The effect of hysteresis on three‐dimensional transient water flow during surface trickle irrigation

Elmaloglou, S.; Diamantopoulos, Efstathios

doi:10.1002/ird.353

Cited by 17 publications

(10 citation statements)

References 29 publications

(35 reference statements)

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“…In terms of the modelled cumulative volume of water through the bottom of the column (Figure 5), the volume predicted when using hysteretic SWCC was less than that predicted when using non-hysteretic SWCC, regardless of the upper surface boundary conditions. This result is consistent with the findings of Elmaloglou and Diamantopoulos (2008), who found that deep drainage under irrigation was reduced by soil moisture hysteretic effects. Analyses of model outputs indicate that lower drainage volumes occurred in hysteretic simulations because of: (1) higher evaporation rates in rainfall-evaporation simulations (HYDRUS evaporation is specified as a potential discharge, and actual evaporation is determined from a combination of potential evaporation and the soil moisture conditions), and (2) higher soil moisture contents and therefore higher total soil water storage (and hence less lower boundary discharge) in rainfall-redistribution simulations.…”

Section: Resultssupporting

confidence: 93%

Influence of soil moisture hysteresis on the functioning of capillary barriers

Zhang

Werner

Aviyanto

et al. 2009

Hydrological Processes

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Abstract:Previous experimental studies of capillary barriers have identified highly hysteretic soil moisture retention characteristics in the materials used. In this study, numerical modelling is used to analyse the role of soil moisture hysteresis in capillary barrier functioning. Comparisons between published experimental results and model simulations indicate that soil moisture hysteresis was a necessary inclusion in the modelling approach to adequately reproduce pore water pressure distributions and the timing of breakthrough occurrences. Under hypothetical intermittent infiltration and evaporation conditions, the predicted volumetric water content in the moisture retention layer was significantly different for hysteretic and non-hysteretic models. The hysteresis effect was found to be dependent on the nature of infiltration-evaporation cycling, although the predicted volume of flow through the hysteretic barrier was lower than that of the non-hysteretic case, regardless of the nature of the cyclic upper boundary conditions. For practical engineering designs, where the water leakage through the barrier is the primary concern, the inclusion of soil moisture hysteresis in numerical modelling is needed.

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Section: Resultssupporting

confidence: 93%

Influence of soil moisture hysteresis on the functioning of capillary barriers

Zhang

Werner

Aviyanto

et al. 2009

Hydrological Processes

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“…Both the water retention and hydraulic conductivity curves show hysteresis as a function of the pressure head. Moreover, hysteresis can significantly influence water flow in variably saturated porous media (Vachaud and Thony, 1971; Gillham et al, 1979; Elmaloglou and Diamantopoulos, 2008). The majority of the studies (and models) concerning hysteresis in the unsaturated zone deal with static experiments.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Nonequilibrium of Water Flow in Porous Media: A Review

Diamantopoulos

Durner

2012

Vadose Zone Journal

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This review provides an overview on various phenomena, hypothesized causes, and modeling approaches that describe "dynamic nonequilibrium" (DNE) of water fl ow in soils. Dynamic nonequilibrium is characterized from observa ons on the macroscale by an apparent fl ow-rate dependence of hydraulic proper es or by local nonequilibrium between water content and pressure head under monotonic imbibi on or drainage histories, i.e., not aff ected by tradi onal hysteresis. The literature indicates that key processes causing DNE are pore-scale phenomena such as relaxa on of air-water-interface distribu ons, limited air-phase permeability, dynamic contact angles, and me-dependent we ability changes. Furthermore, entrapment of water and pore water blockage, air-entry eff ects, and temperature eff ects might be involved. These processes act at diff erent pressure head regions and on diff erent me scales, which makes eff ec ve modeling of the combined phenomena challenging. On larger scales, heterogeneity of soil proper es can contribute to DNE observa ons. We conclude that there is an urgent need for precision measurements that are designed to quan fy dynamic eff ects.Abbrevia ons: DNAPL, dense nonaqueous-phase liquid; DNE, dynamic nonequilibrium; MSO, mulstep ou low; REV, representa ve elementary volume; SHP, soil hydraulic proper es; TDR, me domain refl ectometry.

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“…This model is used in the well‐known models, SWAP (Van Dam et al ., ), Hydrus 1D (Šimůnek et al ., ) and Hydrus 2D/3D (Šimůnek et al ., ). Elmaloglou and Diamantopoulos () explained in detail the incorporation of hysteresis in the mathematical model. It was assumed that a d = a w /2 where a w and a d are the a parameter in the relationship of van Genuchten () for the main wetting and drying curve, as proposed by Kool and Parker ().…”

Section: Methodsmentioning

confidence: 99%

The Effect of Drip Line Placement on Soil Water Dynamics in the Case of Surface and Subsurface Drip Irrigation

Diamantopoulos

Elmaloglou

2012

Irrigation and Drainage

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The effect of drip line placement on soil wetting pattern, deep percolation and evapotranspiration, in the case of surface and subsurface drip irrigation, was considered. To this aim, a mathematical model which describes water flow under surface and subsurface drip lines, taking into account root water uptake, evaporation of soil water from the soil surface and hysteresis in the soil water characteristic curve θ(Η), was used. Several numerical experiments were conducted, for three soils, two discharge rates and four drip line placements. The results showed that when the depth of placement increases, the horizontal movement of water, close to the surface, decreases. It was also concluded that in the case of surface drip irrigation, the values of the water content close to the drip line are lower compared with those of subsurface drip irrigation. Lastly, the numerical results showed that deep percolation increases at a higher pace than evaporation decreases, resulting in lower values of irrigation efficiency as the depth of placement increases. Copyright © 2012 John Wiley & Sons, Ltd.

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The effect of hysteresis on three‐dimensional transient water flow during surface trickle irrigation

Cited by 17 publications

References 29 publications

Influence of soil moisture hysteresis on the functioning of capillary barriers

Influence of soil moisture hysteresis on the functioning of capillary barriers

Dynamic Nonequilibrium of Water Flow in Porous Media: A Review

The Effect of Drip Line Placement on Soil Water Dynamics in the Case of Surface and Subsurface Drip Irrigation

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