Areal Infiltration Modeling over Soils with Spatially Correlated Hydraulic Conductivities

Govindaraju, Rao S.; Morbidelli, Renato; Corradini, Corrado

doi:10.1061/(asce)1084-0699(2001)6:2(150)

Cited by 67 publications

(62 citation statements)

References 19 publications

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“…The dimensionless equations for effective saturated hydraulic conductivity were derived from a sharp front model. Comparisons with 1-D Monte Carlo-based simulations, 3-D numerical simulations, and analytical results proposed by Govindaraju et al [4] and Ojha and Govindaraju [31] showed that the proposed theory provides a simple alternative to determining the surface soil moisture and infiltration rates in the field for a single rainfall event, with insights into role of rainfall-and soil-controlled behavior for pre-and post-ponded conditions. The theoretical model readily describes field-scale surface soil moisture and infiltration rates where otherwise extensive amount of numerical computations would be needed.…”

Section: Discussionmentioning

confidence: 82%

“…The ability of the analytical expressions of y e f f (Equations (8) and (11)) proposed in this study for predicting field-scale infiltration rates and surface soil moisture contents were tested with the help of numerical simulations and analytical expressions for field-scale surface soil moisture evolution [31] and infiltration rates [4].…”

Section: Resultsmentioning

confidence: 99%

“…Similar to surface soil moisture, the mean field-scale infiltration rates generated using y e f f are compared with mean field-scale infiltration rates obtained from the analytical expression (Equation (A8) in the Appendix A) proposed by Govindaraju et al [4]. The curve for mean field-scale infiltration rates, generated using y e f f in the analytical expression for local-scale infiltration rate variation derived from sharp-front approximation (Equation (3)), is denoted as "A-Local".…”

Section: Comparisons With Analytical Resultsmentioning

confidence: 99%

“…When developing an expression for effective saturated hydraulic conductivity K s (or y), we are governed by preserving the correct limiting properties so that the infiltration rates obtained from effective properties using the deterministic Green-Ampt model replicate field-scale infiltration rates at small and large times. By utilizing the theories developed in earlier studies of Govindaraju et al [4] the following expression for effective value of y e f f is proposed to incorporate spatial variability of soil hydraulic properties for predicting infiltrations rates at the field-scale. Because the Green-Ampt equation is an approximate form of the Richards equation, the effective value of y in Equation (8), while suitable for field-scale infiltration rates, does not replicate field-scale surface soil moisture well, and a different tack has to be employed.…”

Section: Field-scale Solutionmentioning

confidence: 99%

“…The description of infiltration rates and surface soil moisture at different spatial and temporal scales is complicated further by the spatial heterogeneity exhibited by the hydraulic properties of the field-soils [4][5][6]. To estimate the spatial and temporal variation of surface soil moisture content and infiltration rates, ground-based measurements are most commonly used.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effective Saturated Hydraulic Conductivity for Representing Field-Scale Infiltration and Surface Soil Moisture in Heterogeneous Unsaturated Soils Subjected to Rainfall Events

Ojha

Corradini

Morbidelli

et al. 2017

Water

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Spatial heterogeneity in soil properties has been a challenge for providing field-scale estimates of infiltration rates and surface soil moisture content over natural fields. In this study, we develop analytical expressions for effective saturated hydraulic conductivity for use with the Green-Ampt model to describe field-scale infiltration rates and evolution of surface soil moisture over unsaturated fields subjected to a rainfall event. The heterogeneity in soil properties is described by a log-normal distribution for surface saturated hydraulic conductivity. Comparisons between field-scale numerical and analytical simulation results for water movement in heterogeneous unsaturated soils show that the proposed expressions reproduce the evolution of surface soil moisture and infiltration rate with time. The analytical expressions hold promise for describing mean field infiltration rates and surface soil moisture evolution at field-scale over sandy loam and loamy sand soils.

