Effects of the Grain Size on Dynamic Capillary Pressure and the Modified Green–Ampt Model for Infiltration

Tsai, Ying-Chien; Liu, Yu Tung; Wang, Yung‐Li; Chang, Liang-Cheng

doi:10.1155/2018/8946948

Cited by 9 publications

(3 citation statements)

References 43 publications

(59 reference statements)

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“…The relatively low density of large clasts or boulders as well as the prevalence of angular granitic granules and pebbles suggest that the soils of the Fryxell basin are young and poorly developed compared to other surfaces throughout the MDVs [35]. The coarse nature of most Taylor Valley soils produces well-drained soils with large pore spaces, creating a compromise between high permeability (which promotes water migration) and low capillarity (which prevents the wicking of water due to surface tension and is controlled by the sample's matric potential) [39,40].…”

Section: Soil Moisture In the Mcmurdo Dry Valleysmentioning

confidence: 99%

The Distribution of Surface Soil Moisture over Space and Time in Eastern Taylor Valley, Antarctica

Salvatore,

Barrett,

Fackrell

et al. 2023

Remote Sensing

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Available soil moisture is thought to be the limiting factor for most ecosystem processes in the cold polar desert of the McMurdo Dry Valleys (MDVs) of Antarctica. Previous studies have shown that microfauna throughout the MDVs are capable of biological activity when sufficient soil moisture is available (~2–10% gravimetric water content), but few studies have attempted to quantify the distribution, abundance, and frequency of soil moisture on scales beyond that of traditional field work or local field investigations. In this study, we present our work to quantify the soil moisture content of soils throughout the Fryxell basin using multispectral satellite remote sensing techniques. Our efforts demonstrate that ecologically relevant abundances of liquid water are common across the landscape throughout the austral summer. On average, the Fryxell basin of Taylor Valley is modeled as containing 1.5 ± 0.5% gravimetric water content (GWC) across its non-fluvial landscape with ~23% of the landscape experiencing an average GWC > 2% throughout the study period, which is the observed limit of soil nematode activity. These results indicate that liquid water in the soils of the MDVs may be more abundant than previously thought, and that the distribution and availability of liquid water is dependent on both soil properties and the distribution of water sources. These results can also help to identify ecological hotspots in the harsh polar Antarctic environment and serve as a baseline for detecting future changes in the soil hydrological regime.

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Section: Soil Moisture In the Mcmurdo Dry Valleysmentioning

confidence: 99%

The Distribution of Surface Soil Moisture over Space and Time in Eastern Taylor Valley, Antarctica

Salvatore,

Barrett,

Fackrell

et al. 2023

Remote Sensing

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show abstract

“…Gavin et al [25] improved the Green-Ampt model by assuming that the matric suction of soil increases linearly with depth after rainfall. Tsai et al [26] established an MAGM infiltration model considering the dynamic effect of capillary pressure based on the traditional Green-Ampt model. Zeng et al [27] investigated the macro-mesoscopic characteristics of seepage flow in porous media.…”

Section: Fig 1 -Sketch Of Central Route Of the Snwtp [1]mentioning

confidence: 99%

Study on the Influence of Sudden Change of Water Level on High Fill Canal Segment

Yuan

Xu²,

Nie³

et al. 2021

CEJ

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Extreme conditions will cause the water level of high fill canal segment to change suddenly, which will affect the velocity and pore pressure of the slope. In this paper, numerical method is used to study the influence of water level sudden change on seepage characteristics of high fill canal segment. HyperMesh software is used to establish the finite element model of typical high fill canal segment under complex foundation conditions. Through the combination of secondary development program and fluid-structure coupling calculation method, the fluid structure cou-pling effect of canal under sudden change of water level is analyzed in ABAQUS. The results show that when the water level changes suddenly, the pore pressure below the free water surface and the velocity near the free surface will be greatly affected.

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“…The simulation of the new equation reaches reasonable agreement with coarse grained molecular dynamics results. Meanwhile, the actions of porous media materials and capillary water are also reflected by modified models, as indicated by the vast majority of laboratory test results (Hsu et al 2017;Tsai et al 2018). Usevičiūtė and Baltrėnaitė-Gedienė (2021) presented a modified Lucas-Washburn equation considering the effect of volumetric swelling, energy loss coefficient, and radius of swelled capillary.…”

Section: Introductionmentioning

confidence: 99%

Investigation of capillary water migration in the sandstone block based on electrical resistivity measurements

Yang

Chen

Zhao³

et al. 2022

Preprint

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Capillary water migration observed in sandstone block seriously affects pore structure and mechanical properties under the influence of the natural environment. In addition to continuous capillary action, the salt solution will be crystallized in the pores under the dry-wet cycles, and thereby deterioration occurs on the surface. To investigate the spatial and temporal evolution of material structure, a series of capillary water absorption tests were carried out on sandstone samples. Furthermore, stereo microscope and high-density resistivity instrument were conducted to monitor the characteristics of the surface and internal pores at intervals. Meanwhile, a novel Terzaghi model was proposed for modeling the variation trend of capillary water rise over time, in which the variation in porosity were characterized by saturated degree. The electrical resistivity measurements in millimeter-scale show that the rising trend of the dry-wet interface resembles the saddle shape. Moreover, the soluble salt is more enriched near the dry-wet interface under the capillary action due to the slow rise of the salt solution when it reaches the dry-wet interface. With the increase of dry-wet cycles, an obvious salt layer appeared on the surface accompanied by sandstone block crisp and pulverized phenomena, and significantly increased the capillary water absorption rate and porosity. In detail, the maximum mass loss due to mineral detachment of the surface reaches 2% in a single dry-wet cycle. Additionally, the study provides some references for evaluating the capillary action and deterioration mechanism of similar porous media materials by using a rapid and nondestructive method.

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Effects of the Grain Size on Dynamic Capillary Pressure and the Modified Green–Ampt Model for Infiltration

Cited by 9 publications

References 43 publications

The Distribution of Surface Soil Moisture over Space and Time in Eastern Taylor Valley, Antarctica

The Distribution of Surface Soil Moisture over Space and Time in Eastern Taylor Valley, Antarctica

Study on the Influence of Sudden Change of Water Level on High Fill Canal Segment

Investigation of capillary water migration in the sandstone block based on electrical resistivity measurements

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