Comparison of simulated water, nitrate, and bromide transport using a Hooghoudt-based and a dynamic drainage model

Mollerup, Mikkel; Abrahamsen, Per; Petersen, Claus Leth; Hansen, Søren

doi:10.1002/2012wr013318

Cited by 16 publications

(16 citation statements)

References 35 publications

(46 reference statements)

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“…In the soil matrix the water dynamics are described by Richards' equation, and the water flow by Darcy's Law. The development of the two‐dimensional version of DAISY was initiated to include water flow and solute transport to drains (Hansen et al, 2012b; Mollerup et al, 2014). Macropores may constitute a direct passage of water and solutes to the drains, and they are described by spatial density, aperture, and length.…”

Section: Methodsmentioning

confidence: 99%

Effects of Single Rainfall Events on Leaching of Glyphosate and Bentazone on Two Different Soil Types, using the DAISY Model

Rasmussen

Abrahamsen

Nielsen

et al. 2015

Vadose Zone Journal

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Core Ideas Modeling pesticide leaching during a single rainfall event with temporal variability. Short intense events (1 h) resulted in high glyphosate leaching to subsurface drains. Event volume controlled pesticide leaching at coarse sandy soil. The purpose of the present modeling study was to contribute to an improved understanding of the mechanisms involved in pesticide leaching during a single rainfall event with temporal variability. Rainfall intensity of the first event after pesticide application has great effect on the amount of pesticide transported to groundwater and subsurface drains, especially in soils containing preferential flow pathways. One way to improve the understanding of single event properties on pesticide leaching is to use a transport model. The soil–plant–atmosphere model Daisy was used to simulate pesticide leaching during and after single rainfall events of different durations and intensities. Designed temporally variable single rainfall events based on the Chicago Design Rain were inserted in the original weather file. A combination of different intensities (13, 20, 24, 28, 34, and 39 mm h−1) at different event durations (1, 3, 5, and 9 h) where the intensity peak was placed in the middle of the event ware applied, resulting in 24 different design events. The model setup included two different soil types: a coarse sandy soil and a sandy loam containing macropores and subsurface drains. The fates of the herbicides bentazone [3‐isopropyl‐1H‐2,1,3‐benzothiadiazin‐4(3H)‐one 2,2‐dioxide] and glyphosate [N‐(phosphonomethyl)glycine] were simulated. The leaching dynamics of both pesticides showed high variability at the hourly level, illustrating the importance of high model resolution when estimating pesticide leaching. For the coarse sandy soil different intensities did not appear to have an effect, as pesticide leaching was controlled by event volume. In contrast, results for the sandy loam showed an effect of intensity, especially for glyphosate, at initially wet soil conditions. Short intense events (1 h) resulted in high leaching to drains (1.7% of matrix infiltration) compared to events of longer duration (up to 0.4% of matrix infiltration). This indicates that it might be more prudent to view leaching as a risk that occurs under certain conditions, rather than something that can be averaged.

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Section: Methodsmentioning

confidence: 99%

Effects of Single Rainfall Events on Leaching of Glyphosate and Bentazone on Two Different Soil Types, using the DAISY Model

Rasmussen

Abrahamsen

Nielsen

et al. 2015

Vadose Zone Journal

Self Cite

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“…The latter perception is rooted in the low sorption affinity of Br − for anionic mineral surfaces, 1 a characteristic which, along with its solubility and general scarcity, makes Br − useful as a tracer in soil hydrology. 2–4 While Br − may not be prone to adsorption, it does appear reactive towards terrestrial organic matter; recent studies have demonstrated fractionation of Br into organic and inorganic pools in lakes, 5–7 peat bogs, 8 and forest soil. 9 …”

Section: Introductionmentioning

confidence: 99%

Abiotic Bromination of Soil Organic Matter

Leri

Ravel

2015

Environ. Sci. Technol.

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Biogeochemical transformations of plant-derived soil organic matter (SOM) involve complex abiotic and microbially mediated reactions. One such reaction is halogenation, which occurs naturally in the soil environment and has been associated with enzymatic activity of decomposer organisms. Building on a recent finding that naturally produced organobromine is ubiquitous in SOM, we hypothesized that inorganic bromide could be subject to abiotic oxidations resulting in bromination of SOM. Through lab-based degradation treatments of plant material and soil humus, we have shown that abiotic bromination of particulate organic matter occurs in the presence of a range of inorganic oxidants, including hydrogen peroxide and assorted forms of ferric iron, producing both aliphatic and aromatic forms of organobromine. Bromination of oak and pine litter is limited primarily by bromide concentration. Fresh plant material is more susceptible to bromination than decayed litter and soil humus, due to a labile pool of mainly aliphatic compounds that break down during early stages of SOM formation. As the first evidence of abiotic bromination of particulate SOM, this study identifies a mechanistic source of the natural organobromine in humic substances and the soil organic horizon. Formation of organobromine through oxidative treatments of plant material also provides insights into the relative stability of aromatic and aliphatic components of SOM.

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“…from the matrix to biopores and vice versa. For further description of solute movement in the matrix, to crops and drains see Hansen et al (2012) and Mollerup et al (2014), respectively.…”

Section: 1029/2020wr027954mentioning

confidence: 99%

A Physically Based Model for Preferential Water Flow and Solute Transport in Drained Agricultural Fields

Holbak

Abrahamsen

Hansen

et al. 2021

Water Resources Research

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Consequently, some of the agrochemicals can bypass the soil matrix and its capacity to store, absorb, and transform the solute. Thus, agrochemicals and nutrients can be carried to great depths, where degradation is limited (Boesten et al., 2000), possibly increasing the total amounts leached to groundwater. The preferential processes usually take place in what is often called macropores (Beven and Germann, 1982, 2013; Jarvis, 2007). In the literature, the term macropores is arbitrarily used for soil structural components like cracks, fissures, root channels, and earthworm borrows (Beven and German, 1982, 2013). These generally occur in soils with well-developed structures, that is, soils with silt or clay texture (Beven, 2018; Jarvis, 2007). Jarvis (2007) distinguishes between biologically induced macropores (e.g., root channels and earthworm borrows) termed biopores and macropores as a result of soil aggregation (e.g., fissures and cracks). In this work, the term biopores will be used to describe root channels, and earthworm borrows in which capillary effects are negligible. Artificial drainage is a common agricultural practice, which allows a field to be cultivated and increases crop production, but simultaneously can create new pathways for leaching of nutrients and agrochemicals to surface water (

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Comparison of simulated water, nitrate, and bromide transport using a Hooghoudt-based and a dynamic drainage model

Cited by 16 publications

References 35 publications

Effects of Single Rainfall Events on Leaching of Glyphosate and Bentazone on Two Different Soil Types, using the DAISY Model

Effects of Single Rainfall Events on Leaching of Glyphosate and Bentazone on Two Different Soil Types, using the DAISY Model

Abiotic Bromination of Soil Organic Matter

A Physically Based Model for Preferential Water Flow and Solute Transport in Drained Agricultural Fields

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