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Section: Discussionmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Comparisons With Analytical Resultsmentioning

confidence: 99%

Section: Field-scale Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effective Saturated Hydraulic Conductivity for Representing Field-Scale Infiltration and Surface Soil Moisture in Heterogeneous Unsaturated Soils Subjected to Rainfall Events

Ojha

Corradini

Morbidelli

et al. 2017

Water

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Local‐ and field‐scale stochastic‐advective vertical solute transport in horizontally heterogeneous unsaturated soils

Ojha

Prakash

Govindaraju

2014

Water Resources Research

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Description of field-scale solute transport in unsaturated soils is essential for assessing the degree of contamination, estimating fluxes past a control plane and for designing remedial measures. The flow field is usually described by numerical solution of the Richards equation followed by numerical solution of the advection-dispersion equation to describe contaminant movement. These numerical solutions are highly complex, and do not provide the insights that are possible from simpler analytical representations. In this study, analytical solutions at the local scale are developed to describe purely advective vertical transport of a conservative solute along the principle characteristic of the flow field. Local-scale model development is simplified by using a sharp-front approximation for water movement. These local solutions are then upscaled to field-scale solute transport by adopting a lognormally distributed horizontal hydraulic conductivity field to represent the natural heterogeneity observed in field soils. Analytical expressions are developed for the mean behavior of solute transport at the field scale. Comparisons with experimental observations find that trends of field-scale solute behavior are reasonably reproduced by the model. The accuracy of the proposed solution improves with increasing spatial variability in the hydraulic conductivity as revealed by further comparisons with numerical results of the Richards equation-based field-scale solute movement. In some cases, the sharp-front approximation may lead to anomalous field-scale behavior depending on the role of pre and postponded conditions in the field, and this limitation is discussed. The proposed method shows promise for describing field-scale solute movement in loamy sand and sandy loam soils.

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In situ measurements of soil saturated hydraulic conductivity: Assessment of reliability through rainfall-runoff experiments

Morbidelli

Saltalippi

Flammini

et al. 2017

Hydrological Processes

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The saturated hydraulic conductivity, K s , is a soil property that has a key role in the partitioning of rainfall into surface runoff and infiltration. The commonly used instruments and methods for in situ measurements of K s have frequently provided conflicting results. Comparison of K s estimates obtained by three classical devices-namely, the double ring infiltrometer (DRI), the Guelph version of the constant-head well permeameter (GUELPH-CHP) and the CSIRO version of the tension permeameter (CSIRO-TP) is presented. A distinguishing feature in this study is the use of steady deep flow rates, obtained from controlled rainfall-runoff experiments, as benchmark values of K s at local and field-plot scales, thereby enabling an assessment of these methods in reliably reproducing repeatable values and in their capability of determining plot-scale variation of K s . We find that the DRI grossly overestimates K s , the GUELPH-CHP gives conflicting estimates of K s with substantial overestimation in laboratory experiments and underestimation at the plot scale, whereas the CSIRO-TP yields average K s values with significant errors of 24% in the plot scale experiment and 66% in laboratory experiments. Although the DRI would likely yield a better estimate of the nature of variability than the GUELPH-CHP and CSIRO-TP, a separate calibration may be warranted to correct for the overestimation of K s values. The reasons for such discrepancies within and between the measurement methods are not yet fully understood and serve as motivation for future work to better characterize the uncertainty associated with individual measurements of K s using these methods and the characterization of field scale variability from multiple local measurements.

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Areal Infiltration Modeling over Soils with Spatially Correlated Hydraulic Conductivities

Cited by 67 publications

References 19 publications

Effective Saturated Hydraulic Conductivity for Representing Field-Scale Infiltration and Surface Soil Moisture in Heterogeneous Unsaturated Soils Subjected to Rainfall Events

Effective Saturated Hydraulic Conductivity for Representing Field-Scale Infiltration and Surface Soil Moisture in Heterogeneous Unsaturated Soils Subjected to Rainfall Events

Local‐ and field‐scale stochastic‐advective vertical solute transport in horizontally heterogeneous unsaturated soils

In situ measurements of soil saturated hydraulic conductivity: Assessment of reliability through rainfall-runoff experiments

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