Unsaturated zone leaching models for assessing risk to groundwater of contaminated sites

Troldborg, Mads; Binning, Philip John; Nielsen, Susanne Balslev; Kjeldsen, Peter; Christensen, Anders Lyhne

doi:10.1016/j.jconhyd.2008.11.002

Cited by 34 publications

(37 citation statements)

References 25 publications

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“…Jury, 1982;Jury et al, 1990). More recently, analytical solutions have been derived for combined gas and water phase contaminant transport (Troldborg et al, 2009) and transport in low permeability fractured media (Chambon et al, 2011). Related to transfer function theory are mixing-cell models, in which solute transport is simulated by a series of mixing cells with predetermined volumes that depend on the dispersivity of the porous medium (cf.…”

Section: Introductionmentioning

confidence: 99%

Dual-tracer, non-equilibrium mixing cell modelling and uncertainty analysis for unsaturated bromide and chloride transport

Wöhling

Bidwell²,

Barkle

2012

Journal of Contaminant Hydrology

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Section: Introductionmentioning

confidence: 99%

Dual-tracer, non-equilibrium mixing cell modelling and uncertainty analysis for unsaturated bromide and chloride transport

Wöhling

Bidwell²,

Barkle

2012

Journal of Contaminant Hydrology

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“…From approximately 30 days of simulation (Figure c), the relative salt concentration continued to decrease, and dispersivities increase linearly with transport distances for TVD schemes. There are two mechanisms that contribute to the attenuation of concentration with time: degradation (organic contaminant) and horizontal spreading (Troldborg et al ., ). While the porosity, hydraulic conductivity and retardation parameters may appear confounded in this instance, in practice, this problem is ameliorated by the fact that the range of reasonable porosity and retardation values is relatively narrow compared with the range of possible hydraulic conductivity values.…”

Section: Resultsmentioning

confidence: 97%

Modelling of the groundwater flow and of tracer movement in the porous and fissured media: Chalk Aquifer (Northern part of Paris Basin, France)

et al. 2016

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A groundwater flow model has been developed in order to study the chalk aquifer of Paris Basin, based on most of the geological and hydrological available data. The numerical processes are intended to modelling the groundwater flow in the Senonian (Late Cretaceous) formations and to visualize the tracer movement in groundwater resources in the experimental site of LaSalle Beauvais (northern part Paris Basin). Both objectives were achieved as follows: (i) the comprehension of the spatial distribution of the hydraulic conductivity in the chalk aquifer taking into account the characteristics of the hydrogeological system and (ii) the use of the analytical solution for describing one‐dimensional to two‐dimensional solute transport in a unidirectional steady‐state flow tracer with scale‐dependent dispersion. Advection and diffusion mechanisms are taken into account. Comparison between the breakthrough curves of the analytical and the numerical solutions provided an excellent agreement for various ranges of scale‐related transport parameters of interest. The developed power series solution facilitates fast prediction of the breakthrough curves at each observation point. Thus, the derived new solutions are widely applicable and are very useful for the validation of numerical transport. The numerical approach is carried out by MT3DMS, a Modular 3‐D Multi‐Species Transport Model for Simulation of Advection, Dispersion, and Chemical Reactions of Contaminants in Groundwater Systems, and based on total variation‐diminishing method using the ULTIMATE algorithm. The estimation of the infected surface could constitute an approach in water management and allows to prevent the risks of pollution and to manage the groundwater resource from a durable development perspective. Copyright © 2016 John Wiley & Sons, Ltd.

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“…1-D and 3-D analytical models were developed to simulate steady state and transient leaching from shallow VOC sources and apply their models to site investigation data. The models included the essential processes inherent to the VOC leaching scenario: advection (water phase vertical flow), dispersion, sorption, water/air phase partitioning (volatilization), first-order degradation in the water phase [27].…”

Section: Modelling Case Studiesmentioning

confidence: 99%

A Review on Transport Modeling Of VOCs In Subsoil

Hameed¹,

M²

2014

IJIRSET

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Volatile Organic Compounds (VOCs) are the most common subsurface environment contaminants usually in the form of Non-Aqueous Phase Liquids (NAPL) through Leaking Underground Storage Tanks (LUSTs) and pipelines, accidental spills, land disposal sites, and industrial waste impoundments. VOCs are toxic, mutagenic and carcinogenic. Hence, VOCs in subsoil pose a serious threat of groundwater contamination. Organic compounds, owing to their persistence and volatility, present unique environmental problems in the vadose zone of soils. The uncertainty in transport mechanisms and subsoil environment pose a serious challenge in developing transport model for VOC compounds. Apart from advection and dispersion, VOC also undergo several complex chemical reactions such as adsorption, degradation, volatilization and ionic exchange. The transport mechanisms and transport modeling studies for VOCs are largely based on extensive field studies and relevant laboratory experiments. The focus here is to review the role of transport mechanisms and modeling aspects of organic compounds in petroleum fuels and other such liquids and liquid wastes that have the potential to migrate through subsoil to groundwater and also to atmosphere by vapor diffusion.

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Unsaturated zone leaching models for assessing risk to groundwater of contaminated sites

Cited by 34 publications

References 25 publications

Dual-tracer, non-equilibrium mixing cell modelling and uncertainty analysis for unsaturated bromide and chloride transport

Dual-tracer, non-equilibrium mixing cell modelling and uncertainty analysis for unsaturated bromide and chloride transport

Modelling of the groundwater flow and of tracer movement in the porous and fissured media: Chalk Aquifer (Northern part of Paris Basin, France)

A Review on Transport Modeling Of VOCs In Subsoil

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