Analytical solutions are widely used as screening tools for estimating the potential for contaminant transport in groundwater, or for interpreting tracer tests or groundwater quality data. A solution for three-dimensional solute migration from a plane-source source that is frequently used in practice is the approximate solution of Domenico [J. Hydrol. 91 (1987) 49-58]. A more rigorous solution ...

Few studies have demonstrated changes in community structure along a contaminant plume in terms of phylogenetic, functional, and geochemical changes, and such studies are essential to understand how a microbial ecosystem responds to perturbations. Clonal libraries of multiple genes (SSU rDNA, nirK, nirS, amoA, pmoA, and dsrAB) were analyzed from groundwater samples (n = 6) that varied in contam...

ABSTRACT Improper design and management of the cover layer a sanitary landfill has been proven to produce harmful environmental impacts on environment. One alternative at hand is develop scenarios based simulation physical computational models represent expected field water balance coverage layer. This paper investigates final in municipality Seropédica, which located state Rio de Janeiro - Bra...

The presence of chlorinated solvents polluting groundwater in urbanized areas poses a significant environmental issue. This paper details thoughtful approach to remediate tetrachloroethylene (PCE) plume district that is characterized by complex hydrological context with limited accessibility. Through geodatabase-driven and coupled hydrogeochemical approach, two distinct remediation technologies...

In-situ bioremediation is a process by which contaminants in subsurface environments are biologically eliminated or mineralized; however, it is often difficult to implement. Microbes sparsely distributed in deep soils are incapable of degrading a chemical rapidly; furthermore, fine-pore structures of soils tend to retard the penetration and propagation of these microbes and to hinder oxygen tra...

The forward Fractional Advection Dispersion Equation (FADE) provides a useful model for non-Fickian transport in heterogeneous porous media. The space FADE captures the long leading tail, skewness, and fast spreading typically seen in concentration profiles from field data. This paper develops the corresponding backward FADE model, to identify source location and release time. The backward meth...

introduction air pollution has harmful effect on human health and the environment. accordingly, considerable effort has been put to analyze the air pollutants. one important issue is the spatial distribution of these pollutants. dispersion of the pollutants released from sources on the ground is mostly driven by the planetary boundary layer where turbulent flow causes mixing of the content of t...

Recovering the past movement of a contaminant plume from measurements its current values is challenging problem in hydrology. Moreover, modeling backwards an ill-posed due to unstable and non-unique nature resulting solution. Therefore, standard numerical methods become unstable, making it impossible simulate existing transport models with reversed time. This paper presents two major contributi...