Numerical modelling on fate and transport of nitrate in an unsaturated system under non-isothermal condition

Berlin, M.; Kumar, G. Suresh; Nambi, Indumathi M.

doi:10.1080/19648189.2013.788984

Cited by 18 publications

(8 citation statements)

References 39 publications

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“…This temperature variation can affect the biological activity (nitrification and denitrification) and further affect the concentration of nitrogen species (Saadi and Maslouhi 2003;Berlin et al 2013). Since, current study focuses more on biological clogging; the authors have assumed that the unsaturated domain can be treated under isothermal conditions.…”

Section: Physical System and Model Formulationmentioning

confidence: 99%

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Numerical modeling of biological clogging on transport of nitrate in an unsaturated porous media

2014

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In order to better understand nitrogen species transport and transformation in the saturated zone, it is essential to predict the contaminant concentration in the unsaturated zone as the concentration profiles estimated from unsaturated zone forms as the input for estimation of contaminant concentration in the saturated zone. Since the nitrogen transformations occur in the presence of bacteria, there is a need to account the influence of biological clogging to develop comprehensive model of nitrogen species transport. In this study, a one-dimensional numerical model is developed to investigate the nitrogen species transport in an unsaturated porous media along with microbial clogging process. Results suggest that hydraulic conductivity is enhanced initially due to increase in the water content followed by a significant reduction at larger simulation time resulting from bioclogging. As bioclogging mitigates the hydraulic conductivity significantly, a considerable delay is observed in the ammonium nitrogen and nitrate nitrogen transport with reference to the system without bioclogging. In addition, the effect of oxygen mass transfer coefficient on biological clogging was evaluated. Numerical results suggest that as the oxygen mass transfer is decreased the ammonium nitrogen and nitrate nitrogen concentration travels a larger depth. Further numerical results strongly suggest that nitrogen species transport in the unsaturated zone is significantly affected by the presence of biological clogging.

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Section: Physical System and Model Formulationmentioning

confidence: 99%

“…The reduction and transport of various nitrogen species in unsaturated zone are affected by nitrate input, volumetric water content, depth of water table, pH, temperature, microbial activity (Huang et al 2012). Berlin et al (2013) studied the fate and transport of nitrate in an unsaturated system under non-isothermal condition.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of biological clogging on transport of nitrate in an unsaturated porous media

2014

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“…connected to tile drains, for instance, may be most important in terms of the rapid movement of land-surface-derived contaminants to subsurface water flow systems (e.g., tile drains) (Fleming and Bradshaw, 1992;Fox et al, 2004;Akay and Fox, 2007;Frey et al, 2016). A substantial body of literature has been produced regarding N transformations and transport in agricultural soils (i.e., Lee et al, 2006;Berlin et al, 2013Berlin et al, , 2014aLi et al, 2015). And while some studies have characterized or modeled macropore connectivity in soil in the context of flow (Akay et al, 2008;Klaus and Zehe, 2010), there is a need to elucidate dynamic chemical transformations and transport in soil macropores under various degrees of macropore connectivity (Jarvis et al, 2017).…”

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confidence: 99%

Reactive Transport of Manure‐Derived Nitrogen in the Vadose Zone: Consideration of Macropore Connectivity to Subsurface Receptors

Hussain

Frey

Blowes

et al. 2019

Vadose Zone Journal

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Core Ideas Manure N transformation was modeled with different soil pore connectivities to tile drains. Macropores facilitated NH4+ oxidation reaction products deeper in the profile. Nitrate losses to tile were best predicted by models using pores connected to tile drains. Macropores can be important conduits for surface‐derived nutrients to reach subsurface receptors. Accordingly, nutrient reactive transport processes in macroporous soils need to be well understood. In this study, steady‐state two‐dimensional reactive transport simulations with MIN3P‐THCm (version 1.0.519.0) were used to elucidate how soil macropore connectivity to tile drains can influence N transformations following liquid swine manure (LSM) applications to soil. Four different soil scenarios were considered: homogeneous sand, homogeneous clay loam, and clay loam with discrete macropores connected to or disconnected from the bottom boundary used to represent tile drain outflow. In relation to the homogeneous soils, macropores, overall, facilitated chemical diffusion into the adjacent soil matrix along their length and broadly augmented O2 ingress into the soil profile. These processes combined to critically control the spatial distribution of NH4+ oxidation reaction products. When used in transient simulation mode with field data observed at experimental tile‐drained plots that received LSM application, the model showed that simulated nitrate mass losses to tile are considerably higher and most realistic under the connected macropore scenario compared with the homogeneous or disconnected macropore scenarios.

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“…Vadose zone thickness can extend several meters and the soil hydraulic parameters are nonlinear [27][28][29][30][31]. Few studies indicated the vadose zone thickness can extend up to 50 m [32].…”

Section: Introductionmentioning

confidence: 99%

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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Numerical modelling on fate and transport of nitrate in an unsaturated system under non-isothermal condition

Cited by 18 publications

References 39 publications

Numerical modeling of biological clogging on transport of nitrate in an unsaturated porous media

Numerical modeling of biological clogging on transport of nitrate in an unsaturated porous media

Reactive Transport of Manure‐Derived Nitrogen in the Vadose Zone: Consideration of Macropore Connectivity to Subsurface Receptors

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

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