A novel double disc method to determine soil hydraulic properties from drainage experiments with tension gradients

Moret‐Fernández, David; Latorre, Borja

doi:10.1016/j.jhydrol.2022.128625

Cited by 4 publications

(3 citation statements)

References 42 publications

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“…Based on the above, in our study, we presume that a hysteresis phenomenon is present in the soil profile due to changes in water availability in the soil profile (θ) due to multiple rainfall events; added to this, variations in soil texture (sandy clay loam and clay loam), generated a bottle effect due to the lack of uniformity in the shape and sizes of both individual pores and interconnected pore networks [73,74]. As a consequence, the parameter α, which is more related to soil structure, is more affected by the different wetting processes [75]; in addition, these conditions caused the residual water content (θr) to present variations in the soil profile due to higher suction (i.e., loam and clay loam soils with higher α values), as we observed in the depth of 20-40 cm [68,76], which causes almost all soil pores to remain filled with water at high tensions [72].…”

Section: Hydrological Properties Of the Soilmentioning

confidence: 82%

“…On the other hand, soil water retention is mainly related to changes in bulk density and its magnitude depends on soil texture [70,71]. Likewise, the soil water retention function is subject to the hysteresis phenomenon, which manifests itself as a difference between the soil wetting and drying equilibrium curves (hysteresis cycle) [72]. Based on the above, in our study, we presume that a hysteresis phenomenon is present in the soil profile due to changes in water availability in the soil profile (θ) due to multiple rainfall events; added to this, variations in soil texture (sandy clay loam and clay loam), generated a bottle effect due to the lack of uniformity in the shape and sizes of both individual pores and interconnected pore networks [73,74].…”

Section: Hydrological Properties Of the Soilmentioning

confidence: 99%

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Water Flow in the Soil Profile Under an Agroforestry System in the Colombian Amazon Based on HYDRUS-1D Model

Buriticá,

Suárez,

Ortiz-Morea

2023

Preprint

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Knowledge of water availability in terms of spatial (i.e., depth) and temporal variability of soil water is essential to describe soil water infiltration and storage processes accurately. Therefore, performing simulations of soil water dynamics can be a valuable tool to evaluate different land uses and their impact on water availability. Consequently, this study aimed to model the volumetric soil water content (θ, cm3 cm-3) under agroforestry systems (AFS) with cocoa. For this purpose, the θ was monitored at different depths (0-20, 20-40, 40-60, 60-80, 80-100 cm) in the soil profile of four plots (20 × 50 m) of cocoa under agroforestry systems. Environmental conditions significantly influenced the water balance of the cocoa crop. There were seven moments when evapotranspiration (ET0) was higher than 5 mm d-1. During those moments, the environment exhibited higher PAR values of 1041 µmol m-2 s-1, very low atmospheric relative humidity (RHa) levels (around 45%), higher ambient temperatures of 32.2 ºC and a vapor pressure deficit of 1.6 kPa whose θ levels reached 0.32 cm3 cm-3 and a water balance of -5.7 mm, which presented negative values during most of the study period. The θ obtained from the HYDRUS-1D model presented a slight bias as a high level of coherence between the observed values, based on the model's goodness-of-fit estimators. The above provides accurate simulations of soil water content at various depths, much-needed information for management schemes for cocoa cultivation under agroforestry systems.

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Section: Hydrological Properties Of the Soilmentioning

confidence: 82%

Section: Hydrological Properties Of the Soilmentioning

confidence: 99%

Water Flow in the Soil Profile Under an Agroforestry System in the Colombian Amazon Based on HYDRUS-1D Model

Buriticá,

Suárez,

Ortiz-Morea

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Scholars have traditionally relied on laboratory seepage test results to quantify the low-velocity non-Darcy seepage process of clay samples [12][13][14][15][16][17]. Currently, around ten characteristic curves have been established, with the power function curve being the most commonly used [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effects of Clay Content on Non-Linear Seepage Behaviors in the Sand–Clay Porous Media Based on Low-Field Nuclear Magnetic Resonance

Yin,

Cui,

Zhang

et al. 2024

Water

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Clay is widely encountered in nature and directly influences seepage behaviors, exerting a crucial impact on engineering applications. Under low hydraulic gradients, seepage behaviors have been observed to deviate from Darcy’s law, displaying a non-linear trend. However, the impacts of clay content on non-linear seepage behavior and its pore-scale mechanisms to date remain unclear. In this study, constant-head seepage experiments were conducted in sand–clay porous media under various hydraulic gradients. Low-field nuclear magnetic resonance (LF-NMR) technology was utilized to monitor the bound-water and free-water contents of sand–clay porous media under different seepage states. The results show a threshold hydraulic gradient (i0) below which there is no flow, and a critical hydraulic gradient (icr) below which the relationship between the hydraulic gradient (i) and seepage velocity (v) is non-linear. Both hydraulic gradients increased with clay content. Moreover, the transformation between bound water and free water was observed during the seepage-state evolution (no flow to pre-Darcy or pre-Darcy to Darcy). As the hydraulic gradient reached the i0, the pore water pressure gradually overcame the adsorption force of the bound-water film, reducing the thickness of the bound-water film, and causing non-linear seepage behavior. When i0 < i < icr, the enlarging hydraulic gradient triggers the thinning of bound water and enhances the fluidity of pore water. Moreover, the increasing clay content augments the bound-water content required for the seepage state’s change.

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A new experimental device for germinating seeds under controlled soil water potentials, a step beyond PEG

Moret-Fernández,

Tormo,

López

et al. 2024

Plant Soil

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Background and aims Germination as a function of soil water potential (h) is modelled using polyethylene glycol (PEG). But, PEG would not consider soil properties. Our objective is to show the limitations of PEG to model germination in real soils. Using a new device, the tension germinator (TG), we show the interaction between soil type, h and seed characteristics on seed germination. Methods TG (A Mariotte reservoir that supplies water at constant h to a porous substrate on which seeds are deposited). Barley (Hordeum vulgare L.) and vetch (Vicia sativa L.) seeds were placed on TG with loam (TG-loam) and sand (TG-sand), and h of 0, -0.002, -0.006 MPa. Then, the imbibition curves were monitored. PEG experiments (0 to -2.5 MPa) were performed to estimate the critical h, hPEG, or h from which the imbibition curve decreases compared with that at 0 MPa. PEG curves for 0 > h > -0.01 MPa were compared with TG. Results PEG and TG curves were not different at 0 MPa. hPEG for barley and vetch was within [0, -0.01] MPa. While no differences were observed between PEG at [0, -0.01] MPa and TG-loam curves, TG-sand curves at -0.002 and -0.006 MPa were different to those of PEG. Conversely to PEG at -0.01 MPa, no imbibition was observed in TG-sand (-0.006 MPa). A negligible influence of h in TG-loam was observed. Conclusions PEG is not adequate to describe seed germination in soil. But the TG allows monitoring seed germination in real soils and controlled h.

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A novel double disc method to determine soil hydraulic properties from drainage experiments with tension gradients

Cited by 4 publications

References 42 publications

Water Flow in the Soil Profile Under an Agroforestry System in the Colombian Amazon Based on HYDRUS-1D Model

Water Flow in the Soil Profile Under an Agroforestry System in the Colombian Amazon Based on HYDRUS-1D Model

Effects of Clay Content on Non-Linear Seepage Behaviors in the Sand–Clay Porous Media Based on Low-Field Nuclear Magnetic Resonance

A new experimental device for germinating seeds under controlled soil water potentials, a step beyond PEG

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