About
35
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Introduction
Experience in environmental geotechnics, flow dynamic on unsaturated and saturated soils and direct and inverse simulation of subsurface flow and solute transport. Practice in soil characterization (chemical, physical and physico-chemical), laboratory proficiency and familiarity with soils testing equipment (related to saturated and unsaturated flow and solute transport). Experience with environmental fieldwork, field testing, and sampling of soil and groundwater.
Additional affiliations
March 2019 - present
September 2015 - March 2018
January 2014 - March 2018
Education
June 2015 - March 2018
March 2014 - March 2018
August 2011 - September 2013
Publications
Publications (35)
The ensemble random forest filter (ERFF) is presented as an alternative to the ensemble Kalman filter (EnKF) for inverse modeling. The EnKF is a data assimilation approach that forecasts and updates parameter estimates sequentially in time as observations are collected. The updating step is based on the experimental covariances computed from an ens...
The ensemble random forest filter (ERFF) is presented as an alternative to the ensemble Kalman filter (EnKF) for the purpose of inverse modeling. The EnKF is a data assimilation approach that forecasts and updates parameter estimates sequentially in time as observations are being collected. The updating step is based on the experimental covariances...
The ensemble smoother with multiple data assimilation (ES-MDA) coupled to a normal-score transformation is used to fit a Langmuir isotherm curve to estimate its parameters (\(S_{m}\) and b) and their uncertainty. The highlights of this work are threefold: (1) the ES-MDA can be used as a curve fitting procedure, (2) the ES-MDA provides also a full u...
The study of the spatial and temporal variations of groundwater level (GL) is essential for allocation of groundwater resources and management of contaminant sites. Commonly, GL data is obtained in the field only in limited positions, at monitoring wells. Interpolation methods, herein referred to as deterministic geostatistics, are used to estimate...
Modelling groundwater flow and transport contaminant require heterogeneous parameters such as hydraulic conductivity, dispersivity and porosity which commonly are only sparsely available, if at all. State variables such as hydraulic head and concentration are generally more extensively sampled and can be assimilated to improve the characterization...
Adsorption parameters used in the modeling of reactive solute transport are usually inferred from laboratory tests such as batch adsorption tests. Experimental data of adsorbed solute, S, and equilibrium concentration, Ce, are measured and then used to infer coefficients that control the adsorption through adsorption isotherm models using fitting t...
The use of deterministic approaches that consider hydraulic conductivity (K) as a constant value for an entire soil layer are usually employed in numerical modeling in geotechnical engineering. However, K can present high spatial variability and its heterogeneity is important even in apparently homogeneous soils. Due to this heterogeneity K present...
Spatial variation of the correlation among variables related to water flow and solute transport are important in the characterization of the spatial variability when performing uncertainty analysis and making uncertainty-qualified solute transport predictions. However, the spatial variation of the correlation between solute transport parameters and...
Although important for many geotechnical issues, hydraulic conductivity heterogeneity is rarely considered in geotechnical practice for two main issues. First, it is almost impossible to sample the entire area of interest. Second, it is very difficult to account for scale effects in our numerical models. In this paper, we divulgated an important re...
Stochastic upscaling of flow and reactive solute transport in a tropical soil is performed using real data collected in the laboratory. Upscaling of hydraulic conductivity, longitudinal hydrodynamic dispersion, and retardation factor were done using three different approaches of varying complexity. How uncertainty propagates after upscaling was als...
The retardation factor (Rd) is one of the main important solute transport parameters. Its value can vary significantly depending on the method used for its determination. In this paper, the sodium Rd is experimentally determined using undisturbed sandy soil columns to compare four methods of Rd determination and assess the impact of the chosen meth...
Infiltration in rectangular ditches is a simple, fast and cheap method to estimate hydraulic conductivity in large scale, reducing problems related to the scale effect on it. However, the necessity to the soil saturation before the test increasing its time and cost. The aim of this paper is to investigate numerically the influence of the previous s...
Infiltration in rectangular ditches is a simple, fast and cheap method to estimate hydraulic conductivity in large scale, reducing problems related to the scale effect on it. However, the necessity to the soil saturation before the test increasing its time and cost. The aim of this paper is to investigate numerically the influence of the previous s...
Hydraulic conductivity (K), dispersivity (α) and partition coefficient (Kd) can change according to the measurement support (scale) and that is referred as scale effect. However, there is no clear consensus about the scale behavior of these parameters. Comparison between results obtained in different support of measurements in the field and in the...
Hydraulic conductivity (K) heterogeneity is seldom considered in geotechnical practice for the impossibility of sampling the entire area of interest and for the difficulty of accounting for scale effects. Stochastic three-dimensional K upscaling can tackle these two problems, and a workflow is described with an application in a tropical soil. The a...
Column tests using undisturbed samples of residual sandy soil from the Adamantina Formation (K) were performed to determine the sodium hydrodynamic coefficient by equilibrium and non-equilibrium methods. Analyzing the porosity and soil characteristics, as well as the breakthrough curves, it was possible to note a typical non-equilibrium transport b...
