2009).…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…To illustrate how the proposed degree of H can be used in evaluating the hysteretic feature of various soils, drainage and imbibition water retention data were obtained from the UNSODA database of unsaturated soil hydraulic properties (19 soils) (Nemes et al, 1999) and other published research articles (14 soils) (Maqsoud et al, 2004;Yang et al, 2004;Konyai et al, 2009). The texture of these soils ranges from clay loam to coarse sand and gravely sand.…”

Section: Illustrative Examplesmentioning

confidence: 99%

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An Index for Degree of Hysteresis in Water Retention

Gebrenegus

Ghezzehei

2011

Soil Science Society of America Journal

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Direct characterization of hysterciis in water retention (WR) is typically cumbersome and time consuming. Thu.s. such data are scarce, and even when available arc typically ignored in unsaturated flow modeling. One reason for disregard of this ubiquitous and significant feature of WR is lack of a universally applicable index for the degree of hysteresis that allows a priori assessment of its effect on flow. In this note we show that the mismatch between the hydraulic capacity functions of the primary drainage and imbibition curves can serve as generalized index for degree of hysteresis [H). Moreover, we showed that hysteresis indices of a broad range of soils are linearly related with the natural-logarithm of the van Genuchten n parameter (r^ = 0.73). Ulis model allows predicting the degree of hysteresis and the missing hysteresis branch using only wetting or drying water retention data. The robustness of the proposed index was illustrated by comparing it with error in simulated moisture redistribution in a horizontal column that arises from ignoring hysteresis. HYSTERESIS IN WATER RETENTION by porous media refers to the different values in the equilibrium water content at any given water potential depending on wetting and drying history (e.g., Hillel, 1998).Hysteretic soil water retention is typically characterized by major drainage (imbibition) curves that signify monotonie removal (addition) of water from (to) completely saturated (dry) porous media. Scanning loops that connect the major curves represent reversal in the direction of wetting or drainage at intermediate wetness. Major causes of hysteresis are considered to be: the variation in contact angle at different wetting and drying cycles, entrapped air in a newly wetted soil, temperature, swelling and shrinking, and ink-bottle effect due to nonuniformity in shape and sizes of both individual pores and interconnected pore networks (Bachmann and van der Ploeg, 2002: Dullien, 1992: Maqsoud et al., 2004: Or and Wraith, 1999.Field and laboratory methods for characterizing hysteresis in water retention are both time consuming and complicated, resulting in rather limited availability of directly measured hysteretic water retention data. To overcome this limitation, several researchers have developed physical and empirical models for predicting one branch of the water retention relation (in most cases wetting curve) and scanning loop.s based only on one main branch (typically the drying curve) (Braddock et al.

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Section: Discussionmentioning

confidence: 99%

Section: Theoretical Considerationsmentioning

confidence: 97%

Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Illustrative Examplesmentioning

confidence: 99%

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An Index for Degree of Hysteresis in Water Retention

Gebrenegus

Ghezzehei

2011

Soil Science Society of America Journal

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“…One is given by SHARMA and MOHAMED [17] and the other by KONYAI et al [16]. The drainage− imbibition cycle of interest and the primary drainage− main imbibition cycle were both taken into consideration in the KONYAI method, rather than only the former cycle in the SHARMA method.…”

Section: Hysteresis Under Consecutive Drainage and Imbibition Cyclesmentioning

confidence: 99%

Hysteresis of saturation-capillary pressure relations under consecutive drainage-imbibition cycles in fine sandy medium

Xie¹,

Li²,

Xia³

et al. 2012

J. Cent. South Univ. Technol.

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The hysteresis of saturation−capillary pressure (S−p) relations was investigated in a fine sandy medium under consecutive drainage−imbibition cycles, which resulted from scheduled water level fluctuations. A drainage−imbibition cycle starts with a drainage process and ends with an imbibition process in sequence. The saturation and capillary pressure were measured online with time domain reflectometry (TDR) probes and T5 tensiometers, respectively. Results show that the relation between the degree of hysteresis and the number of the drainage−imbibition cycles is not obvious. However, the degree decreases with the increase of the initial water saturation of the imbibition processes in these drainage−imbibition cycles. The air-entry pressure of a sandy medium is also found to be constant, which is independent of the drainage−imbibition cycles and the initial water saturation of the drainage process. In all the imbibition processes, parameter α of the van Genuchten (VG) model decreases with the increase of the initial water saturation, which corresponds positively to the magnitude of the hysteresis.

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No‐till cover crop effects on the hydro‐physical properties of a silt loam

Lieskamp,

Moseley,

Legrain

et al. 2024

Soil Science Soc of Amer J

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Soil hydraulic and physical properties can be influenced by various land management practices, and they determine water movement and storage within the vadose zone, with both agronomic and environmental effects. The objective of this study was to evaluate the effects of two such practices (no‐till [NT] and cover crops [CCs]) on soil hydraulic (e.g., saturated hydraulic conductivity [Ksat], and water retention) and physical (e.g., bulk density [BD], pore size distribution, air‐filled pore spaces [AFPSs], and water‐filled pore spaces [WFPSs]) properties. The CCs used included crimson clover (Trifolium incarnatum L.), hairy vetch (Vicia villosa Roth.), winter peas (Lathyrus hirsutus L.), oats (Avena sativa), winter wheat (Triticum aestivum L.), triticale (Triticale hexaploide Lart.), flax (Linum usitassimum L.), and barley (Hordeum vulgare L.). Soil samples were collected and analyzed during 2021 and 2022 right before CC termination at 0‐ to 10‐cm, 10‐ to 20‐cm, and 20‐ to 30‐cm depths. Results showed that, during 2021 and 2022, BD was 18% and 14% higher, respectively, under NC compared with CC management, while Ksat was 2.2 and 1.9 times higher, respectively, under CC compared with NC management. Further, the non‐capillary pores were significantly (p ≥ 0.05) higher under CC compared with NC management during both years of study. As a result, the majority of the total pores under CCs were filled with air, while the majority of total pores under NC management were filled with water. Therefore, this CC mix may be useful in lengthening the growing period during wet seasons by increasing air‐filled pore spaces.

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The Effect of Air Entry Values on Hysteresis of Water Retention Curve in Saline Soil

Cited by 24 publications

References 11 publications

An Index for Degree of Hysteresis in Water Retention

An Index for Degree of Hysteresis in Water Retention

Hysteresis of saturation-capillary pressure relations under consecutive drainage-imbibition cycles in fine sandy medium

No‐till cover crop effects on the hydro‐physical properties of a silt loam

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