One-dimensional experimental study of rainfall infiltration into unsaturated soil

Montoya-Domínguez, Juan David; Aristizábal, Edwin Fabián García; Vega-Posada, Carlos A.

doi:10.17533/udea.redin.n82a10

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…In this study, the soil column experiment was performed using a transparent cuboid model device. An interesting finding is that the wetting fronts migrated in a straight line in the cube model box containing loess at constant head height, which is consistent with the results using cylindrical model box under the same conditions [44,45]. This shows that the shape of the model box had no effect on the migration characteristics of wetting fronts.…”

Section: Discussionsupporting

confidence: 86%

Experimental Investigation of Water Infiltration Law in Loess with Black Locust (Robinia pseudoacacia) Roots

Gu,

Zhang

et al. 2024

Agronomy

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Physical model experiments are increasingly applied in the study of the water infiltration law in loess with roots. In the past, due to differences in study objects and the limitations of measuring techniques, the infiltration law in loess with roots is rarely evaluated by using appropriate indoor physical model experimental data. In order to investigate the law of water infiltration in loess with roots, we designed a new soil column experimental device that can automatically collect data and images. By comparing the soil column experiment data of loess, we analyzed variables in root contents (the ratio of root mass to dry soil mass) and root types. Roots with diameters of 0–2 mm, 2–5 mm, and 5–10 mm are defined as type I, type II, and type III, respectively. It was found that the water infiltration rate, water-holding capacity, and saturated permeability coefficient increase with the increase in root content. In loess containing different root types, the root types were found to improve the rate of water infiltration, water-holding capacity, and saturated permeability coefficient in the soil. The root types were ranked in descending order in terms of their impact: root type II had the highest improvement, followed by root type III, and then root type I. The phenomenon of circumferential flow existed when water infiltrated loess with roots. Root content and root type would affect the radius of circumferential flow, infiltration path, and cross-section. When calculating the saturated permeability coefficient of loess with roots, ignoring the effect of circumferential flow would lead to a higher result.

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Section: Discussionsupporting

confidence: 86%

Experimental Investigation of Water Infiltration Law in Loess with Black Locust (Robinia pseudoacacia) Roots

Gu,

Zhang

et al. 2024

Agronomy

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“…Several studies have presented the development, calibration, and use of RSs for a wide range of purposes, such as agricultural research [17][18][19][20][21][22]; biomass studies [23,24]; infil-Sustainability 2021, 13, 3060. https://doi.org/10.3390/su13063060 https://www.mdpi.com/journal/sustainability Sustainability 2021, 13, 3060 2 of 22 tration analysis [14,15,25,26]; urban hydrology simulation, including permeable pavement performance [27], evaluation of processes of accumulation and transport of pollutants on pavements and roof surfaces [28][29][30][31][32]; and rainwater quality research. RSs are frequently used in geotechnical evaluations of soil loss and erosion [1,16,22,[33][34][35][36][37][38], slope stability [13,39,40] and infiltration, and percolation in unsaturated soils [12,14,15,41,42]. The performance of RSs must be evaluated considering various initial conditions, boundary conditions, simulated rainfall characteristics, and the scale factor (i.e., the evaluation of the specimen geometry and dimensions).…”

Section: Introductionmentioning

confidence: 99%

Development of a Rainfall and Runoff Simulator for Performing Hydrological and Geotechnical Tests

et al. 2021

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Laboratory apparatuses for the analysis of infiltration and runoff enable studies under controlled environments and at reduced costs. Unfortunately, the design and construction of such systems are complex and face difficulties associated with the scale factor. This paper presents the design, construction, and evaluation of a portable rainfall and runoff simulator. The apparatus allows the evaluation of unsaturated soils with and without vegetation cover, under a wide range of simulation scenarios. The apparatus also enables the control of the intensity, size, and uniformity of simulated raindrops for variable surface slope, specimen thickness, and length conditions. The monitoring of the volumetric water content and matric suction and a rigorous computation of water balance are ensured. The obtained results indicate that the automated rainfall generator produces raindrops with Christiansen uniformity coefficients higher than 70%, and with an adequate distribution of raindrop sizes under a range of rainfall intensities between 86.0 and 220.0 mm h−1. The ideal rainfall generator conditions were established for a relatively small area equal to or lower than 1.0 m2 and considering rainfall events with return periods of 10 to 100 years.

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“…Several authors have designed and evaluated different types of RA's for different fields of study: for agricultural research (Montebeller et al, 2001;Alves Sobrinho et al, 2008); for infiltration studies (Shao & Baumgartl, 2014;Rahardjo et al, 2016); for urban hydrology, in particular related to permeable pavements (Araújo et al, 2000;Silva, 2006;Castro, 2011); and for the study of quality of runoff water from pavements and roofs (Egodawatta, 2007;Egodawatta et al, 2007Egodawatta et al, , 2009Minguntanna, 2009), all using the RA developed by Herngren (2005). RA's are also used to evaluate soil erosion (Poesen et al, 1994;Römkens et al, 2002;Das Kunststoff-Zentrum, 2011;Zhang et al, 2014;Sadeghi et al, 2015;Wang and Lai, 2018;Liu et al, 2019), landslides and slope stability (Egeli & Pulat, 2011;Cecconi et al, 2015;Montrasio et al, 2016); and infiltration in unsaturated soils considering subsurface flow (Miyazaki, 2005;Montoya-Dominguez et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of laboratory apparatuses for the study of infiltration and runoff

Mendes

Gitirana

Rebolledo

et al. 2020

RBRH

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Runoff apparatuses (RA) are developed to study infiltration, runoff generation, and erosion processes. Several RA designs are available, but limited attention has been given to the effects of the equipment scale, initial, and boundary conditions on measured runoff. This paper presents a model-based evaluation of RAs using a finite element solution for Richard’s equation and a novel ground surface boundary condition designed to accommodate unsaturated soil behavior. The hydraulic properties of two tropical soils were considered, with multiple combinations of initial water contents, specimen dimensions, and sloping angle. The numerical exercises indicate that soils with lower air-entry values require an equilibrium stage for the establishment of initial conditions. Testing protocols with equilibrium times of 48 hours are recommended. Moisture flow produced by gravity when sloping the specimen was shown to potentially affect surface conditions and, consequently, runoff. Testing specifications to minimize the effects of specimen sloping are presented. The runoff mechanism in an RA was shown to have up to three stages, all with clear physical meaning. The third stage is an undesirable consequence of the influence of the RA’s impervious bottom. The establishment of the minimum specimen thickness that prevents boundary effects was shown to have major importance to testing results.

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One-dimensional experimental study of rainfall infiltration into unsaturated soil

Cited by 3 publications

References 20 publications

Experimental Investigation of Water Infiltration Law in Loess with Black Locust (Robinia pseudoacacia) Roots

Experimental Investigation of Water Infiltration Law in Loess with Black Locust (Robinia pseudoacacia) Roots

Development of a Rainfall and Runoff Simulator for Performing Hydrological and Geotechnical Tests

Numerical evaluation of laboratory apparatuses for the study of infiltration and runoff

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