A heterogeneidade da condutividade hidráulica (K) é bastante relevante para o transporte de massa, mas normalmente ela é desconsiderada e o meio é adotado como homogêneo. Neste trabalho, a caracterização da heterogeneidade da K é avaliada por meio do seu impacto no transporte de potássio (K +). A variabilidade espacial da K foi estudada por meio de...
Este artigo mostra um exemplo de aplicação da estimativa da probabilidade de um contaminante exceder uma máxima concentração especificada (probabilidade de excedência, Pf), usando métodos de confiabilidade de primeira (FORM) e segunda ordem (SORM) para diversas concentrações iniciais de um soluto hipotético, sem biodegradação e tempos de análise de...
The study of the soil hydraulic conductivity (K) is useful for a wide range of research areas as mining, geotechnical engineering, solute migration, groundwater remediation and others. Its determination can be made by indirect methods as the correlation with porosity values and granulometric curve, but also directly in the field by means of double...
This paper presents a brief study of the impact of the spatial variability of the hydraulic conductivity on the response of a soil mass before a range of dewatering demands. Spatial variability of the soil mass was characterized and handled using geostatistical tools and the inference of the spatial distribution of the hydraulic conductivity was pe...
Determination of solute transport parameter is fundamental in numerical modelling and estimation of contaminant movement in the soil. Usually the transport parameters are obtained in laboratory by columns tests in disturbed samples. However, disturbed samples may not accurately reflect real situations that are subjected to the presence of natural i...
El propósito de este estudio fue calcular el factor de retardo del amonio por medio de isotermas de sorción obtenidas a partir de los resultados de ensayos laboratoriales en columnas no perturbadas de suelo arenoso. Esta investigación fue desarrollada en siete etapas: 1) caracterización física, química y físico-química del suelo; 2) ensayo de perco...
Wastewater from treatment of domestic sewage is being increasingly used in agricultural irrigation, and can generate many problems related to high sodium concentration. Thus, it is necessary to know the behavior of Na+ to perform more sustainable wastewater reuse in agricultural irrigation. In this sense, this research aimed to study the transport...
Resumo: Um dos principais parâmetros utilizados no determinação do transporte de solutos é o coeficiente de dispersão hidrodinâmica longitudinal (Dh). O Dh pode ser obtidos por meio de diferentes métodos que influenciam a previsão do transporte. Neste sentido, este trabalho teve como objetivo principal avaliar o impacto do Dh na modelagem numérica...
Introdução Um dos principais parâmetros utilizados na determinação do transporte de solutos em meios porosos é o coeficiente de dispersão hidrodinâmica longitudinal (D h). O D h pode ser obtido por meio de diferentes métodos que influenciam a previsão do transporte. Objetivo Neste sentido, este trabalho teve como objetivo principal avaliar o impact...
RESUMO: Efluentes de esgotos domésticos são utilizados na irrigação de terras agrícolas, mas possuem altas concentrações de sódio, Na + , que podem alterar a condutividade hidráulica, taxa de infiltração, salinização e retenção de água no solo. Assim, o estudo dos mecanismos de transporte do Na + é de fundamental importância para que assim possa ha...
This paper presents an application example of the calculation of the probability of exceedance through a probabilistic analysis of the one-dimensional contaminant transport in saturated porous media via Monte Carlo Simulation (MCS) to several initial concentration of a hypothetical miscible solute. The maximum acceptable probability of exceedance w...
This research aimed to study the transport mechanisms of sodium, phosphate and ammonium in undisturbed columns of unconsolidated residual material of the sandstones from the Adamantina Formation. At field, visual and tactile characterization of the material were performed as well as hydraulic conductivity tests . At laboratory, there were made colu...
Resumo: Apesar de as aguas subterrâneas possuirem grande importância estrategica, vem sofrendo varias pressoes em decorrencia do aumento da quantidade de areas contaminadas por atividades industriais, urbanas e agricolas. Com isso, e urgente um gerenciamento que leve em consideracao tanto a probabilidade de ser identificada uma concentracao superio...
Resumo: A agua subterrânea e um recurso natural de extrema importância, mas vem sendo contaminada por diversas atividades, como por exemplo, os postos de combustiveis. Para lidar com essa contaminacao a CETESB desenvolve desde a decada de 90 procedimentos para o gerenciamento de areas contaminadas. Entretanto, o que se verifica e que as etapas fina...
Projects
Projects (2)
InTheMED is a project aimed at providing the most innovative decision support system tools to be demonstrated and applied in selected case studies around the Mediterranean; a project also aimed at fostering the sharing of data, methods and results, making sharing the rule rather than the exception. Tools solidly founded in the most advanced system-process and socio-economic models, and the participatory involvement of all stakeholders, from water authorities to end users, from hydrogeology experts to total system analysts.
