Numerical modeling of the radionuclide water pathway with HYDRUS and comparison with the IAEA model of SR 44

Merk, Rainer

doi:10.1016/j.jenvrad.2011.10.014

Cited by 17 publications

(11 citation statements)

References 14 publications

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“…The types of applications are very broad, ranging between agricultural problems evaluating different irrigation schemes, the effects of plants on the soil water balance and groundwater recharge (see Agricultural Applications section below), to many environmental applications simulating the transport of different solutes and particle‐like substances (see Transport of Particle‐Like Substances section) as well as evaluating the effects of land use and environmental changes. While many early applications focused mostly on subsurface flow processes, the relatively general formulation of the transport and reaction terms in the HYDRUS models makes it possible to simulate the fate and transport of many different solutes including nonadsorbing tracers, radionuclides (e.g., Pontedeiro et al, 2010; Matisoff et al, 2011; Merk, 2012; Xie et al, 2013), mineral N species (e.g., Li et al, 2015), pesticides (Pot et al, 2005; Dousset et al, 2007; Köhne et al, 2009b), chlorinated aliphatic hydrocarbons (e.g., Kasaraneni et al, 2014; Ngo et al, 2014), hormones (e.g., Casey et al, 2005; Arnon et al, 2008; Chen et al, 2013), antibiotics (e.g., Wehrhan et al, 2007; Unold et al, 2009; Chu et al, 2013; Engelhardt et al, 2015), explosives and propellants (e.g., Dontsova et al, 2006, 2009; Alavi et al, 2011), as well as many particle‐like substances such as viruses, colloids, bacteria, nanoparticles, and carbon nanotubes (see Transport of Particle‐Like Substances section).…”

Section: Selected Hydrus Applicationsmentioning

confidence: 99%

Recent Developments and Applications of the HYDRUS Computer Software Packages

Šimůnek

Genuchten

Šejna³

2016

Vadose Zone Journal

722

336

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The HYDRUS-1D and HYDRUS (2D/3D) computer software packages are widely used finite-element models for simulating the one-and two-or three-dimensional movement of water, heat, and multiple solutes in variably saturated media, respectively. In 2008, Šimůnek et al. (2008b) described the entire history of the development of the various HYDRUS programs and related models and tools such as STANMOD, RETC, ROSETTA, UNSODA, UNSATCHEM, HP1, and others. The objective of this manuscript is to review selected capabilities of HYDRUS that have been implemented since 2008. Our review is not limited to listing additional processes that were implemented in the standard computational modules, but also describes many new standard and nonstandard specialized add-on modules that significantly expanded the capabilities of the two software packages. We also review additional capabilities that have been incorporated into the graphical user interface (GUI) that supports the use of HYDRUS (2D/3D). Another objective of this manuscript is to review selected applications of the HYDRUS models such as evaluation of various irrigation schemes, evaluation of the effects of plant water uptake on groundwater recharge, assessing the transport of particle-like substances in the subsurface, and using the models in conjunction with various geophysical methods.Abbreviations: CRS, cosmic-ray sensing; EC, electrical conductivity; ERT, electrical resistivity tomography; FEM, finite element mesh; GPR, ground-penetrating radar; GUI, graphical user interface; TDT, time-domain transmissometry.The HYDRUS-1D and HYDRUS (2D/3D) software packages (Šimůnek et al., 2008b) are finite-element models for simulating the one-and two-or three-dimensional movement of water, heat, and multiple solutes in variably saturated media, respectively. The standard versions, as well as various specialized add-on modules, of the HYDRUS programs numerically solve the Richards equation for saturated-unsaturated water flow and convection-dispersion type equations for heat and solute transport. The flow equation incorporates a sink term to account for water uptake by plant roots as a function of water and salinity stress. Both compensated and uncompensated water uptake by roots can be considered. The heat transport equation considers movement by both conduction and convection with flowing water. The governing convection-dispersion solute transport equations are written in a relatively general form by including provisions for nonlinear, nonequilibrium reactions between the solid and liquid phases and linear equilibrium reactions between the liquid and gaseous phases. The transport models also account for convection and dispersion in the liquid phase as well as diffusion in the gas phase, thus permitting the models to simulate solute transport simultaneously in both the liquid and gaseous phases. Hence, both adsorbed and volatile solutes, such as pesticides and fumigants, can be considered.The solute transport equations further incorporate the effects of zero-order production, first-o...

