Avaliação da condutividade hidráulica em área de recarga do aqüífero Botucatu

Zuquette, Lázaro Valentin; Palma, Janaina Barrios

doi:10.1590/s0370-44672006000100011

Cited by 6 publications

(8 citation statements)

References 2 publications

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“…The soil has a low CEC (maximum value 4.20 cmolc Kg -1 ) and it suggests a low capacity to adsorb cations by electrostatic adsorption (Fagundes & Zuquette, 2011). Mean soil properties presented values in accordance with the typical characteristics of the studied soil (Giacheti et al, 1993;Zuquette & Palma, 2006), and are shown in Table1.…”

Section: Soil Properties Statistical Analysissupporting

confidence: 67%

Spatial variability of hydraulic conductivity and solute transport parameters and their spatial correlations to soil properties

2019

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Section: Soil Properties Statistical Analysissupporting

confidence: 67%

Spatial variability of hydraulic conductivity and solute transport parameters and their spatial correlations to soil properties

2019

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“…We also obtained a low CEC of 4.20 cmolc Kg -1 , indicative of a soil with low capacity to adsorb cations by electrostatic adsorption (Fagundes & Zuquette, 2011). Finally, the mean values of the soil physical properties were in accordance with typical values found earlier in this type of soil Zuquette & Palma, 2006 Fig. 3.11 is a zoom in Fig.…”

Section: Double-ring Infiltrometer (Dri)supporting

confidence: 88%

Section: Average Soil Propertiessupporting

confidence: 66%

Upscaling of water flow and mass transport in a tropical soil: numerical, laboratory and field studies

Godoy¹

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Numerical models are becoming fundamental tools to predict a range of complex problems faced by geotechnical and geo-environmental engineers. However, to render the model reliable for future predictions, the model input parameters must be determined with consideration of the scale effects. If there is a difference of scales between the observation and the model scales there are two possible ways to consider it: or models are constructed with elements of a size similar to that at which the data were measured, or some upscaling rules must be defined. In this context, this thesis focuses on upscaling of water flow and mass transport in a tropical soil by means of numerical, laboratory and field studies. This thesis is organized in four parts.First, the heterogeneity, correlation and cross-correlation between solute transport parameters (dispersivity, α, and partition coefficient, Kd) and soil properties are studied in detail. In this part, it is verified that the hydraulic conductivity (K) and solute transport parameters are highly heterogeneous, while soil properties are not. Spatial correlation of α, K, and statistically significant variables are studied, and it would probably improve the estimation only in a small-scale study, since the spatial correlation are only observed up to 2.5 m. This study is a first attempt to evaluate the spatial variation in the correlation coefficient of transport parameters of a reactive and a nonreactive solute, indicating the more relevant variables and the one that should be included in future studies.In the second part, scale effect on K, dispersivity and partition coefficient of potassium and chloride are studied experimentally by means of laboratory and field experiments. The purpose is to contribute to the discussion about scale effects on K, α and Kd and understanding how these parameters behave with the change in the scale of measurement. Results show that K values increases with scale, regardless of the method of measurement, except for the results obtained from double-ring infiltrometer tests. Dispersivity trends to increase exponentially with the sample height.Partition coefficient tends to increase with sample length, diameter and volume. These differences in the parameters according to the scale of measurement must be considered when these observations are later used as input to numerical models, otherwise the responses can be misrepresented.x Third, stochastic analysis of three-dimensional hydraulic conductivity upscaling is performed using a simple average and the Laplacian-with-skin methods for a variety of block sizes based on real K measurements. In this part it is demonstrated the errors that can be introduced by using a deterministic upscaling using simple averages of the measured K without accounting for the spatial correlation. Results show that K heterogeneity can be incorporated in the daily practice of the geotechnical modeler.The aspects to consider when performing the upscaling are also discussed. Finally, the dependence of the exponent of the p-n...

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Section: Average Soil Propertiessupporting

confidence: 65%

Upscaling of water flow and mass transport in a tropical soil: numerical, laboratory and field studies

Godoy¹

View full text Add to dashboard Cite

Numerical models are becoming fundamental tools to predict a range of complex problems faced by geotechnical and geo-environmental engineers. However, to render the model reliable for future predictions, the model input parameters must be determined with consideration of the scale effects. If there is a difference of scales between the observation and the model scales there are two possible ways to consider it: or models are constructed with elements of a size similar to that at which the data were measured, or some upscaling rules must be defined. In this context, this thesis focuses on upscaling of water flow and mass transport in a tropical soil by means of numerical, laboratory and field studies. This thesis is organized in four parts.First, the heterogeneity, correlation and cross-correlation between solute transport parameters (dispersivity, α, and partition coefficient, Kd) and soil properties are studied in detail. In this part, it is verified that the hydraulic conductivity (K) and solute transport parameters are highly heterogeneous, while soil properties are not. Spatial correlation of α, K, and statistically significant variables are studied, and it would probably improve the estimation only in a small-scale study, since the spatial correlation are only observed up to 2.5 m. This study is a first attempt to evaluate the spatial variation in the correlation coefficient of transport parameters of a reactive and a nonreactive solute, indicating the more relevant variables and the one that should be included in future studies.In the second part, scale effect on K, dispersivity and partition coefficient of potassium and chloride are studied experimentally by means of laboratory and field experiments. The purpose is to contribute to the discussion about scale effects on K, α and Kd and understanding how these parameters behave with the change in the scale of measurement. Results show that K values increases with scale, regardless of the method of measurement, except for the results obtained from double-ring x infiltrometer tests. Dispersivity trends to increase exponentially with the sample height.Partition coefficient tends to increase with sample length, diameter and volume. These differences in the parameters according to the scale of measurement must be considered when these observations are later used as input to numerical models, otherwise the responses can be misrepresented.Third, stochastic analysis of three-dimensional hydraulic conductivity upscaling is performed using a simple average and the Laplacian-with-skin methods for a variety of block sizes based on real K measurements. In this part it is demonstrated the errors that can be introduced by using a deterministic upscaling using simple averages of the measured K without accounting for the spatial correlation. Results show that K heterogeneity can be incorporated in the daily practice of the geotechnical modeler.The aspects to consider when performing the upscaling are also discussed. Finally, the dependence of the exponent of the p-norm as a...

show abstract

Avaliação da condutividade hidráulica em área de recarga do aqüífero Botucatu

Cited by 6 publications

References 2 publications

Spatial variability of hydraulic conductivity and solute transport parameters and their spatial correlations to soil properties

Spatial variability of hydraulic conductivity and solute transport parameters and their spatial correlations to soil properties

Upscaling of water flow and mass transport in a tropical soil: numerical, laboratory and field studies

Upscaling of water flow and mass transport in a tropical soil: numerical, laboratory and field studies

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