Estimation of Unsaturated Hydraulic Conductivity of Granular Soils from Particle Size Parameters

Wang, Jipeng; Zhuang, Pei‐Zhi; Luan, Ji-Yuan; Liu, Tai-Heng; Tan, Yiran; Zhang, Jiong

doi:10.3390/w11091826

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…As the soil void ratio increases, the permeability increases due to the expansion of the flow channel. Additionally, the relationship between soil permeability and void ratio shows nonlinear characteristics, which is consistent with previous studies [25,[36][37][38][39]. Based on the assumption made by the Kozeny-Carman model [22,25], the seepage paths through the soil can be simplified as many tortuous Poiseuille capillaries with a specific cross-sectional shape.…”

Section: Effect Of the Void Ratio On The Transparent Soil Permeabilitysupporting

confidence: 87%

Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil

Huang

Guo

Tang

et al. 2019

Water

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An accurate estimation of soil permeability is essential in geotechnical engineering. Transparent soil provides a promising experimental material to visualize pore-scale fluid flow, although the permeability characteristic of transparent soil remains unclear. As a result of the replacement of the fluid and solid phase, the permeability coefficient of transparent soil is usually several times or even more than ten times smaller than that of natural soil with the same particle size distribution and porosity. Fused quartz sand is used as the solid phase in this proposed transparent soil, which exhibits a similar mechanical behavior but different permeability to those of natural sand. Due to its low cost and eco-friendly characteristic, a mixture of mineral oil and aliphatic hydrocarbon is proposed as the liquid phase, which can achieve the same refractive index as the fused quartz sand after calculating the material proportion. Through a series of laboratory tests, the permeability of the transparent soil is obtained; the permeability is affected by the fluid dynamic viscosity, fluid density, particle size, particle size distribution, void ratio, and pore morphology. A hierarchical approach is introduced to quantitatively evaluate the effect of the particle shape on the permeability. Based on the experimental results, a modified Kozeny–Carman model is proposed for the prediction of transparent soil permeability, which can guide the preparation of transparent soil samples in further experimental studies.

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Section: Effect Of the Void Ratio On The Transparent Soil Permeabilitysupporting

confidence: 87%

Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil

Huang

Guo

Tang

et al. 2019

Water

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“…The high cost and effort of in situ measurements and the growing demand for such data have led scientists to seek alternative indirect methods [18,19]. In recent years, pedotransfer functions (PTFs) have become popular and have been used to estimate time-consuming and difficult-to-measure soil properties, such as Ks or soil water retention (pF) values [1,[20][21][22]. Ahuja et al [23], Rawls et al [24], Timlin et al [25], and Suleiman and Ritchie [26] proposed formulas for estimating Ks values based on the effective porosity.…”

Section: Introductionmentioning

confidence: 99%

Use of Pedotransfer Functions in the Rosetta Model to Determine Saturated Hydraulic Conductivity (Ks) of Arable Soils: A Case Study

Borek

Bogdał

Kowalik

2021

Land

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A key parameter for the design of soil drainage and irrigation facilities and for the modelling of surface runoff and erosion phenomena in land-formed areas is the saturated hydraulic conductivity (Ks). There are many methods for determining its value. In situ and laboratory measurements are commonly regarded as the most accurate and direct methods; however, they are costly and time-consuming. Alternatives can be found in the increasingly popular models of pedotransfer functions (PTFs), which can be used for rapid determination of soil hydrophysical parameters. This study presents an analysis of the Ks values obtained from in situ measurements conducted using a double-ring infiltrometer (DRI). The measurements were conducted using a laboratory permeability meter (LPM) and were estimated using five PTFs in the Rosetta program, based on easily accessible input data, i.e., the soil type, content of various grain sizes in %, density, and water content at 2.5 and 4.2 pF, respectively. The degrees of matching between the results from the PTF models and the values obtained from the in situ and laboratory measurements were investigated based on the root-mean-square deviation (RMSD), Nash–Sutcliffe efficiency (NSE), and determination coefficient (R2). The statistical relationships between the tested variables tested were confirmed using Spearman’s rank correlation coefficient (rho). Data analysis showed that in situ measurements of Ks were only significantly correlated with the laboratory tests conducted on intact samples; the values obtained in situ were much higher. The high sensitivity of Ks to biotic and abiotic factors, especially in the upper soil horizons, did not allow for a satisfactory match between the values from the in situ measurements and those obtained from the PTFs. In contrast, the laboratory measurements, showed a significant correlation with the Ks values, as estimated by the models PTF-2 to PTF-5; the best match was found for PTF-2.

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“…Saturated hydraulic conductivity of crushed silica and Fujian sand were measured according to BS 1377‐5:1990, as 6.16 × 10 −4 m s −1 and 3.0 × 10 −7 m s −1 respectively. Based on the saturated hydraulic conductivity and estimated SWRC, the unsaturated hydraulic conductivity functions of Fujian sand, crushed silica, and water‐repellent Fujian sand are determined by using van Genuchten–Mualem model (Wang et al., 2019), as summarized in Figure 5.…”

Section: Methodsmentioning

confidence: 99%

Cover systems with synthetic water‐repellent soils

Zheng

Xing

Lourenço

et al. 2021

Vadose Zone Journal

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A cover system is a crucial component of engineered landfills, to minimize water percolation into the underlying waste. Capillary barriers are an alternative cover system, which has been widely used in the arid and semiarid regions as no cohesive, low-permeability materials are used. However, the performance of capillary barriers in tropical climate has been unsatisfactory (breakthrough observed). In recent years, synthetic water-repellent granular materials have drawn increasing attention due to their distinctive hydraulic behavior (inhibited water infiltration and high water entry pressure), suggesting they may also be used to improve the performance of cover systems. In this study, flume tests were conducted with inclined model slopes under artificial rainfall. By monitoring the surface runoff, lateral diversion, and basal percolation and conducting water balance analysis, the performance of monolithic cover, conventional capillary barrier, and water-repellent cover systems were evaluated. The study revealed that (a) the barrier effect and diversion capacity were significantly strengthened by induced water repellency, providing a promising solution to extend the application of capillary barrier covers; and (b) cover systems can be formed using one raw material to decrease the construction cost, by using synthetic water-repellent soil as the underlying layer.

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Estimation of Unsaturated Hydraulic Conductivity of Granular Soils from Particle Size Parameters

Cited by 14 publications

References 22 publications

Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil

Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil

Use of Pedotransfer Functions in the Rosetta Model to Determine Saturated Hydraulic Conductivity (Ks) of Arable Soils: A Case Study

Cover systems with synthetic water‐repellent soils

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