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Section: Selected Hydrus Applicationsmentioning

confidence: 99%

Recent Developments and Applications of the HYDRUS Computer Software Packages

Šimůnek

Genuchten

Šejna³

2016

Vadose Zone Journal

722

336

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“…The modeling as well as experimental studies in field scale also discussed earlier on the migration of radionuclide in large vadose zone thickness [35][36][37]. Moreover, the transport behavior of uranium from the tailing pond has extremely affected under various soil types such as sand, silt, clay, sediments and sandstone [19,20,23,24].…”

Section: Introductionmentioning

confidence: 83%

“…The water content (θ w ), pressure head (h) and hydraulic conductivity (K) are highly correlated in the unsaturated case. The hydraulic conductivity in unsaturated porous medium is not only depends on the matrix material but also on the local pressure head [24]. Widely acknowledged empirical relationships were arrived by van Genuchten [41] and described in Eq.…”

Section: Physical System and Governing Equationsmentioning

confidence: 99%

“…Qian et al [23] simulated the vertical transport of Sr 90 in the unsaturated Chinese loess under artificial rain conditions. Merk [24] studied the radionuclide transport from the concrete rubble when the radionuclide dissolves in the infiltrated water using HYDRUS-1D. Sanchez and Thorne [25] presented a mathematical model to study the behavior of U 238 series radionuclide entering soils in solution and their uptake by plants along with the decay chain of uranium in soil-plant system under different hydrological regimes.…”

Section: Introductionmentioning

confidence: 99%

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Modeling the sensitivity of hydrogeological parameters associated with leaching of uranium transport in an unsaturated porous medium

Berlin

Govindarajan

2018

Environmental Engineering Research

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The uranium ore residues from the legacies of past uranium mining and milling activities that resulted from the less stringent environmental standards along with the uranium residues from the existing nuclear power plants continue to be a cause of concern as the final uranium residues are not made safe from radiological and general safety point of view. The deposition of uranium in ponds increases the risk of groundwater getting contaminated as these residues essentially leach through the upper unsaturated geological formation. In this context, a numerical model has been developed in order to forecast the 238 U and its progenies concentration in an unsaturated soil. The developed numerical model is implemented in a hypothetical uranium tailing pond consisting of sandy soil and silty soil types. The numerical results show that the 238 U and its progenies are migrating up to the depth of 90 m and 800 m after 10 y in silty and sandy soil, respectively. Essentially, silt may reduce the risk of contamination in the groundwater for longer time span and at the deeper depths. In general, a coupled effect of sorption and hydro-geological parameters (soil type, moisture context and hydraulic conductivity) decides the resultant uranium transport in subsurface environment.

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“…In this model, the retardation properties of the engineered layers and argillaceous sediments are described by the so-called distribution coefficient K d . Such a model has been applied in similar studies, both in Bulgaria (Stoyanov, 2012(Stoyanov, , 2019Kotsev et al, 2018) and elsewhere (e.g., Robinson and Bussod, 2000;Mallants et al, 2001Mallants et al, , 2011Šimůnek et al, 2006;Merk, 2012).…”

Section: Formulation Of the Mass Transport Modelmentioning

confidence: 99%

Preliminary modelling of radionuclide migration in the argillaceous sediments of the Sumer Formation (Northwestern Bulgaria)

Antonov

Tsvetkova

Karastanev

2020

Geologica Balcanica

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In Bulgaria, from the preliminary analyses performed for site selection of deep geological disposal of high-level waste (HLW) and spent fuel (SF), it was concluded that the most promising host rocks are the argillaceous sediments of the Sumer Formation (Lower Cretaceous), situated in the Western Fore-Balkan Mts. The present paper aims to compare the transport of three major radionuclides from a hypothetical radioactive waste disposal facility, which incorporates an engineering barrier of bentonite into the argillaceous (marl) medium. The simulations were performed by using HYDRUS-1D computer programme. The results are used for a preliminary estimation of argillaceous sediments as a host rock for geological disposal of HLW.

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Numerical modeling of the radionuclide water pathway with HYDRUS and comparison with the IAEA model of SR 44

Cited by 17 publications

References 14 publications

Recent Developments and Applications of the HYDRUS Computer Software Packages

Recent Developments and Applications of the HYDRUS Computer Software Packages

Modeling the sensitivity of hydrogeological parameters associated with leaching of uranium transport in an unsaturated porous medium

Preliminary modelling of radionuclide migration in the argillaceous sediments of the Sumer Formation (Northwestern Bulgaria)

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