Numerical analysis of water and solute transport in variably-saturated fractured clayey till

Rosenbom, Annette E.; Therrien, René; Refsgaard, Jens Christian; Jensen, Karsten H.; Ernstsen, Vibeke; Klint, Knud Erik S.

doi:10.1016/j.jconhyd.2008.09.001

Cited by 36 publications

(33 citation statements)

References 36 publications

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“…Monitoring began at the Tylstrup, Jyndevad and Faardrup fields in 1999 and at the Silstrup and Estrup fields in 2000 (Table 1). The three loamy fields are characterized by preferential transport through macropores (biopores, fractures) in a low permeable soil matrix (Rosenbom et al, 2009b), while other forms of preferential transport in the soil matrix may be found in the sandy fields (Rosenbom et al, 2009a). These hydraulic conditions result in groundwater table fluctuations exceeding 2.5 m in the loamy fields and being less than 2 m in the sandy fields.…”

Section: Selection Of the Five Fieldsmentioning

confidence: 99%

“…It is well documented (Aschonitis and Antonopoulos, 2013) that the effective porosity in loamy soil corresponding to connected discontinuities, such as wormholes and fractures, is low compared to that of sandy soil, with the result that climatic conditions have a greater impact on the pore system. The consequences are: (i) immediate response to a precipitation or snowmelt event causing rapid flow and transport through discontinuities (Rosenbom et al, 2008(Rosenbom et al, , 2009bVryzas et al, 2012), which may sometimes be directly connected to drains (Nielsen, 2010); and (ii) seasonal fluctuations of up to 4 m in the groundwater table with resultant drainage, primarily in periods when the groundwater table is located above the drains (above 1.1e1.2 m b.g.s.). This very dynamic hydrogeological setting enables a larger variety of pesticides and their degradation products to reach groundwater in intense pulses, before being diluted or retarded to varying degrees.…”

Section: Impact Of Fate Processes and Hydrogeological Setting On Leacmentioning

confidence: 99%

See 1 more Smart Citation

Pesticide leaching through sandy and loamy fields – Long-term lessons learnt from the Danish Pesticide Leaching Assessment Programme

Rosenbom

Olsen

Plauborg

et al. 2015

Environmental Pollution

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Section: Selection Of the Five Fieldsmentioning

confidence: 99%

Section: Impact Of Fate Processes and Hydrogeological Setting On Leacmentioning

confidence: 99%

Pesticide leaching through sandy and loamy fields – Long-term lessons learnt from the Danish Pesticide Leaching Assessment Programme

Rosenbom

Olsen

Plauborg

et al. 2015

Environmental Pollution

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“…The flow velocities in the discontinuities are determined by the commonly used cubic law [7]. Retention and relative permeability curves for both the fractures and the matrix can be expressed from van Genuchten's function [8] or can be specified in a tabular form. In the model, the porous medium is discretized with 3D finite elements and fractures are discretized with 2D finite elements.…”

Section: Hydro-geosphere Codementioning

confidence: 99%

Numerical simulations of water flow and contaminants transport near mining wastes disposed in a fractured rock mass

Abdelghani¹,

Aubertin

Simon

et al. 2015

International Journal of Mining Science and Technology

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a b s t r a c tA numerical tool, called Hydro-Geosphere, was used to simulate unsaturated water flow and contaminants migration around an open pit filled with mining wastes. Numerical simulations had been carried out to assess the influence of various factors on water flow and solute transport in and around the surface openings including recharge, properties of the waste material and presence of fractures in the surrounding rock mass. The effect of the regional hydraulic gradient was also investigated. The analyses were conducted by simulating various 2D cases using experimentally obtained material properties and controlled boundary conditions. The effects of the hydrogeological properties of the filling material (i.e., water retention curve and hydraulic conductivity function), fracture network characteristics and conductivity of the joints were assessed. The results illustrate that fractures control water flow and contaminants transport around the waste disposal area. A fracture network can desaturate the system and improve the regional gradient effect.

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“…The applied HydroGeoSphere model (Therrien et al, 2006) is a non-commercial code available to the interested user under http://hydrogeosphere.org/. The model has been extensively used for various studies involving dual porosities such as Mclaren et al (2000), Rosenbom et al (2009) and Schwartz et al (2010). The governing equation in the applied model is the Richards equation (Richards, 1931), which is slightly modified to account for inter-continuum water exchange:…”

Section: Modeling Approachmentioning

confidence: 99%

Simulation of saturated and unsaturated flow in karst systems at catchment scale using a double continuum approach

Kordilla

Sauter

Reimann

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. The objective of this work is the simulation of saturated and unsaturated flow in a karstified aquifer using a double continuum approach. The HydroGeoSphere code (Therrien et al., 2006) is employed to simulate spring discharge with the Richards equations and van Genuchten parameters to represent flow in the (1) fractured matrix and (2) conduit continuum coupled by a linear exchange term. Rapid vertical small-scale flow processes in the unsaturated conduit continuum are accounted for by applying recharge boundary conditions at the bottom of the saturated model domain. An extensive sensitivity analysis is performed on single parameters as well as parameter combinations. The transient hydraulic response of the karst spring is strongly controlled by the matrix porosity as well as the van Genuchten parameters of the unsaturated matrix, which determine the head dependent inter-continuum water transfer when the conduits are draining the matrix. Sensitivities of parameter combinations partially reveal a non-linear dependence over the parameter space. This can be observed for parameters not belonging to the same continuum as well as combinations, which involve the exchange parameter, showing that results of the double continuum model may depict a certain degree of ambiguity. The application of van Genuchten parameters for simulation of unsaturated flow in karst systems is critically discussed.

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Numerical analysis of water and solute transport in variably-saturated fractured clayey till

Cited by 36 publications

References 36 publications

Pesticide leaching through sandy and loamy fields – Long-term lessons learnt from the Danish Pesticide Leaching Assessment Programme

Pesticide leaching through sandy and loamy fields – Long-term lessons learnt from the Danish Pesticide Leaching Assessment Programme

Numerical simulations of water flow and contaminants transport near mining wastes disposed in a fractured rock mass

Simulation of saturated and unsaturated flow in karst systems at catchment scale using a double continuum approach

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